Txr to 11kv Ais Cab Size

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DESCRIPTION REVISIONS

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JOB No.

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DESIGN CALCULATION - MV CABLE SIZE

CODE DOC.No. 2

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2076-LT-000-EL-DC-3059-00

DESIGN CALCULATION - MV CABLE SIZING

PREPARED

DESIGN CALCULATION

MV CABLE SIZING

CHECKED

3/12/2016 SHEET

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DESIGN CALCULATION - MV CABLE SIZING

PREPARED

CHECKED

INDEX 0.0.0

SYMBOLS & UNITS

3

1.0.0

DESIGN INPUTS

4

2.0.0

ENVIRONMENTAL DETAILS

4

3.0.0

CABLE DATA

4

4.0.0

TYPE OF LAYING

5

5.0.0

CHECKING OF SHORT CIRCUIT WITHSTAND CAPABILITY

5

6.0.0

CHECKING OF THERMAL AMPACITY

5

7.0.0

CHECKING OF STEADY STATE VOLTAGE DROP

6

8.0.0

RESULT

7

9.0.0

ANNEXURE-1 : TABLE FOR ALL CABLES

8

3/12/2016 SHEET

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DOCUMENT NO 2076-LT-000-EL-DC-3059-00 PREPARED

SYMBOLS & UNITS A

Area of cross section of conductor

A1

De-rating factor for Air temperature

A2

De-rating factor for grouping

A3

De-rating factor for

Sq.mm

cosQ Power factor E/UE Earthed / un-earthed voltage rating of cable

kV

Eff

Efficiency

%

f

Supply Frequency

Hz

G1

De-rating factor for Variation in Ground temperature

G2

De-rating factor for Variation in Thermal Resistivity of soil

G3

De-rating factor for Depth of laying

G4

De-rating factor for Horizontal formation

Ic-Air

Current carrying capacity of conductor in Air

A

Ic-DR

De-rated Continuous rating of conductor

A

Ic-Gd

Current carrying capacity of conductor in Ground

A

IF

Short Circuit withstand capacity required

kA

IL

Load Current

A

Isc

Short circuit withstand current of Conductor

kA

K-Air Overall de-rating factor for Air Kd

DATE

Derating factor

K-Gd Overall de-rating factor for Ground L

Length of Cable

n

No. of runs of cables

Mtrs

P

Real Power of Load

kW

Q

Reactive Power of Load

kVAR

R

Resistance of Cable for the length selected

Ohm

Rc

AC Resistance per unit length of Cable

ohm/Km

S

Apparent Power of Load

kVA

T

Design Ambient Temperature

o

t

Duration of Fault withstand capability

seconds

V

System Voltage

Volts

Vc

Voltage Grade of Cable

Vd

Voltage drop

V

X

Reactance of of Cable for the length selected

Ohm

Xc

Inductive reactance of cable

ohm/Km

C

CHECKED

3/12/2016 SHEET

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CHECKED

3/12/2016 SHEET

DESIGN INPUTS

Load Details 1.1.1

Load Description

:

11Kv SWGR

1.1.2

Fed By

:

Transformer

Inputs 1.2.1

System Voltage

V

:

11 kV

1.2.2

Frequency

f

:

50 Hz

1.2.3

Short Circuit withstand capacity required

IF

:

31.5 kA

1.2.4

Duration of fault withstand capacity

t

:

1.2.5

Load

S

:

1.2.6

Load power factor

CosQ :

1.2.7

Length of cable

L

:

1.2.8

Efficiency

Eff

:

2.0.0

ENVIRONMENTAL DETAILS

2.1.1

Design Ambient Temperature

T

:

3.0.0

CABLE DATA

3.1.0

Voltage Rating

:

3.1.1

No. of Cores

:

3.1.2

Cross Section Area

3.1.3

Conductor Material (Copper / Aluminium)

:

Copper

3.1.4

Insulation

:

XLPE

3.1.5

Catalogue Reference

:

Polycab

3.1.6

Current carrying Capacity

3.1.7

Resistance of Conductor

A

(Refer Spec E-005, 250MVA)

1 s 20000 kVA 0.9 50 m 90.00%

50 oC

(Std Tech & Site Data -AppendixA)

6.6kV(UE)/11kV(E) 1

:

500 Sq.mm

Ic-Air

:

800 A

Table-24

Ic-Gd

:

