vd calculation

SECTION-9 ELECTRICAL DESIGN CALCULATION

507

TRANSFORMER SIZING FOR CWPS PLANT

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

L. F.

= Load Factor

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

P. F.

= Motor Power Factor

2.0

Item Description

Pump

Connected Load

Rating in kW

Effi.

280

0.946

P. F.

L. F.

0.85

D. F.

0.9

1

=

4.0 System P. F. = 5.0 Calculation to check the starting of largest size motor 5.1 Rating of transformer assumed = 5.2 % impedance of transformer assumed = 5.3 Rating of the largest size motor = 5.4 Supply voltage = 5.5 P.F of largest size motor = 5.6 Efficiency of largest size motor =

Total (kW)

3

840

2

504

626.79

504

626.79

0.8041 1250 5 280 3.3 0.85 0.946

kVA % KW kV

Nearest standard size (Confg. 33/3.3KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

60.92016454 A

Rating of largest size motor in kVA

=

348.2153961 kVA

=

348.2153961 kVA

(Considering only one motor is working and the Second motor is started)

=

2089.292377 kVA

= 6 x 1.7321 x kV x I FLC

696.4307922 kVA

= 3 x 1.7321 x kV x I FLC

5.11

Motor starting Kva with Star Delta start

=

5.12

Fault Level at transformer secondary side

=

5.13

Fault current of transformer secondary side (ISC)

=

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star Delta starting

=

5.16

752.15 kVA

=

5.10

5.15

Working Load (kVA)

Unit

FLC of motor

Base load on transformer before starting Second largest motor Motor starting Kva with DOL start

5.9

Working Load

Total (kW) 840

3.0 Considering 20% contingency

5.8

= Motor Efficiency

Unit

Total Load

5.7

= Diversity Factor

Effi. Input Data and Calculations:

Sr. No. 2.1

D. F.

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV

25 MVA 4.373741456 kA 25000 kVA

=

9.750031091 %

=

4.2 %

The selected rating of transformer is

508

1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer 1250 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS MOTOR TERMINAL Main Pumps For Clear water pumping station 1 2 3 4 5 6

Motor rating (kW) Motor rating after 90% load factor (kW) Supply Voltage (V) Motor Power Factor (p.f 1) Motor efficiency (Effi.) Power Factor to be improved (p.f 2)

7 No load p.f. (p.f NL)

280 252 3300 0.85 0.946 0.98 0.1

To be considered for further calculations Based on actual Values given by jyoti Based on actual Values given by jyoti Assumption

8 Motor Full Load Current in amp.(FLC)

54.828

= (kW x 1000) / (1.7321 x V x cos(p.f 1) x Effi.)

9 No load current in amp. (INLC)

19.190

35% of FLC

10 Motor magnetising current in amp. 11 Capacitor current (Ic) Max. kVAR that can be connected across motor 12 terminal Total kVAR to be connected across the motor 13 terminal Excess kVAR to be connected across the 14 switchgear bus bars (13 - 12)

19.094 17.184

= [ INLC x sin(cos-1p.f NL) ] Shall be 90% of motor magnetising current

98.22

= (1.7321 x V x Ic) / 1000

105.00

= kW[ tan(cos-1p.f 1) - tan(cos-1p.f 2) ]

6.79

509

Negative value indicates capacitor bank is not required across the bus.

TRANSFORMER SIZING FOR CWPS PLANT

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

L. F.

= Load Factor

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

P. F.

= Motor Power Factor

2.0

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

Input Data and Calculations:

Sr. No.

Item Description

Rating in kW

Connected Load Effi.

P. F.

L. F.

D. F.

Working Load

Unit

Total (kW)

Unit

Total (kW)

Working Load (kVA)

a

EOT crane

15

0.87

0.82

1

2

1

15

1

7.5

10.51

b c d

Exhaust fan Lighting (CWPS) Flash mixture

0.5 15 1.5

0.67 0.8 0.79

0.82 0.8 0.81

1 1 0.9

1 1.5 1

8 Lumpsum 2

4 15 3

8 Lumpsum 2

4 10 2.7

7.28 15.63 4.22

e

Clarifloculator mechanism phase-1

7.5

0.87

0.82

0.9

1

2

15

2

13.5

18.92

f

backwash pumps

160

0.962

0.86

0.9

2

2

320

1

72

87.03

g

Air blower

37

0.935

0.86

0.9

2

2

74

1

16.65

20.71

h

Chlorine booster pumps for prechlorination

1.1

0.79

0.81

0.9

2

2

2.2

1

0.495

0.77

i

Chlorine booster pumps for postchlorination

1.1

0.77

0.81

0.9

1

2

2.2

1

0.99

1.59

j

Service water pumps

3.7

0.77

0.82

0.9

1

2

7.4

1

3.33

5.27

k

Agitator for Alum dosing pump

1.5

0.79

0.81

1

2

3

4.5

3

2.25

3.52

l

Agitaotor for Lime dosing pump

1.5

0.79

0.81

1

2

3

4.5

3

2.25

3.52

m

Agitator for polyelectrolyte dosing tank

1.5

0.79

0.81

1

2

3

4.5

3

2.25

3.52

n

Dosing pump for alum

1.5

0.79

0.81

1

1

2

3

1

1.5

2.34

o

Dosing pump for lime

1.5

0.79

0.81

1

1

2

3

1

1.5

2.34

p

Dosing pump for polyelectrolyte

1.5

0.79

0.81

1

1

2

3

1

1.5

2.34

q

Valves

0.5

0.67

0.82

0.9

2

30

15

30

6.75

12.29

r

EOT crane

7.5

0.87

0.82

0.9

1

1

7.5

1

6.75

s

Lighting (chemical,Filter,pump,outdoor)

40

0.902

0.81

1

1.5

Lumpsum

40

Total Load

542.8

3.0 Considering 20% contingency

=

297.31 kVA

4.0 System P. F.

=

0.7369

5.0 Calculation to check the starting of largest size motor 5.1 Rating of transformer assumed = 5.2 = % impedance of transformer assumed 5.3 Rating of the largest size motor = 5.4 Supply voltage = 5.5 P.F of largest size motor = 5.6 Efficiency of largest size motor =

315 4.5 160 0.415 0.86 0.962

5.7 5.8

247.76

Nearest staanddard size (Confg. 33/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

269.0452946 A

Rating of largest size motor in kVA

=

193.3955422 kVA

=

121.6044578 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

=

1160.373253 kVA

= 6 x 1.7321 x kV x I FLC

386.7910845 kVA

= 3 x 1.7321 x kV x I FLC Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

5.11

Motor starting Kva with Star Delta start

=

5.12

Fault Level at transformer secondary side

=

5.13

Fault current of transformer secondary side (ISC)

=

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star Delta starting

=

5.16

182.58167

=

5.10

5.15

36.50

FLC of motor

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

5.9

kVA % KW kV

9.46

Lumpsum 26.666667

7 MVA 9.738161699 kA 7000 kVA

=

18.3139673 %

=

7.3 %

The selected rating of transformer is 400 kVA

510

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

Intermediate Pumping Station 1 Average Power factor (pf1)

0.737

2 Total Working load in IPS

210

3 Power factor To be improved (pf2)

0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

150

511

KVAR

Short circuit calculation CWPS main Pump Assumptions 1 Fault level at 220kV bus

20000 MVA

2 Base MVA

2000

Transformer Details at Chandaka220KV/132KV Ratio = 220kV / 132kV 100.00 MVA Capacity = 9.27% Z= 1 Nos Qty 8.34% Considering negative tolerance Z = 8.34% Net Z for transformers single transformer= 3 Transformer Details at Chandaka 132KV/33KV Ratio = 132kV / 33kV 40.00 MVA Capacity = 10.18% Z= 1 Nos Qty 9.16% Considering negative tolerance Z = 9.16% Net Z for transformers single transformer= 4 33kV Over head line from Chandaka to CWPS Line length = Conductor Type = Conductor Resiatance = Z,Considering Reactance Negligible =

