Motor Feeder Cable Voltage Drop

PROJECT:

DOCUMENT NO

VSP BF-3

DATE

REV

23/10/2008

E TITLE:

LT CABLE SIZING CALCULATION

BLT Hydraulic System- Filling Pump

### kw

SOURCE :

Parameter

DESIGNED

CHECKED

SHEET

ACH

MMR

A4

MCC-WT

APPROX. LENGTH210 m

Basis / Formula Used

Value

15

15

Demand Factor

Assumed

1

Consumed Load

Mr / F

15

Motor rating / Total Load

Unit Kw

Symbol Mr

Kw

Mc

F

0.83

cos φr

Running sin φ

0.56

sin φr

Starting cos φ

0.30

cos φs

0.95

sin φs

Running cos φ (consumed load)

Refer motor catalogue Assumed

Starting sin φ

0.9

Refer motor catalogue

Consumed Load Efficiency

Mc / (cos φr x ηr)

Load in kVA System Voltage Sytem Voltage for calculation

Vs= V X (1 0.60% ) (P x 1000) / (1.732 x Vs)

Full Load Current

ηr

20.08

kVA

415

Volts

V

412.51

Volts

Vs

28.11

Amps

P

I flc

Temperature Deration

(refer Table - A)

0.9

Grouping Deration

(refer Table - B)

0.68

TDF GDF

Other Derating Factor

1

RDF

Total Derating Factor

TDFx GDF x RDF

0.61

I flc / DF

45.92

Amps

Ir

63

Amps

Ic

Running Current after derations Current carrying capacity 3cx25

PVC

(refer catalogue)

AL

0.73

Ir / Ic

No. of Runs of cable

DF

1

No. of runs of selected cable

No.

3.08 %

Using 210 Mtr cable, Actual % Voltage drop w.r.t 415V =

N

3.68

Check for voltage drop Allowable voltage drop (%) starting

15

%

%Vdsa

Allowable voltage drop (%) running

4.40

%

%Vdra

Allowable voltage drop at starting

Vs x %Vdsa/100

61.877

Volt

Vdsa

Allowable voltage drop at running

Vs x %Vdra/100

18.150

Volt

Vdra

Max. Conductor Resistance at 70 degC

(refer cable catalogue)

1.44

Ohm / km

R

Reactance at 50 c/s

(refer cable catalogue)

0.1

Ohm / km

Xl

Running current

Full load current ( Iflc )

28.11

Amps

Ir

Starting current

7.2 x Ir (Vdsa x N) / (1.732 x Is x (Rcos φs + Xl sin φs)) (Vdra x N) / (1.732 x Ir x (Rcos φr + Xl sin φr))

202.36

Amps

Is

336

Mtrs

298

Mtrs

Max. length for starting condition Max. length for running condition

Hence, Cable Size Selected (As per Calculation) Table - A (Temp. Derating factor) Deg C PVC

HR PVC

LT XLPE

1

3cx25

6

8

AL

Table - B (Grouping factor)

HT EPR XLPE CSP

No. of cables / tray

No. of Trays 1

2

3

4

25

1.25

1.16

1.14

1.14

1.28

1

1

1

1

1

1

1

30

1.16

1.1

1.1

1.1

1.22

2

0.84

0.8

0.78

0.77

0.76

0.75

35

1.09

1.05

1.04

1.04

1.13

3

0.8

0.76

0.74

0.73

0.72

0.71

40

1

1

1

1

1

4

0.78

0.74

0.72

0.71

0.7

0.69

0.95

0.95

0.98

5

0.7

0.69

0.68

0.67

45

PVC

0.9

0.94

0.77

0.73

50

0.8

0.88

0.9

0.9

0.88

6

0.75

0.71

0.7

0.68

0.68

0.66

55

0.69

0.82

0.85

0.85

0.77

7

0.74

0.69

0.68

0.66

0.66

0.64

60

0.62

0.74

0.8

0.8

0.66

8

0.73

0.69

0.68

0.67

0.66

0.64

Note: A) As per above calculation, the Cable Size of

1 R-

3cx25 Sqmm is found to be OK.