565 A

Table-24

Rc

:

0.0468 Ohm/KM

Table-1

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DESIGN CALCULATION - MV CABLE SIZING

3.1.8

Reactance of Conductor

Xc

:

3.1.9

Short circuit withstand current of Conductor

Isc

:

3.1.10

No. of Runs selected

n

:

CHECKED

0.107 Ohm/KM 71.4 kA for 1 sec 2

3/12/2016 SHEET

Table-4 Table-2

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CHECKED

4.0.0

Type of Laying

4.1.0

Laying in Ground

4.1.1

Ground Temperature

:

45

4.1.2

Variation in Thermal Resistivity of Soil

:

150

4.1.3

Depth of Laying

:

1

m

4.1.4

Horizontal formation, No. of Cables and & space

:

4, 30

cm

4.2.0

Laid in Air

4.2.1

Air Temperature

:

50

o

4.2.2

Horizontal formation (Touching or Spacing)

:

1 Dia

4.2.3

No. of Cables and No. of Tiers

:

3, 1

5.0.0

CHECKING OF SHORT CIRCUIT WITHSTAND CAPABILITY Fault withstand capacity of cable for 1 sec

:

Duration of Fault withstand capacity of cable required

t :

Fault withstand capacity of cable for required duration

:

3/12/2016 SHEET

C

o

C

71.4 kA

(From 3.1.9)

1 sec Isc /Sqrt(t) x n

:

142.8 kA

----- (1)

IF

:

31.5 kA

----- (2)

G1

:

0.87

Table 5-1B

De-rating factor for variation in Thermal Resistivity of Soil G2

:

1

Table-5-3

De-rating factor for Depth of Laying

G3

:

0.99

Table-5-2

Horizontal formation (Touching or Spacing)

G4

:

0.72

Table-6 D

Over all derating factor for Ground

K-Gd

:

G1xG2xG3xG4xG5

Short circuit withstand capacity required

(From 1.2.3)

Since (1) is greater than (2), the cable is safe

6.0.0

CHECKING OF THERMAL AMPACITY

6.1.0

Calculation of De-rating factor for laying in Ground De-rating factor for variation in Ground Temperature

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DESIGN CALCULATION - MV CABLE SIZING

: K-Gd

:

CHECKED

0.87 x 1 x 0.99 x 0.72 0.620136

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6.3.0

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2076-LT-000-EL-DC-3059-00 PREPARED

DESIGN CALCULATION - MV CABLE SIZING

CHECKED

De-rating factor for Air Temperature

A1

:

0.9

De-rating factor for grouping

A2

:

0.96

Over all derating factor for Air

K-Air

:

A1 x A2

:

0.9 x 0.96

SHEET

K-Air

:

Ic-DR

:

Ic-Air x K-Air A

:

800 x 0.864 A

:

691 A

:

Ic-GD x K-Gd A

:

565 x 0.6201A

:

350 A

Table 5-1A

0.864

Calculation of De-rated current carrying capacity

De-rated Current Carrying capacity of Cable in Ground

Ic-DR

De-rated Current Carrying capacity of cables selected

: :

Current Carrying capacity required Load Current

IL

Minimum of Ground & Air x n 1382 A

----- (3)

:

Load Current

:

S / Sqrt(3) / V / Eff

:

20000/1.732/11/0.9

:

1166 A

----- (4)

Since (3) is greater than (4), the cable is safe 7.0.0

3/12/2016

Calculation of De-rating factor for laying in Air

De-rated Current Carrying capacity of Cable in Air

6.4.0

DATE

CHECKING OF STEADY STATE VOLTAGE DROP Steady state voltage drop

Vd

:

I (R CosQ + X SinQ)

Resistance of cable for the length selected

R

:

Rc x L / 1000 / n

:

0.0468 x 50/1000 / 2

:

0.00115 Ohm

Reactance of cable for the length selected

X

:

Xc x L / 1000 / n

:

0.107 x 50/1000 / 2

:

0.0027 Ohm

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DESIGN CALCULATION - MV CABLE SIZING

Steady state voltage drop

Percentage Voltage drop

DATE

Vd

3/12/2016

CHECKED

SHEET

:

1166( 0.00115x0.9+0.0027x0.435889894354067)

:

2.57907857 v

%VD : : :