15 DOG 0.2733 4.0995

kM Assumed ohm/kM ohm

5 Transformer at CWPS Ratio = 33kV / 3.3kV 1.25 MVA Capacity = 5.0% Z= 1 Nos Qty 4.5% Considering negative tolerance Z = 4.5% Net Z for transformers single transformer= 6

7

K' Constant for XLPE AL cable=

94

K' Constant for PVC AL cable=

75

K' Constant for PVC CU cable=

112

Fault clearing time for 33kV Breaker (t) = 1

Sec

Fault clearing time for 3.3kV Breaker (t) = 1

Sec

10

Starting Voltage dip =

11

Starting current for DOL=

6 times

12

Starting current for Y-D=

2 times

13

Starting current for FCMA softstarter=

2.5 times

15%

512

(as per IS :2026)

Calculation Sr No Description a chandaka Grid Substation

b

Impedance " Fault level Z" "MVA"

220KV Bus

0.1

220KV/132KV,100MVA transformer

1.7

1 132kV Bus

1.8

2 132kV/33kV,40MVA transformer

4.6

3 33kV Bus

6.3

Fault Current "kA"

Minimum Cable size "SQMM"

20000

52

1130.8

5

315.0

5.51

58.6

144.1

2.52

26.8

143.7

2.51

26.7

23.3

4.07

43.3 (XLPE,AL,3.3 kV)

22.8

3.98

42.4 (,AL,3.3 kV)

CWPS 1 15 kM 33kV O/H line from Chandaka Substation to CWPS

7.53

2 33kV Bus

13.88

33kV , XLPE, cable 3core x 95sqmm cable from 6 Pole 3 structure to 33KV panel 4 33kV panel 33kV , XLPE, cable 3core x 95sqmm cable from 33KV panel 5 to transformer

0.03950 13.92

0.000987

6 33kV/3.3kV, 1.25MVA transformer

72.00

7 3.3kV side of 1.25MVA transformer

86.02

3.3kV , XLPE, cable 3core x 300sqmm cable from 8 transformer secondary to CWPS PMCC

1.91

9 3.3kV CWPS PMCC Bus

87.83

513

! " #$# A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%&" '(

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 43.2978723 50 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid ground (3 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x300 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

1250 3.3 0.8 4.07 1 94 70

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 300SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 300SQmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.69 0.6555

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 218.70 FULL LOAD CURRENT/DERATING FACTOR 333.64 360 0.93

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

514

3C x300 Sqmm AL XLPE cable 0.13 0.072 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.11827365 3CX300

sq.mm Al XLPE Cable

#$# A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%&" '(

"

)

*+ "

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 42.34042553 50 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x50 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

349 3.3 0.8 3.98 1 94 40

0.76 0.722

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 35.25 FULL LOAD CURRENT/DERATING FACTOR 48.83 120 0.41

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 50 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 50 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP CABLE SIZE CHOSEN

515

= = = = = = =

3C x50 Sqmm AL XLPE cable 0.82 0.086 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

=

0.052371797

=

3.5CX50

sq.mm Al XLPE Cable

Short circuit calculation CWPS Auxilary WTP load Assumptions 1 Fault level at 220kV bus

20000 MVA

2 Base MVA

(as per IS :2026)

2000

Transformer Details at Chandaka220KV/132KV Ratio = 220kV / 132kV 100.00 MVA Capacity = 9.27% Z= 1 Nos Qty 8.34% Considering negative tolerance Z = 8.34% Net Z for transformers single transformer= 3 Transformer Details at Chandaka 132KV/33KV Ratio = 132kV / 33kV 40.00 MVA Capacity = 10.18% Z= 1 Nos Qty 9.16% Considering negative tolerance Z = 9.16% Net Z for transformers single transformer= 4 33kV Over head line from Chandaka to CWPS Line length = Conductor Type = Conductor Resiatance = Z,Considering Reactance Negligible =

15 DOG 0.2733 4.0995

kM Assumed ohm/kM ohm

5 Transformer at CWPS Ratio = 33kV / 0.415kV 0.32 MVA Capacity = 4.5% Z= 1 Nos Qty 4.1% Considering negative tolerance Z = 4.1% Net Z for transformers single transformer= 6

7

K' Constant for XLPE AL cable=

94

K' Constant for PVC AL cable=

75

K' Constant for PVC CU cable=

112

Fault clearing time for 33kV Breaker (t) = 1

Sec

Fault clearing time for 0.415kV ACB Breaker (t) = 0.08

Sec

Fault clearing time for 0.415kV MCCB Breaker (t) = 0.04

Sec

10

Starting Voltage dip =

11

Starting current for DOL=

6 times

12

Starting current for Y-D=

3.5 times

13

Starting current for FCMA softstarter=

2.5 times

15%

Formula used 1

2

Zsource =

Ztransformer =

Base MVA Fault level at 132kV bus Base MVA Transformer capacity in MVA

X tranformer Z%

3

Zline =

Base MVA kV2

X Line Z

4

Zcable =

Base MVA 2 kV

X Cable Z

516

Calculation Sr No Description a chandaka Grid Substation

Impedance " Fault level Z" "MVA"

1

220KV Bus

0.1

2

220KV/132KV,100MVA transformer

1.7

b

3 132kV Bus

1.8

4 132kV/33kV,40MVA transformer

4.6

5 33kV Bus

6.3

Fault Current "kA"

Minimum Cable size "SQMM"

20000

52

1130.8

5

315.0

5.51

144.1

2.52

26.8

7.4

10.27

30.9 (XLPE,AL,0.415kV)

6.4

8.93

26.9 (,AL,0.415 kV)

5.1

7.08

15.1 (,AL,0.415 kV)

2.4

3.39

7.2 (,AL,0.415 kV)

CWPS 1 15 kM 33kV O/H line from Chandaka Substation to CWPS

7.53

2 33kV Bus

13.88

4 33kV/0.415kV, 315KVA transformer

257.14

5 0.415kV side of 315KVA transformer

271.02

0.415kV , XLPE, cable 2 X 3.5c x 240.sqmm cable from 6 transformer secondary to CWPS PMCC

40.66

7 0.415kV CWPS AUXILARY MCC

311.68

0.415kV , XLPE, cable 2 x 3.5core x 120sqmm cable from 8 CWPS PMCC to Motor (160KW)

81.31

9 0.415kV 160KW motor (194)

392.99

0.415kV , XLPE, cable 3.5C x 240sqmm cable from CWPS 10 PMCC to WTP & Chemical

508.19

11 0.415kV WTP & Chemical

819.87

517

" A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

"

*,

-+

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 30.90207082 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable directly burried (3 cables touching)

= =

Ifl

0.69 0.6555

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x240 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

315 0.415 0.8 10.27 0.08 94 40

WORLING LOAD (KVA)/1.732 x VOLTAGE 438.24 FULL LOAD CURRENT/DERATING FACTOR 668.56 326 2.05

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 240 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 240 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

= = = = = = =

=

CABLE SIZE CHOSEN

=

518

3.5C x240 Sqmm AL XLPE cable 0.16 0.071 0.8 0.6 2 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.624055741 2X3.5CX240

sq.mm Al XLPE Cable

*, A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

-+

"

.