B) In above calculation, Consumed Load have been considered as Motor rating. C) The above cable size selected for motor is based on Average length of 150 Mtr, However, the final cable sizes for individual motors shall be based on the actual cable lengths considering the voltage drop.

in 5% voltage drop

GN-ST-06(Design Sheet) Two formats of design sheets are enclosed. These sheets can be used as per the convenience (i) (ii) The ‘designed’ and ‘checked’ columns of design sheet shall have the signature of the person responsible for design & checking respectively.

as per the convenience. ignature of the person

1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

STANDARD MOTOR RATINGS 0.18 0.22 0.37 0.55 0.75 1.1 1.5 2.2 3.7 5.5 7.5 9.3 11 15 18.5 22 30 37 45 55 75 90 110 132 160 180 200 225 250

1 2 3 4 5 6 7

SYSTEM VOLTAGE 240 415 1100 3300 6600 11000 33000

FLPF 0.65 0.6 0.64 0.7 0.7 0.76 0.79 0.82 0.83 0.84 0.85 0.85 0.85 0.86 0.86 0.87 0.89 0.9 0.9 0.86 0.89 0.9 0.9 0.9 0.9 0.9 0.9 0.87 0.87

1

3/4THPF 0.58 0.55 0.58 0.64 0.65 0.7 0.72 0.76 0.78 0.79 0.81 0.81 0.82 0.83 0.84 0.84 0.86 0.89 0.89 0.82 0.88 0.86 0.86 0.86 0.86 0.86 0.86 0.82 0.82

2

FLEFF 3/4THEFF 0.5 0.46 0.58 0.53 0.65 0.58 0.72 0.67 0.74 0.69 0.75 0.7 0.77 0.72 0.8 0.75 0.82 0.81 0.85 0.83 0.87 0.87 0.88 0.88 0.89 0.89 0.9 0.9 0.91 0.91 0.91 0.91 0.92 0.92 0.93 0.93 0.93 0.93 0.94 0.94 0.94 0.94 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.95 0.96 0.96 0.95 0.94 0.95 0.94

3

4

5

6

CABLE DATA

CURRENT RATING AT 40 DEG (LAID IN TUNNEL X-SECTION 1

3cx1.5

PVC AL 14

HRPVC CU 17

AL 16

CU 21

LT XLPE AL

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29

3cx2.5 3cx4 3cx6 3cx10 3cx16 3cx25 3cx35 3cx50 3cx70 3cx95 3cx120 3cx150 3cx185 3cx225 3cx240 3cx300 3cx400 3cx500 3cx630 1cx120 1cx150 1cx185 1cx225 1cx240 1cx300 1cx400 1CX500 1cx630

18 23 30 39 50 63 77 95 130 155 180 205 240 255 280 315 375 425 480 220 250 290 315 335 380 435 480 550

24 30 39 57 65 66 110 135 155 200 230 255 305 335 355 400 455 521 674 280 320 370 400 425 475 550 590 660

1 2 3 4 5

CABLE TYPE PVC HRPVC LT XLPE HT XLPE EPR CSP

current rating AL CU 63 66 85 110 96 108 100 115 0 113.98

1 2

CONDUCTOR AL CU

22 28 37 49 62 85 105 128 159 189 220 250 293 323 342 384 458 519 586 268 305 354 390 409 464 531 586 671

29 37 48 63 81 110 134 165 201 244 281 323 372 407 433 488 555 635 759 342 390 451 483 519 580 671 720 805

31 50 67 70 96 117 142 179 221 257 292 337 379 399 455 530 612 707 268 309 360 408 433 501 596 693 814

current 63 66

1

2

3

4

5

6

CABLE DATA CONDUCTOR RESISTANCE AT 70 DEG X-SECTION 1

3cx1.5

PVC AL 21.747

HRPVC CU 14.480

AL 21.720

CU 12.200

LT XLPE AL 23.170

2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28

3cx2.5 3cx4 3cx6 3cx10 3cx16 3cx25 3cx35 3cx50 3cx70 3cx95 3cx120 3cx150 3cx185 3cx240 3cx300 3cx400 3cx500 3cx630 1cx120 1cx150 1cx185 1cx225 1cx240 1cx300 1cx400 1CX500 1cx630