Vd / V /1000 / 1.732 * 100 2.57907856540547/11/1000/1.732*100 0.01 %

----(5)

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Allowed voltage drop

DATE

2076-LT-000-EL-DC-3059-00 PREPARED

:

CHECKED

5 %

3/12/2016 SHEET

----(6)

Since (5) is lesser than (6), the cable is safe

11.0.0

RESULT a)

Cable Selected

:

6.6kV(UE)/11kV(E)Core x 500 Sq.mm XLPE Copper Cable

b)

No.of runs

:

2 run

c)

Maximum Voltage Drop (%)

:

0.01%

d)

SC Withstand Capability

:

142.8

kA

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Annexure-I to MV Cable Sizing Calculation Design Inputs

SI.No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

From 000SG911 000SG911 000SG911 OH-1 OH-2 OH-3 000SG911 000SG911 000CM911 000CM911 000CM911 000CM911 000CM911 000CM911 000CM911

To OH line-1 OH line-2 OH line-2 000TF922 000TF922 000TF922 000CM911 000CM911 400FN020 400FN030 400FN035 400FN050 400ML010 510FN010 600FN020

Description Power supply to Transformer 000TF922 Power supply to Transformer 000TF923 Power supply to Transformer 000TF924 Power supply to Transformer 000TF922 Power supply to Transformer 000TF923 Power supply to Transformer 000TF924 Power supply to 000CM911 Power supply to 000CM912 Roller Mill Fan Roller Mill ESP ID Fan Dilution Air Recirculation Fan Primary combustion Air Fan Roller Mill First Stage Crystaliser Vent Fan Dryer Air Blower

Voltage (kV) 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5 5.5

Fault Current IF (kA) 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2

Fault w/s time (sec) 1 1 1 1 1 1 1 1 0.1 0.1 0.1 0.1 0.1 0.1 0.1

kW Rating

870 825 350 250 780 186.4 230

kVA Rating

Cable Data

Efficiency Cos Q SinQ

3000 3000 3000 3000 3000 3000 3610 3610 0 0 0 0 0 0 0

0.985 0.985 0.985 0.985 0.985 0.985 0.9 0.9 0.95 0.95 0.95 0.95 0.95 0.95 0.95

0.83 0.85 0.85 0.83 0.85 0.85 0.87 0.87 0.86 0.86 0.87 0.89 0.86 0.88 0.88

0.56 0.53 0.53 0.56 0.53 0.53 0.49 0.49 0.51 0.51 0.49 0.46 0.51 0.47 0.47

Length (m) 160 160 160 65 65 65 160 85 180 130 130 150 200 134 100

Insulation HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE HT-XLPE

SC w/s Capability SI.No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

SI.No 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

From 000SG911 000SG911 000SG911 OH-1 OH-2 OH-3 000SG911 000SG911 000CM911 000CM911 000CM911 000CM911 000CM911 000CM911 000CM911

From 000SG911 000SG911 000SG911 OH-1 OH-2 OH-3 000SG911 000SG911 000CM911 000CM911 000CM911 000CM911 000CM911 000CM911 000CM911

To OH line-1 OH line-2 OH line-2 000TF922 000TF922 000TF922 000CM911 000CM911 400FN020 400FN030 400FN035 400FN050 400ML010 510FN010 600FN020

To OH line-1 OH line-2 OH line-2 000TF922 000TF922 000TF922 000CM911 000CM911 400FN020 400FN030 400FN035 400FN050 400ML010 510FN010 600FN020

Description Power supply to Transformer 000TF922 Power supply to Transformer 000TF923 Power supply to Transformer 000TF924 Power supply to Transformer 000TF922 Power supply to Transformer 000TF923 Power supply to Transformer 000TF924 Power supply to 000CM911 Power supply to 000CM912 Roller Mill Fan Roller Mill ESP ID Fan Dilution Air Recirculation Fan Primary combustion Air Fan Roller Mill First Stage Crystaliser Vent Fan Dryer Air Blower

Description Power supply to Transformer 000TF922 Power supply to Transformer 000TF923 Power supply to Transformer 000TF924 Power supply to Transformer 000TF922 Power supply to Transformer 000TF923 Power supply to Transformer 000TF924 Power supply to 000CM911 Power supply to 000CM912 Roller Mill Fan Roller Mill ESP ID Fan Dilution Air Recirculation Fan Primary combustion Air Fan Roller Mill First Stage Crystaliser Vent Fan Dryer Air Blower