*

"

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR

= = =

2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

19 25 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x120 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

Ish* t/K

= = =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

194 0.415 0.8 8.93 0.04 94 40

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 155.83 FULL LOAD CURRENT/DERATING FACTOR 248.54 257 0.97

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 120SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 120 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP CABLE SIZE CHOSEN

519

= = = = = = =

3C x120 Sqmm AL XLPE cable 0.324 0.0712 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

=

0.785433685

=

2X3CX120

sq.mm Al XLPE Cable

*, A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

-+

" #/ *

"

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR

= = =

2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

19 25 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= = =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x25 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

Ish* t/K

= = =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

46 0.415 0.8 8.93 0.04 94 40

WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 36.95 FULL LOAD CURRENT/DERATING FACTOR 58.93 96 0.61

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 25SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 25 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

= = = = = = =

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

520

3C x25 Sqmm AL XLPE cable 1.54 0.0805 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.789742459 2X3CX25

sq.mm Al XLPE Cable

+ *, A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

-+

" * ,

+

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR

= = =

2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

19 25 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

45 0.95 Cable directly burried (3 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x240 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

Ish* t/K

= = =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

91 0.415 0.8 8.93 0.04 94 250

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 300 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 300Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.69 0.6555

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 126.60 FULL LOAD CURRENT/DERATING FACTOR 193.14 367 0.53

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

521

3.5C x240 Sqmm AL XLPE cable 0.128 0.0705 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.911409493 3.5CX300

sq.mm Al XLPE Cable

* , A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

'

& 0+

"

,1

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 7.212765957 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable directly burried (6 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x35 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

20 0.415 0.8 3.39 0.04 94 120

0.54 0.513

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 27.82 FULL LOAD CURRENT/DERATING FACTOR 54.24 113 0.48

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 35 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 35 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP CABLE SIZE CHOSEN

522

= = = = = = =

3.5C x35 Sqmm AL XLPE cable 1.11 0.0783 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

=

1.302918856

=

3.5CX35

sq.mm Al XLPE Cable

* , A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

'

& 0+

"

,1

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

5.6 7 0.415 0.8 3.39 0.04 94 120

= = = = = = =

= = =

Ish* t/K 7.212765957 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable directly burried (6 cables touching)

= =

0.54 0.513

Ifl

= = 2 CURRENT RATING REQ.AFTER CONSIDERING DERATING =

3 Current carring capacity of 4C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

WORLING LOAD (KVA)/1.732 x VOLTAGE 9.74 FULL LOAD CURRENT/DERATING FACTOR 18.98 67 0.28

= =

CHECK FOR VOLTAGE DROP CABLE SIZE = R AT CONDUCTOR TEMP. (4C x16 SQmm AL XLPE Cable) = X AT CONDUCTOR TEMP. (4C x16 Qmm AL XLPE Cable) = COSø = SINø = No of runs: = % VOLTAGE DROP =

7 % VOLTAGE DROP CABLE SIZE CHOSEN

523

4C x16 Sqmm AL XLPE cable 2.44 0.0837 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

=

0.976550907

=

4CX16

sq.mm Al XLPE Cable

* , A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

'

& 0+

"

Ish t K

2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR

= = =

Ish* t/K 7.212765957 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable directly burried (6 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 4C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

12 15 0.415 0.8 3.39 0.04 94 105

= = = = = = =

B) 1 AREA OF CONDUCTOR

D) 1 FULL LOAD CURRENT

,1#

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (4C x16 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (4C x16 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP CABLE SIZE CHOSEN

524

0.54 0.513

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 20.87 FULL LOAD CURRENT/DERATING FACTOR 40.68 67 0.61

= =

= = = = = = =

4C x16 Sqmm AL XLPE cable 2.44 0.0837 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

=

1.831032951

=

4CX16

sq.mm Al XLPE Cable

*, A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

23&0 ! +

" /

4 &"

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR

= = =

2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

19 25 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING Considering 35% extra current 3 Current carring capacity of 3.5C x120 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

Ish* t/K

= = =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

75 0.415 0.8 8.93 0.04 94 25

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 120 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 104.34 FULL LOAD CURRENT/DERATING FACTOR 166.42 224.66 257 0.87

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

525

3.5C x120 Sqmm AL XLPE cable 0.264 0.0716 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.276701989 3.5CX120

sq.mm Al XLPE Cable

!" A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

Ish t K

B) 1 AREA OF CONDUCTOR

= = = = = = =

100 0.415 0.8 3.09 0.08 94 25

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

#

45 0.95 Cable laid in ground (3 cables touching)

= =

0.69 0.6555

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 139.12 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 212.24 = cable is 223 3 Current carring capacity of 3.5C x120 Sqmm AL XLPE 4 No of cable required = 0.95

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3.5C x120 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL=XLPE Cable)0.324 X AT CONDUCTOR TEMP. (3.5C x 120 Qmm AL XLPE = Cable) 0.0712 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

526

0.438263899 3.5CX120

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

#

%% &

= = = = = = =

29 0.415 0.8 2.64 0.08 94 45

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

=

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 40.35 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 64.35 70 3 Current carring capacity of 3C x16 Sqmm AL XLPE=cable is 4 No of cable required = 0.92

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x16Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE = Cable) 2.44 X AT CONDUCTOR TEMP. (3C x 16 Qmm AL XLPE = Cable) 0.0808 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

527

1.515823138 2X3CX16

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

#

&

= = = = = = =

16 0.415 0.8 2.64 0.08 94 55

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 22.26 2 CURRENT RATING REQ.AFTER CONSIDERING = DERATING FULL LOAD CURRENT/DERATING FACTOR 35.50 3 Current carring capacity of 3C x10 Sqmm AL XLPE= cable is 67 4 No of cable required = 0.53

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x10 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (3C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 % VOLTAGE DROP = (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

528

1.636204732 2X3CX10

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

!"

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

Ish t K

B) 1 AREA OF CONDUCTOR

#

%

'

= = = = = = =

20 0.415 0.8 2.64 0.08 94 35

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 27.82 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 44.38 Considering 35% extra current 59.91 3 Current carring capacity of 4C x10 Sqmm AL XLPE= cable is 67 4 No of cable required = 0.89

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 4C x10 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (4C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (4C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

529

1.301526492 4CX10

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

# 10 12.5 0.415 0.8 2.64 0.08 94 30

= = = = = = =

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 17.39 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 27.74 67 3 Current carring capacity of 4C x10 Sqmm AL XLPE= cable is 4 No of cable required = 0.41

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 4C x10 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (4C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (4C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

530

0.697246335 4CX10

sq.mm Al XLPE Cable

TRANSFORMER SIZING FOR JATNI (KAJU PLANTATION) PUMPING STATION

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

2.0

L. F.

= Load Factor

P. F.

= Motor Power Factor

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

Input Data and Calculations:

Sr. No.

Item Description

Connected Load

Rating in kW

Effi.

P. F.

L. F.

D. F.

Working Load

Unit

Total (kW)

Unit

Total (kW)

Working Load (kVA)

2.1

Pump-1

22

0.917

0.83

0.9

1

2

44

1

19.8

26.01

2.2

Pump-2

11

0.892

0.81

0.9

1

2

22

2

19.8

27.40

2.3

Chain pully

2

0.83

0.82

1

2

1

2

1

1

1.47

2.4 2.5

Exhaust Fan

0.5 10

0.67 0.8

0.82 0.8

1 1

1 1.5

6 Lumpsum

3 10 81

Lighting Total Load

3.0

Considering 20% contingency

=

4.0

System P. F.