14.538 8.903 5.539 3.701 2.295 1.442 1.043 0.770 0.532 0.384 0.304 0.248 0.197 0.150 0.120 0.094 0.073 0.056

1

8.870 5.520 3.685 2.190 1.376 0.870 0.627 0.463 0.321 0.231 0.183 0.148 0.119 0.090 0.072 0.056 0.044 0.034

2

14.520 8.890 5.530 3.700 2.290 1.440 1.042 0.770 0.532 0.385 0.304 0.248 0.198 0.152 0.122 0.096 0.076 0.061 0.304 0.248 0.198 0.171 0.152 0.122 0.096 0.076 0.061

3

7.560 4.700 3.110 1.840 1.160 0.734 0.529 0.391 0.270 0.195 0.154 0.126 0.100 0.076 0.061 0.048 0.037 0.029 0.154 0.126 0.100 0.850 0.076 0.061 0.048 0.037 0.029

4

15.500 9.480 5.900 3.940 2.440 1.540 1.110 q 0.567 0.410 0.324 0.264 0.210 0.160 0.128 0.100 0.077 0.060 0.324 0.264 0.210 0.180 0.160 0.128 0.100 0.077 0.060

5

6

CABLE DATA CONDUCTOR REACTANCE AT 50 Hz X-SECTION 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17

3cx1.5 3cx2.5 3cx4 3cx6 3cx10 3cx16 3cx25 3cx35 3cx50 3cx70 3cx95 3cx120 3cx150 3cx185 3cx240 3cx300 3cx400

PVC AL 0.126 0.119 0.116 0.110 0.100 0.097 0.097 0.097 0.094 0.090 0.090 0.087 0.087 0.087 0.087 0.086 0.086

HRPVC CU 0.119 0.115 0.112 0.104 0.099 0.090 0.088 0.086 0.086 0.083 0.083 0.082 0.082 0.082 0.079 0.079 0.079

AL 0.092 0.087 0.081 0.073 0.064 0.055 0.054 0.050 0.050 0.046 0.043 0.042 0.042 0.042 0.041 0.040 0.040

CU 0.109 0.105 0.101 0.095 0.089 0.086 0.084 0.082 0.079 0.076 0.076 0.074 0.074 0.074 0.073 0.073 0.073

LT XLPE AL 0.107 0.099 0.093 0.088 0.084 0.081 0.081 0.078 0.075 0.074 0.072 0.071 0.072 0.072 0.071 0.071 0.070

18 19 20 21 22 23 24 25 26 27 28

3cx500 3cx630 1cx120 1cx150 1cx185 1cx225 1cx240 1cx300 1cx400 1CX500 1cx630

0.079 0.087 0.086 0.085 0.084 0.083 0.083 0.082 0.081 0.081

1 2 3 4 5

CABLE TYPE PVC HRPVC LT XLPE HT XLPE EPR CSP

resistance AL CU 1.44 0.87 1.44 0.73 1.54 0.93 1.54 0.93 0 0.8

1 2

CONDUCTOR AL CU

1 2 3 4 5

CABLE TYPE PVC HRPVC LT XLPE HT XLPE EPR CSP

1 2

CONDUCTOR AL CU

res. 1.44 0.87 reactance AL CU 0.1 0.09 0.05 0.08 0.08 0.08 0.12 0.12 0 0.09 reac. 0.1 0.09