Cable w/s 1s 57.10 57.10 57.10 57.10 57.10 57.10 34.30 34.30 13.60 13.60 10.00 10.00 13.60 10.00 10.00

Rc1 (pu) 0.009632 0.009632 0.009632 0.003913 0.003913 0.003913 0.00772 0.004101 0.04446 0.03211 0.04459 0.05145 0.0494 0.045962 0.0343

Cable w/s for t 57.10 57.10 57.10 57.10 57.10 57.10 68.60 68.60 43.01 43.01 31.62 31.62 43.01 31.62 31.62

26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2 26.2

Result

G1

Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass

Steady State Voltage Drop Voltage Allowed %VD Xc1 (pu) Drop %VD 0.01264 4.81014 0.05% 5% 0.01264 4.74653 0.05% 5% 0.01264 4.74653 0.05% 5% 0.00514 1.95412 0.02% 5% 0.00514 1.92828 0.02% 5% 0.00514 1.92828 0.02% 5% 0.0068 3.80614 0.04% 5% 0.00361 2.02201 0.02% 5% 0.0171 6.29939 0.07% 5% 0.01235 4.31424 0.05% 5% 0.013 2.41129 0.03% 5% 0.015 1.96027 0.02% 5% 0.019 6.27525 0.07% 5% 0.0134 1.31476 0.01% 5% 0.01 1.21067 0.01% 5%

0.87 0.87 0.87 0.87 0.87 0.87 0.87 0.87

Result Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass

G2 1.00 1.00 1.00 1.00 1.00 1.00 1.00 1.00

G3 0.99 0.99 0.99 0.99 0.99 0.99 0.99 0.99

G4 0.72 0.72 0.72 0.72 0.72 0.72 0.72 0.72

Type 3Cx400 3Cx400 3Cx400 3Cx400 3Cx400 3Cx400 3Cx240 3Cx240 3Cx95 3Cx95 3Cx70 3Cx70 3Cx95 3Cx70 3Cx70

Runs 1 1 1 1 1 1 2 2 1 1 1 1 1 1 1

Grd. 517 517 517 517 517 517 387 387 237 237 202 202 237 202 202

Thermal Ampacity Derating-Air

De-rating factor for Ground Reqd.

Type of Laying

K-Gd 0.62 0.62 0.62 0.62 0.62 0.62 0.62 0.62

A1

A2 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90 0.90

0.96 0.96 0.96 0.96 0.96 0.96 0.68 0.68 0.68 0.68 0.68 0.68 0.68 0.68 0.68

Air 602 602 602 602 602 602 442 442 257 257 217 217 257 217 217

Rac / Km 0.0602 0.0602 0.0602 0.0602 0.0602 0.0602 0.0965 0.0965 0.247 0.247 0.343 0.343 0.247 0.343 0.343

Ground X / Grd. Ther Dept km Temp mal h 0.079 45 Resis 150 1 t. 0.079 45 150 1 0.079 45 150 1 0.079 45 150 1 0.079 45 150 1 0.079 45 150 1 0.085 45 150 1 0.085 45 150 1 0.095 0.095 0.1 0.1 0.095 0.1 0.1

Derated Current K-Air Grd 0.86 0.86 0.86 0.86 0.86 0.86 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61 0.61

321 321 321 321 321 321 480 480 0 0 0 0 0 0 0

Air 520 520 520 520 520 520 541 541 157 157 133 133 157 133 133

Final 321 321 321 321 321 321 480 480 157 157 133 133 157 133 133

Reqd. I 319.72 319.72 319.72 319.72 319.72 319.72 378.00 378.00 134.14 127.20 53.34 37.25 120.26 28.09 34.66

Resu lt Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass Pass

Air Hor. Air Hori. Form Temp Form 5, 30 50 1t, 3 5, 30 50 1t, 3 5, 30 50 1t, 3 5, 30 50 1t, 3 5, 30 50 1t, 3 5, 30 50 1t, 3 5, 30 50 1t, 3 5, 30 50 1t, 3 50 6t, 6 50 6t, 6 50 6t, 6 50 6t, 6 50 6t, 6 50 6t, 6 50 6t, 6

Cabl es, touch 1D 1D 1D 1D 1D 1D 1D 1D Touch Touch Touch Touch Touch Touch Touch