=

0.71

5.0 5.1 5.2 5.3 5.4 5.5 5.6

Calculation to check the starting of largest size motor Rating of transformer assumed % impedance of transformer assumed Rating of the largest size motor Supply voltage P.F of largest size motor Efficiency of largest size motor

= = = = = =

100 4.5 22 0.415 0.83 0.917

6 3 Lumpsum 6.6666667 50.266667

5.46 10.42 70.77

84.92 kVA

kVA % KW kV

Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

5.7

FLC of motor

=

40.212 A

5.8

Rating of largest size motor in kVA

=

28.905 kVA

=

71.095 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

=

173.43 kVA

= 6 x 1.7321 x kV x I FLC = 3 x 1.7321 x kV x I FLC

5.10

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

5.11

Motor starting Kva with Star-Delta start

=

101.17 kVA

5.12

Fault Level at transformer secondary side

=

2.2222 MVA

5.13

Fault current of transformer secondary side (ISC)

=

3.0915 kA

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star-Delta starting

=

2222.2 kVA

=

11.004 %

=

7.8 %

5.9

5.15 5.16

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

531

100 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1) 2 Total Working load 3 Power factor To be improved (pf2)

0.710 50 0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

40

532

KVAR

TRANSFORMER SIZING FOR JATNI (KAJU PLANTATION) PUMPING STATION

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

2.0

L. F.

= Load Factor

P. F.

= Motor Power Factor

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

Input Data and Calculations:

Sr. No.

Item Description

Connected Load

Rating in kW

Effi.

P. F.

L. F.

D. F.

Working Load

Unit

Total (kW)

Unit

Total (kW)

Working Load (kVA)

2.1

Pump-1

22

0.917

0.83

0.9

1

2

44

1

19.8

26.01

2.2

Pump-2

11

0.892

0.81

0.9

1

2

22

2

19.8

27.40

2.3

Chain pully

2

0.83

0.82

1

2

1

2

1

1

1.47

2.4 2.5

Exhaust Fan

0.5 10

0.67 0.8

0.82 0.8

1 1

1 1.5

6 Lumpsum

3 10 81

Lighting Total Load

3.0

Considering 20% contingency

=

4.0

System P. F.

=

0.71

5.0 5.1 5.2 5.3 5.4 5.5 5.6

Calculation to check the starting of largest size motor Rating of transformer assumed % impedance of transformer assumed Rating of the largest size motor Supply voltage P.F of largest size motor Efficiency of largest size motor

= = = = = =

100 4.5 22 0.415 0.83 0.917

6 3 Lumpsum 6.6666667 50.266667

5.46 10.42 70.77

84.92 kVA

kVA % KW kV

Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

5.7

FLC of motor

=

40.212 A

5.8

Rating of largest size motor in kVA

=

28.905 kVA

=

71.095 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

=

173.43 kVA

= 6 x 1.7321 x kV x I FLC = 3 x 1.7321 x kV x I FLC

5.10

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

5.11

Motor starting Kva with Star-Delta start

=

101.17 kVA

5.12

Fault Level at transformer secondary side

=

2.2222 MVA

5.13

Fault current of transformer secondary side (ISC)

=

3.0915 kA

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star-Delta starting

=

2222.2 kVA

=

11.004 %

=

7.8 %

5.9

5.15 5.16

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

533

100 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1) 2 Total Working load 3 Power factor To be improved (pf2)

0.710 50 0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

40

534

KVAR

!" A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

Ish t K

B) 1 AREA OF CONDUCTOR

= = = = = = =

100 0.415 0.8 3.09 0.08 94 25

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

#

45 0.95 Cable laid in ground (3 cables touching)

= =

0.69 0.6555

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 139.12 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 212.24 = cable is 223 3 Current carring capacity of 3.5C x120 Sqmm AL XLPE 4 No of cable required = 0.95

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3.5C x120 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL=XLPE Cable)0.324 X AT CONDUCTOR TEMP. (3.5C x 120 Qmm AL XLPE = Cable) 0.0712 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

535

0.438263899 3.5CX120

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

#

%% &

= = = = = = =

29 0.415 0.8 2.64 0.08 94 45

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

=

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 40.35 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 64.35 70 3 Current carring capacity of 3C x16 Sqmm AL XLPE=cable is 4 No of cable required = 0.92

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x16Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE = Cable) 2.44 X AT CONDUCTOR TEMP. (3C x 16 Qmm AL XLPE = Cable) 0.0808 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

536

1.515823138 2X3CX16

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

#

&

= = = = = = =

16 0.415 0.8 2.64 0.08 94 55

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 22.26 2 CURRENT RATING REQ.AFTER CONSIDERING = DERATING FULL LOAD CURRENT/DERATING FACTOR 35.50 3 Current carring capacity of 3C x10 Sqmm AL XLPE= cable is 67 4 No of cable required = 0.53

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x10 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (3C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 % VOLTAGE DROP = (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

537

1.636204732 2X3CX10

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

!"

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

Ish t K

B) 1 AREA OF CONDUCTOR

#

%

'

= = = = = = =

20 0.415 0.8 2.64 0.08 94 35

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 27.82 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 44.38 Considering 35% extra current 59.91 3 Current carring capacity of 4C x10 Sqmm AL XLPE= cable is 67 4 No of cable required = 0.89

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 4C x10 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (4C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (4C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

538

1.301526492 4CX10

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

# 10 12.5 0.415 0.8 2.64 0.08 94 30

= = = = = = =

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 7.943667669 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 17.39 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 27.74 67 3 Current carring capacity of 4C x10 Sqmm AL XLPE= cable is 4 No of cable required = 0.41

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 4C x10 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (4C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (4C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

539

0.697246335 4CX10

sq.mm Al XLPE Cable

TRANSFORMER SIZING FOR JATNI (PHED Transmission) PUMPING STATION

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

L. F.

= Load Factor

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

P. F.

= Motor Power Factor

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

2.0

Input Data and Calculations:

Sr. No.

Item Description

Connected Load

Rating in kW

Effi.

P. F.

L. F.

D. F. Unit

Working Load

Total (kW)

Unit

Total (kW)

2.1

Pump (existing)

45

0.936

0.86

0.9

1

2

90

1

40.5

2.2

Chain pully (existing)

2.5

0.83

0.82

1

1

1

2.5

1

2.5

2.3

Lighting

8

0.8

0.8

1

1.3

Lumpsum

8

2.4

Exhaust Fan (existing)

0.5

0.67

0.82

1

1

6

3

Total Load

103.5

Working Load (kVA)

Lumpsum 6.1538462 6

50.31 3.67 9.62

3

5.46

52.153846

69.06

3.0

Considering 20% contingency

=

4.0

System P. F.

=

0.76

5.0 5.1 5.2 5.3 5.4 5.5 5.6

Calculation to check the starting of largest size motor Rating of transformer assumed % impedance of transformer assumed Rating of the largest size motor Supply voltage P.F of largest size motor Efficiency of largest size motor

= = = = = =

100 4.5 45 0.415 0.86 0.936

FLC of motor

=

77.771 A

Rating of largest size motor in kVA

=

55.903 kVA

=

44.097 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

5.7 5.8

82.87 kVA

Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

kVA % KW kV

5.10

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

=

335.42 kVA

= 6 x 1.7321 x kV x I FLC

5.11

Motor starting Kva with Star-Delta start

=

111.81 kVA

= 3 x 1.7321 x kV x I FLC

5.12

Fault Level at transformer secondary side

=

2.2222 MVA

5.13

Fault current of transformer secondary side (ISC)

=

3.0915 kA

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star-Delta starting

=

2222.2 kVA

=

17.078 %

=

7.0 %

5.9

5.15 5.16

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

540

100 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1) 2 Total Working load 3 Power factor To be improved (pf2)

0.755 52 0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

35

541

KVAR

!"# A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

100 0.415 0.8 3.09 0.08 94 60

= = =

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in ground (3 cables touching)

= =

Ifl

0.69 0.6555

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x120 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

$

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 120 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

WORLING LOAD (KVA)/1.732 x VOLTAGE 139.12 FULL LOAD CURRENT/DERATING FACTOR 212.24 223 0.95

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

542

3.5C x120 Sqmm AL XLPE cable 0.324 0.0712 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.051833358 3.5CX120

sq.mm Al XLPE Cable

!"# A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

$

%& '

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x50 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

56 0.415 0.8 3.09 0.08 94 40

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 50 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 50 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 77.91 FULL LOAD CURRENT/DERATING FACTOR 124.26 142 0.88

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

543

3C x50 Sqmm AL XLPE cable 0.82 0.075 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.911737553 2X3CX50

sq.mm Al XLPE Cable

!"# A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

$

(

! ) !