NO. OF RUNS 1 2 3 4 5 6 7 8 9 10 11 12 13

0.079 0.074 0.074 0.074 0.074 0.073 0.073 0.073 0.073 0.725

1 2 3 4 5 6 7 8 9 10 11 12 13

0.040 0.040 0.080 0.082 0.079 0.077 0.075 0.072 0.070 0.069 0.067

0.073 0.725 0.074 0.074 0.074 0.074 0.073 0.073 0.073 0.073 0.725

0.070 0.070 0.097 0.094 0.093 0.091 0.090 0.088 0.087 0.086 0.084

14 15 16 17 18 19 20

14 15 16 17 18 19 20

1 MCC-MUDGUN 2 MCC-BF-BLT 3 MCC-GC 4 MCC-HS 5 MCC-TRT 6 MCC-PCI-1 7 MCC-PCI-2 8 MCC-PCI-COM 9 MCC-FF 10 MCC-CHILLER 11 MCC-SGPN 12 MCC-SGP-COM1 13 MCC-SGP-COM2 14 MCC-SGPS 15 MCC-CH-DED 16 MCC-WS1 17 MCC-WS2 18 MCC-WT 19 MCC-SH-1 20 MCC-SH-2 21 MCC-SH-COM 22 MCC-SH-DED 23 EME-MCC-BF 24 EME-MCC-PH

0.79 0.59 0.82 0.65 1.35 0.88 0.95 1.17 1.62 1.65 0.88 0.76 0.76 0.66 0.64 0.55 0.74 0.6 0.42 0.36 0.76 0.59 0.58 0.54

0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.02 0.02 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0.01 0 0 0.01 0.01 0.01 0.01

7

8

9

10

NG AT 40 DEG (LAID IN TUNNEL) LT XLPE CU

HT XLPE -upto 6.6kv(E) EPR CSP AL

CU

CU

36 47 62 79 108 132 162 198 240 276 318 366 402 426 480 546 612 685 336 384 444 479 510 570 660 708 825

100 121 145 181 221 254 290 330 369 390 450 525 609 706 277 318 370 412 440 509 600 700 817

7

26 35 46 64 85 114 140 175 216 260 303 349 398 372 348 325 304 284 265 299 343 391 366 342 320 299 279 261

115 140 175 215 255 290 335 370 415 440 505 600 714 850 368 422 490 547 580 665 805 900 1030

8

9

10

R RESISTANCE AT 70 DEG LT XLPE CU 15.500

HT XLPE -upto 6.6kv(E) EPR CSP AL

CU

CU

9.480 5.900 3.940 2.340 1.470 0.930 0.671 0.495 0.343 0.247 0.196 0.159 0.127 0.096 0.077 0.060 0.047 0.036 0.196 0.159 0.127 0.107 0.096 0.077 0.060 0.047 0.036

1.540 1.110 0.820 0.567 0.410 0.324 0.264 0.210 0.160 0.130 0.100 0.077 0.060 0.324 0.264 0.210 0.180 0.160 0.130 0.100 0.077 0.060

7

8.210 5.090 3.390 1.950 1.240 0.795 0.565 0.393 0.277 0.210 0.164 0.132 0.108 0.082 0.065 0.040 0.039 0.031 0.164 0.132 0.108 0.093 0.082 0.065 0.040 0.039 0.031

0.930 0.671 0.495 0.343 0.247 0.196 0.159 0.127 0.096 0.077 0.060 0.047 0.036 0.196 0.159 0.127 0.110 0.096 0.077 0.060 0.047 0.036

8

9

10

OR REACTANCE AT 50 Hz LT XLPE CU 0.107 0.099 0.093 0.088 0.084 0.081 0.081 0.078 0.075 0.074 0.072 0.071 0.072 0.072 0.071 0.071 0.070

HT XLPE -upto 6.6kv(E) EPR CSP AL

CU

0.116 0.111 0.104 0.100 0.095 0.092 0.089 0.087 0.085 0.082 0.079

0.116 0.111 0.104 0.100 0.095 0.092 0.089 0.087 0.085 0.082 0.079

CU 0.116 0.109 0.106 0.100 0.096 0.091 0.088 0.086 0.082 0.079 0.077 0.076 0.076 0.076 0.075 0.075 0.075

0.070 0.070 0.097 0.094 0.093 0.091 0.090 0.088 0.087 0.086 0.084

0.073 0.068 0.092 0.089 0.087 0.086 0.085 0.082 0.079 0.073 0.068

0.073 0.068 0.092 0.089 0.087 0.086 0.085 0.082 0.079 0.073 0.068

0.075 0.074 0.075 0.075 0.075 0.075 0.074 0.074 0.074 0.074 0.073