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING Considering 35% extra current 3 Current carring capacity of 4C x10 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

20 0.415 0.8 3.09 0.08 94 40

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 27.82 FULL LOAD CURRENT/DERATING FACTOR 44.38 59.91 67 0.89

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (4C x 10 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (4C x 10 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

= = = = = = =

=

CABLE SIZE CHOSEN

=

544

4C x10 Sqmm AL XLPE cable 3.94 0.0837 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.487458847 4CX10

sq.mm Al XLPE Cable

!"# A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

$

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 4C x10 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

15 18.75 0.415 0.8 3.09 0.08 94 40

= = = = = = =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (4C x 10 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (4C x 10 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 26.09 FULL LOAD CURRENT/DERATING FACTOR 41.60 67 0.62

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

545

4C x10 Sqmm AL XLPE cable 3.94 0.0837 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.394492669 4CX10

sq.mm Al XLPE Cable

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1) 2 Total Working load 3 Power factor To be improved (pf2)

0.749 81 0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

55

546

KVAR

TRANSFORMER SIZING FOR JATNI (PHED) PUMPING STATION

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

L. F.

= Load Factor

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

P. F.

= Motor Power Factor

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

2.0

Input Data and Calculations:

Sr. No.

Item Description

Connected Load

Rating in kW

Effi.

P. F.

L. F.

D. F.

Working Load

Unit

Total (kW)

Unit

Total (kW)

Working Load (kVA)

2.1

Pump-1

37

0.935

0.86

0.9

1

2

74

1

33.3

41.41

2.2

Pump-2

18.5

0.913

0.83

0.9

1

2

37

2

33.3

43.94

2.3

Crane

2.5

0.87

0.82

1

1

1

2.5

1

2.5

3.50

2.4

Exhaust Fan

0.5

0.67

0.82

1

1

6

3

6

3

2.5

Lighting Total Load

10.124

0.8

0.8

1

1.2

Lumpsum

10.124

Lumpsum 8.4366667

13.18

126.624

80.536667

107.50

3.0

Considering 20% contingency

=

4.0

System P. F.

=

0.75

5.0 5.1 5.2 5.3 5.4 5.5 5.6

Calculation to check the starting of largest size motor Rating of transformer assumed % impedance of transformer assumed Rating of the largest size motor Supply voltage P.F of largest size motor Efficiency of largest size motor

= = = = = =

160 4.5 37 0.415 0.86 0.935

5.46

129.00 kVA

Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

kVA % KW kV

5.7

FLC of motor

=

64.013 A

5.8

Rating of largest size motor in kVA

=

46.014 kVA

=

113.99 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

5.10

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

=

276.09 kVA

= 6 x 1.7321 x kV x I FLC

5.11

Motor starting Kva with Star-Delta start

=

161.05 kVA

= 3 x 1.7321 x kV x I FLC

5.12

Fault Level at transformer secondary side

=

3.5556 MVA

5.13

Fault current of transformer secondary side (ISC)

=

4.9464 kA

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star-Delta starting

=

3555.6 kVA

=

10.971 %

=

7.7 %

5.9

5.15 5.16

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

547

160 kVA

(within 10%) (within 10%)

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

160 0.415 0.8 4.95 0.08 94 30

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in ground (3 cables touching)

= =

Ifl

0.69 0.6555

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x120 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

%

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 120 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

WORLING LOAD (KVA)/1.732 x VOLTAGE 222.60 FULL LOAD CURRENT/DERATING FACTOR 339.59 223 1.52

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

548

3.5C x120 Sqmm AL XLPE cable 0.324 0.0712 0.8 0.6 2 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.420733343 2X3.5CX120

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

&' (

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x35 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

46 0.415 0.8 4.95 0.08 94 55

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 35 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 35 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 64.00 FULL LOAD CURRENT/DERATING FACTOR 102.07 117 0.87

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

549

3C x35 Sqmm AL XLPE cable 1.11 0.0783 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.373493628 2X3CX35

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

)*+ (

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

25 0.415 0.8 4.95 0.08 94 65

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 16 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 34.78 FULL LOAD CURRENT/DERATING FACTOR 55.47 70 0.79

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

550

3C x16 Sqmm AL XLPE cable 2.44 0.0783 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.886103934 2X3CX16

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

,'

" - "

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING Considering 35% extra current 3 Current carring capacity of 3.5C x25 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

30 0.415 0.8 4.95 0.08 94 40

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 25 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 25 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 41.74 FULL LOAD CURRENT/DERATING FACTOR 66.57 89.87 96 0.94

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

551

3.5C x25 Sqmm AL XLPE cable 1.54 0.0805 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.892065612 3.5CX25

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 4C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

10 12.5 0.415 0.8 4.95 0.08 94 40

= = = = = = =

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 17.39 FULL LOAD CURRENT/DERATING FACTOR 27.74 67 0.41

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (4C x 16 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (4C x 16 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

= = = = = = =

=

CABLE SIZE CHOSEN

=

552

4C x16 Sqmm AL XLPE cable 2.44 0.0808 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.580775149 4CX16

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

160 0.415 0.8 4.94 0.08 94 35

= = =

Ish* t/K

= = =

45 0.95 Cable laid in ground (3 cables touching)

14.86428723 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= =

Ifl

0.69 0.6555

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x120 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

%

WORLING LOAD (KVA)/1.732 x VOLTAGE 222.60 FULL LOAD CURRENT/DERATING FACTOR 339.59 223 1.52

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 120 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

= = = = = = =

=

CABLE SIZE CHOSEN

=

553

3.5C x120 Sqmm AL XLPE cable 0.324 0.0712 0.8 0.6 2 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.490855567 2 X 3.5CX120

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

&

'

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

0.66 0.627

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

37 0.415 0.8 4.95 0.08 94 60

WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 29.72 FULL LOAD CURRENT/DERATING FACTOR 47.40 70 0.68

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 16 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

= = = = = = =

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

554

3C x16 Sqmm AL XLPE cable 2.44 0.0808 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.48882313 2X3CX16

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

()* '

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

24 0.415 0.8 4.95 0.08 94 70

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 16 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 33.39 FULL LOAD CURRENT/DERATING FACTOR 53.25 70 0.76

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

555

3C x16 Sqmm AL XLPE cable 2.44 0.0783 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.949941298 2X3CX16

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

+)& '

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

13 0.415 0.8 4.95 0.08 94 85

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 16 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 16 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 18.09 FULL LOAD CURRENT/DERATING FACTOR 28.85 70 0.41

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

556

3C x16 Sqmm AL XLPE cable 2.44 0.0783 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.282550675 2X3CX16

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

,#

,

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

0.66 0.627

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 4C x16 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

15 18.75 0.415 0.8 4.95 0.08 94 30

= = = = = = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 26.09 FULL LOAD CURRENT/DERATING FACTOR 41.60 70 0.59

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (4C x 16 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (4C x 16 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

= = = = = = =

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

557

4C x16 Sqmm AL XLPE cable 2.44 0.0808 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.653372042 4CX16

sq.mm Al XLPE Cable

! "#$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

%

&

" - "

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 14.89437688 16 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING Considering 35% extra current 3 Current carring capacity of 3.5C x25 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

31 0.415 0.8 4.95 0.08 94 40

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 25 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 25 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 43.13 FULL LOAD CURRENT/DERATING FACTOR 68.79 92.86 96 0.97

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

558

3.5C x25 Sqmm AL XLPE cable 3.94 0.0837 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 2.305561214 3.5CX25 .

sq.mm Al XLPE Cable

TRANSFORMER SIZING FOR KHORDA (JAMADEI) PUMPING STATION

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

2.0

L. F.

= Load Factor

P. F.

= Motor Power Factor

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

Input Data and Calculations:

Sr. No.

Item Description

Rating in kW

Connected Load Effi.

P. F.

L. F.

D. F. Unit

Working Load

Total (kW)

Unit

Total (kW)

Working Load (kVA)

2.1

Pump -1

18.5

0.913

0.83

0.95

1

2

37

1

17.575

23.19

2.2

Pump-2

9.3

0.892

0.81

0.95

1

2

18.6

2

17.67

24.46

2.3

Pump-3

30

0.925

0.84

0.95

1

2

60

1

28.5

36.68

2.4

Exhaust Fan

0.5

0.67

0.82

1

1

8

4

8

4

7.28

2.4

Crane

7.5

0.87

0.82

1

2

1

7.5

1

3.75

5.26

2.5

Lighting and small power (indoor and outdoor)

11.314

0.8

0.8

1

1.5

Lumpsum

11.314

Lumpsum 7.5426667

11.79

138.414

79.037667

108.65

Total Load

3.0

Considering 20% contingency

=

4.0

System P. F.

=

0.73

5.0 5.1 5.2 5.3 5.4 5.5 5.6

Calculation to check the starting of largest size motor Rating of transformer assumed % impedance of transformer assumed Rating of the largest size motor Supply voltage P.F of largest size motor Efficiency of largest size motor

= = = = = =

160 4.5 30 0.415 0.84 0.925

FLC of motor

=

53.713 A

Rating of largest size motor in kVA

=

38.61 kVA

=

121.39 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

5.7 5.8

130.38 kVA

kVA % KW kV

Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

5.10

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

=

231.66 kVA

= 6 x 1.7321 x kV x I FLC

5.11

Motor starting Kva with Star-Delta start

=

77.22 kVA

= 3 x 1.7321 x kV x I FLC

5.12

Fault Level at transformer secondary side

=

3.5556 MVA

5.13

Fault current of transformer secondary side (ISC)

=

4.9464 kA

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star-Delta starting

=

3555.6 kVA

=

9.9295 %

=

5.6 %

5.9

5.15 5.16

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

559

160 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1) 2 Total Working load 3 Power factor To be improved (pf2)

0.727 79 0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

59

560

KVAR

TRANSFORMER SIZING FOR KHORDA ( Gurjanga) PUMPING STATION

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

2.0

L. F.

= Load Factor

P. F.

= Motor Power Factor

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

Input Data and Calculations:

Sr. No.

Item Description

Rating in kW

Connected Load Effi.

P. F.

L. F.

D. F.

Total (kW)

Unit

Working Load Unit

Total (kW)

Working Load (kVA)

2.1

Pump -1

22

0.917

0.83

0.95

1

2

44

1

20.9

27.46

2.2

Pump -2

11

0.892

0.81

1

1

2

22

2

22

30.45

2.3

Crane

7.5

0.87

0.82

0.9

2

1

7.5

1

3.375

4.73

2.4 2.5

Exhaust Fan

0.5 10.646

0.67 0.8

0.82 0.8

1 1

1 1.3

8 Lumpsum

4 10.646 88.146

3.0

Considering 20% contingency

=

4.0

System P. F.

=

0.71

5.0 5.1 5.2 5.3 5.4 5.5 5.6

Calculation to check the starting of largest size motor Rating of transformer assumed % impedance of transformer assumed Rating of the largest size motor Supply voltage P.F of largest size motor Efficiency of largest size motor

= = = = = =

100 4.5 22 0.415 0.83 0.917

Lighting Total Load

kVA % KW kV

Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

FLC of motor

=

40.212 A

5.8

Rating of largest size motor in kVA

=

28.905 kVA

=

71.095 kVA

=

173.43 kVA

= 6 x 1.7321 x kV x I FLC = 3 x 1.7321 x kV x I FLC

5.10

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

5.11

Motor starting Kva with Star-Delta start

=

57.81 kVA

5.12

Fault Level at transformer secondary side

=

2.2222 MVA

5.13

Fault current of transformer secondary side (ISC)

=

3.0915 kA

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star-Delta starting

=

2222.2 kVA

=

11.004 %

=

5.8 %

5.15 5.16

7.28 12.80 82.72

99.26 kVA

5.7

5.9

8 4 Lumpsum 8.1892308 58.464231

(Rating in kVA of transformer assumed - Largest motor KVA)

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

561

100 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1) 2 Total Working load 3 Power factor To be improved (pf2)

0.707 58 0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

47

562

KVAR

!" A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

Ish t K

B) 1 AREA OF CONDUCTOR

= = = = = = =

100 0.415 0.8 3.09 0.08 94 60

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

#

45 0.95 Cable laid in ground (3 cables touching)

= =

0.69 0.6555

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 139.12 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 212.24 = cable is 223 3 Current carring capacity of 3.5C x120 Sqmm AL XLPE 4 No of cable required = 0.95

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3.5C x120 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3.5C x 120 SQmm AL=XLPE Cable) 0.21 X AT CONDUCTOR TEMP. (3.5C x 120 Qmm AL XLPE = Cable) 0.0718 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

563

0.735363623 3.5CX120

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

#

%

= = = = = = =

16 0.415 0.8 3.09 0.08 94 55

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 = 12.85 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 20.50 67 3 Current carring capacity of 3C x10 Sqmm AL XLPE=cable is 4 No of cable required = 0.31

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x10Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (3C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP CABLE SIZE CHOSEN

= =

564

0.944690954 2X3CX10

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

Ish t K

B) 1 AREA OF CONDUCTOR

#

&& %

= = = = = = =

29 0.415 0.8 3.09 0.08 94 40

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 = 23.29 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 37.15 67 3 Current carring capacity of 3C x10 Sqmm AL XLPE=cable is 4 No of cable required = 0.55

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x10 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3C x 10 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (3C x 10 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP CABLE SIZE CHOSEN

= =

565

1.245274439 2X3CX10

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!"

#

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 4C x10 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

12 15 0.415 0.8 3.09 0.08 94 40

= = = = = = =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (4C x 10 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (4C x 10 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.66 0.627

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 20.87 FULL LOAD CURRENT/DERATING FACTOR 33.28 67 0.50

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

566

4C x10 Sqmm AL XLPE cable 3.94 0.0837 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 1.115594136 4CX10

sq.mm Al XLPE Cable

$ A) 1 2 2 3 4 5 6 7

!"

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

Ish t K

B) 1 AREA OF CONDUCTOR

#

&'

(

= = = = = = =

25 0.415 0.8 3.09 0.08 94 40

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 9.297701931 10 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 34.78 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 55.47 Considering 35% extra current 74.89 3 Current carring capacity of 3.5C x25 Sqmm AL XLPE = cable is 96 4 No of cable required = 0.78

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3.5C x25 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3.5C x 25 SQmm AL XLPE = Cable) 3.94 X AT CONDUCTOR TEMP. (3.5C x 25 Qmm AL XLPE = Cable) 0.0837 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

567

1.859323559 3.5CX25 .

sq.mm Al XLPE Cable

TRANSFORMER SIZING FOR KHORDA ( PHED) PUMPING STATION

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

2.0

L. F.

= Load Factor

P. F.

= Motor Power Factor

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

Input Data and Calculations:

Sr. No.

Item Description

Rating in kW

Connected Load Effi.

L. F.

P. F.

D. F. Unit

Total (kW)

Working Load Unit

Total (kW)

Working Load (kVA)

2.1

Pump -1

90

0.95

0.85

0.9

1

2

180

1

81

100.31

2.2

Pump -2

45

0.936

0.86

0.9

1

2

90

2

81

100.63

2.3

Crane

7.5

0.87

0.82

0.9

2

1

7.5

1

3.375

4.73

2.3 2.4

Exhaust Fan

0.5 15

0.67 0.8

0.82 0.8

1 1

1 1.5

8 Lumpsum

4 15 296.5

8 Lumpsum

4 10 179.375

7.28 15.63 228.57

3.0

Considering 20% contingency

=

4.0

System P. F.

=

0.78

5.0 5.1 5.2 5.3 5.4 5.5 5.6

Calculation to check the starting of largest size motor Rating of transformer assumed % impedance of transformer assumed Rating of the largest size motor Supply voltage P.F of largest size motor Efficiency of largest size motor

= = = = = =

315 4.5 90 0.415 0.85 0.95

Lighting Total Load

274.29 kVA

kVA % KW kV

Nearest staanddard size (Confg. 11/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

5.7

FLC of motor

=

155.05 A

5.8

Rating of largest size motor in kVA

=

111.46 kVA

=

203.54 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

=

668.73 kVA

= 6 x 1.7321 x kV x I FLC

222.91 kVA

= 3 x 1.7321 x kV x I FLC

5.10

Base load on transformer before starting largest motor Motor starting Kva with DOL start

5.11

Motor starting Kva with Star-Delta start

=

5.12

Fault Level at transformer secondary side

=

5.13

Fault current of transformer secondary side (ISC)

=

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star-Delta starting

=

5.9

5.15 5.16

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV

7 MVA 9.7382 kA 7000 kVA

=

12.461 %

=

6.1 %

1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

568

315 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

1 Average Power factor (pf1)

0.785

2 Total Working load

179

3 Power factor To be improved (pf2)

0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

105

569

KVAR

! A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 29.30130143 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in ground (3 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x240 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

315 0.415 0.8 9.738 0.08 94 30

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 240 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 240 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.69 0.6555

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 438.24 FULL LOAD CURRENT/DERATING FACTOR 668.56 326 2.05

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

570

3.5C x240 Sqmm AL XLPE cable 0.16 0.071 0.8 0.6 2 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.468041806 2X3.5CX240

sq.mm Al XLPE Cable

" A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!

Ish t K

B) 1 AREA OF CONDUCTOR

#$ %

= = = = = = =

112 0.415 0.8 9.73 0.08 94 55

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 29.27722971 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 = 89.97 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 143.49 142 3 Current carring capacity of 3C x50 Sqmm AL XLPE=cable is = 1.01 4 No of cable required

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x50 Sqmm AL XLPE cable = Cable) 0.82 R AT CONDUCTOR TEMP. (3C x 50 SQmm AL XLPE = Cable) 0.075 X AT CONDUCTOR TEMP. (3C x 50 Qmm AL XLPE COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP CABLE SIZE CHOSEN

= =

571

1.447620248 2X3CX50

sq.mm Al XLPE Cable

" A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!

Ish t K

B) 1 AREA OF CONDUCTOR

&' %

= = = = = = =

56 0.415 0.8 9.27 0.08 94 65

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 27.89310579 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (6 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 = 44.98 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 71.74 117 3 Current carring capacity of 3C x35 Sqmm AL XLPE=cable is = 0.61 4 No of cable required

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3C x35 Sqmm AL XLPE cable = Cable) 1.11 R AT CONDUCTOR TEMP. (3C x 35 SQmm AL XLPE = Cable) 0.0783 X AT CONDUCTOR TEMP. (3C x 35 Qmm AL XLPE COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP CABLE SIZE CHOSEN

= =

572

1.140931639 2X3CX35

sq.mm Al XLPE Cable

" A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

!

''

(

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 27.89310579 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

0.66 0.627

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING Considering 35% extra current 3 Current carring capacity of 3.5C x70 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

55 0.415 0.8 9.27 0.08 94 40

WORLING LOAD (KVA)/1.732 x VOLTAGE 76.52 FULL LOAD CURRENT/DERATING FACTOR 122.04 164.75 179 0.92

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 70 SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 70 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

= = = = = = =

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

573

3.5C x70 Sqmm AL XLPE cable 0.567 0.074 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.636144578 3.5CX70 .

sq.mm Al XLPE Cable

TRANSFORMER SIZING FOR RWPS PLANT

1.0

Formula Used:

1.1

Working Load in kVA

=

[ Working Load (kW) x L. F. ] / [ D. F. x P. F. x Effi. ]

L. F.

= Load Factor

1.2

System P. F.

=

Total Working Load (kW) / Total Working Load (kVA)

P. F.

= Motor Power Factor

2.0

D. F.

= Diversity Factor

Effi.

= Motor Efficiency

Input Data and Calculations:

Sr. No.

Item Description

Connected Load

Rating in kW

Effi.

P. F.

L. F.

D. F.

Working Load

Unit

Total (kW)

Unit

Total (kW)

Working Load (kVA)

2.1

Vertcal Pump

132

0.957

0.86

0.9

1

3

396

2

237.6

288.69

2.2

Dewatering pump

1.5

0.79

0.81

1

1.5

1

1.5

1

1

1.56

2.3

EOT crane

15

0.902

0.81

0.9

2

1

15

1

6.75

9.24

2.4

Chain pully

3.7

0.83

0.82

0.9

2

1

3.7

1

1.665

2.45

2.5

Exhaust fan

0.5

0.67

0.82

1

1

6

3

6

3

5.46

2.6

Lighting (Indoor & Outdoor)

10

0.9

0.8

1

1.5

Lumsum

10

Total Load

429.2

3.0 Considering 20% contingency

=

376.29 kVA

4.0 System P. F.

=

0.8186

5.0 Calculation to check the starting of largest size motor 5.1 Rating of transformer assumed = 5.2 % impedance of transformer assumed = 5.3 Rating of the largest size motor = 5.4 Supply voltage = 5.5 P.F of largest size motor = 5.6 = Efficiency of largest size motor

400 4.5 132 0.415 0.86 0.957

kVA % KW kV

223.122046 A

Lumsum 6.6666667 256.68167

6.17 313.57

Nearest staanddard size (Confg. 33/0.433KV,Dyn11,Delta-star) From IS 2026 From the above table System voltage From the above table From the above table kW x 1000 1.7321 x V x p.f x efficiency kW P.F x Efficiency

5.7

FLC of motor

=

5.8

Rating of largest size motor in kVA

=

160.3849238 kVA

=

239.6150762 kVA

(Rating in kVA of transformer assumed - Largest motor KVA)

=

962.3095429 kVA

= 6 x 1.7321 x kV x I FLC = 3 x 1.7321 x kV x I FLC

5.10

Base load on transformer before starting fourth largest motor Motor starting Kva with DOL start

5.11

Motor starting Kva with Star Delta start

=

320.7698476 kVA

5.12

Fault Level at transformer secondary side

=

8.888888889 MVA

5.13

Fault current of transformer secondary side (ISC)

=

12.36591962 kA

5.14

S.C capacity of transformer Voltage drop at transformer terminal when largest motor start with DOL starting Voltage drop at transformer terminal when largest motor start with Star Delta starting

=

8888.888889 kVA

=

13.52165196 %

=

6.3 %

5.9

5.15 5.16

Rating of transformer in MVA x 100 Impedance of transformer in % Fault Level in MVA 1.7321 x kV 1.7321 x kV x I SC [Motor Starting kVA (DOL) + Base Load kVA] x 100 S.C capacity of transformer [Motor Starting kVA (S/D) + Base Load kVA] x 100 S.C capacity of transformer

The selected rating of transformer is

574

400 kVA

(within 10%) (within 10%)

CAPACITOR BANK SIZING ACROSS BUS

Intermediate Pumping Station 1 Average Power factor (pf1)

0.819

2 Total Working load in IPS

257

3 Power factor To be improved (pf2)

0.98 Working load ( Tan ( Cos-1 pf1) - Tan (Cos-1 pf2))

Total kVAR to be connected across Bus 4 Total kVAR to be connected across Bus

kW

128

575

KVAR

Short circuit calculation RWPS Assumptions 1 Fault level at 220kV bus

20000 MVA

2 Base MVA

(as per IS :2026)

2000

Transformer Details at Chandaka220KV/132KV Ratio = 220kV / 132kV 100.00 MVA Capacity = 9.27% Z= 1 Nos Qty 8.34% Considering negative tolerance Z = 8.34% Net Z for transformers single transformer= 3 Transformer Details at Chandaka 132KV/33KV Ratio = 132kV / 33kV 40.00 MVA Capacity = 10.18% Z= 1 Nos Qty 9.16% Considering negative tolerance Z = 9.16% Net Z for transformers single transformer= 4 33kV Over head line from Chandaka to CWPS Line length = Conductor Type = Conductor Resiatance = Z,Considering Reactance Negligible =

18 DOG 0.2733 4.9194

kM Assumed ohm/kM ohm

5 Transformer at CWPS Ratio = 33kV / 0.415kV 0.40 MVA Capacity = 4.5% Z= 1 Nos Qty 4.1% Considering negative tolerance Z = 4.1% Net Z for transformers single transformer= 6

7

K' Constant for XLPE AL cable=

94

K' Constant for PVC AL cable=

75

K' Constant for PVC CU cable=

112

Fault clearing time for 33kV Breaker (t) = 1

Sec

Fault clearing time for 0.415kV ACB Breaker (t) = 0.08

10

Fault clearing time for 0.415kV MCCB Breaker (t) = 0.04 Starting Voltage dip =

Sec Sec 15%

11

Starting current for DOL=

6 times

12

Starting current for Y-D=

2 times

13

Starting current for FCMA softstarter=

2.5 times

Formula used 1

2

Zsource =

Ztransformer =

Base MVA Fault level at 220kV bus Base MVA Transformer capacity in MVA

X tranformer Z%

3

Zline =

Base MVA 2 kV

X Line Z

4

Zcable =

Base MVA 2 kV

X Cable Z

576

Calculation Sr No Description a chandaka Grid Substation

b

Impedance " Z"

220KV Bus

0.1

220KV/132KV,100MVA transformer

1.7

1 132kV Bus

1.8

2 132kV/33kV,40MVA transformer

4.6

3 33kV Bus

6.3

Fault level Fault Current "MVA" "kA"

Minimum Cable size "SQMM"

20000

52

1130.8

5

315.0

5.51

130.0

2.27

24.2

9.2

12.77

38.4 (XLPE,AL,0.415kV)

8.1

11.22

33.8 (,AL,0.415 kV)

3.7

5.20

11.1

RWPS 1 18 kM 33kV O/H line from Chandaka Substation to RWPS

9.03

2 33kV Bus

15.38

3 33kV/0.415kV, 0.4MVA transformer

202.50

4 0.415kV side of 0.4MVA transformer

217.88

0.415kV , XLPE ,3 X 3.5core x 185sqmm cable from 5 transformer to RWPS PMCC

30.07

6 RWPS PMCC

247.95

0.415kV , XLPE ,3.5core x 50sqmm cable from RWPS 7 PMCC to RWPS Auxilary MCC

286.87

8 RWPS Auxilary MCC

534.82

577

A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 36.76955262 50 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in Ground (3 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x185 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

400 0.415 0.8 12.22 0.08 94 35

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 185SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 185 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.69 0.6555

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 556.50 FULL LOAD CURRENT/DERATING FACTOR 848.97 282 3.01

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

578

3.5C x185 Sqmm AL XLPE cable 0.21 0.0718 0.8 0.6 3 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.571949485 3X3.5CX185 sq.mm Al XLPE Cable

!"# A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 31.08260872 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

0.69 0.6555

= = =

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3C x95 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

160 0.415 0.8 10.33 0.08 94 45

WORLING LOAD (KVA)/1.732 x VOLTAGE x 1.732 128.52 FULL LOAD CURRENT/DERATING FACTOR 196.07 221 0.89

= =

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3C x 70SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3C x 70SQmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

= = = = = = =

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

579

3C x95 Sqmm AL XLPE cable 0.41 0.0724 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.896555308 2X3CX95

sq.mm Al XLPE Cable

$%&' ( A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

= = = = = = =

Ish t K

B) 1 AREA OF CONDUCTOR 2 CABLE SIZE CHOSEN

C) LAYING CONDITIONS 1 AMBIENT AIR TEMPERATURE RATING FACTOR 2 GROUPING/SPACING WITH OTHER CABLES

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

= = =

Ish* t/K 31.08260872 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

= = =

45 0.95 Cable laid in trench (9 cables touching)

= =

Ifl

2 CURRENT RATING REQ.AFTER CONSIDERING DERATING 3 Current carring capacity of 3.5C x50 Sqmm AL XLPE cable is 4 No of cable required E) 1 2 3 4 5 6

59 0.415 0.8 10.33 0.08 94 30

CHECK FOR VOLTAGE DROP CABLE SIZE R AT CONDUCTOR TEMP. (3.5C x 50SQmm AL XLPE Cable) X AT CONDUCTOR TEMP. (3.5C x 50 Qmm AL XLPE Cable) COSø SINø No of runs: % VOLTAGE DROP

7 % VOLTAGE DROP

0.69 0.6555

= = =

WORLING LOAD (KVA)/1.732 x VOLTAGE 82.08 FULL LOAD CURRENT/DERATING FACTOR 125.22 142 0.88

= =

= = = = = = =

=

CABLE SIZE CHOSEN

=

580

3.5C x50 Sqmm AL XLPE cable 0.82 0.075 0.8 0.6 1 (FULL LOAD CURRENT X LENGTH X IMPEDENCE)/NO OF RUNS X VOLTAGE 0.720435477 3.5CX50

sq.mm Al XLPE Cable

)* A) 1 2 2 3 4 5 6 7

FEEDER DATA WORKING LOAD (KW) WORKING LOAD (KVA) VOLTAGE (V) PF FAULT CURRENT FAULT CLEARING TIME CONSTANT LENGTH

Ish t K

B) 1 AREA OF CONDUCTOR

+ , +&

= = = = = = =

75 0.415 0.8 10.63 0.08 94 40

= = =

2 CABLE SIZE CHOSEN

Ish* t/K 31.98529823 35 SQ.MM AL (AS PER SHORT CIRCUIT CALCULATION)

C) LAYING CONDITIONS = 1 AMBIENT AIR TEMPERATURE RATING FACTOR = 2 GROUPING/SPACING WITH OTHER CABLES =

RATING FACTOR 3 OVERALL DERATING FACTOR D) 1 FULL LOAD CURRENT

45 0.95 Cable laid in trench (9 cables touching)

= =

0.66 0.627

= WORLING LOAD (KVA)/1.732 x VOLTAGE = 104.34 = DERATING FULL LOAD CURRENT/DERATING FACTOR 2 CURRENT RATING REQ.AFTER CONSIDERING 166.42 Considering 35% extra current 224.66 3 Current carring capacity of 3.5C x95 Sqmm AL XLPE = cable is 221 4 No of cable required = 1.02

E) 1 2 3 4 5 6

Ifl

CHECK FOR VOLTAGE DROP CABLE SIZE = 3.5C x95 Sqmm AL XLPE cable R AT CONDUCTOR TEMP. (3.5C x 95 SQmm AL XLPE = Cable) 0.41 X AT CONDUCTOR TEMP. (3.5C x 95 Qmm AL XLPE = Cable) 0.0724 COSø = 0.8 SINø = 0.6 No of runs: = 1 (FULL LOAD CURRENT X LENGTH X % VOLTAGE DROP = IMPEDENCE)/NO OF RUNS X VOLTAGE

7 % VOLTAGE DROP

=

CABLE SIZE CHOSEN

=

581

0.64701408 3.5CX95

sq.mm Al XLPE Cable