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8/6/2019 7271024 Motor Feeder Cable Voltage Drop
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PROJECT: VSP BF-3 DOCUMENT NO REV DATE
E 23/10/2008
LT CABLE SIZING CALCULATION
DESIGNED CHECKED SHEET
TITLE: ACH MMR A4
### kw MCC-WT PROX. LENG 210m
Parameter Basis / Formula Used Value Unit Symbol
Motor rating / Total Load 15 15 Kw Mr
Demand Factor Assumed 1 FConsumed Load Mr / F 15 Kw Mc
Refer motor catalogue 0.83
0.56
Assumed 0.30
0.95
Consumed Load Efficiency Refer motor catalogue 0.9
Load in kVA 20.08 kVA P
System Voltage 415 Volts V
Sytem Voltage for calculation Vs= V X (1 - 0.60%) 412.51 Volts Vs
Full Load Current (P x 1000) / (1.732 x Vs) 28.11 Amps I flc
Temperature Deration (refer Table - A) 0.9 TDF
Grouping Deration (refer Table - B) 0.68 GDF
Other Derating Factor 1 RDF
Total Derating Factor TDFx GDF x RDF 0.61 DF
Running Current after derations I flc / DF 45.92 Amps Ir
Current carrying capacity(refer catalogue) 63 Amps Ic
3cx25 PVC AL
No. of Runs of cable Ir / Ic 0.73
No. of runs of selected cable 1 No. N
Using 210 Mtr cable, Actual % Voltage drop w.r.t 415V = 3.08% 3.68in 5% voltage dro
Check for voltage drop
Allowable voltage drop (%) starting 15 % %Vdsa
Allowable voltage drop (%) running 4.40 % %VdraAllowable 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 202.36 Amps Is
Max. length for starting condition 336 Mtrs
Max. length for running condition 298 Mtrs
Hence, Cable Size Selected (As per Calculation) 1 3cx25 PVC AL
Table - A (Temp. Derating factor) Table - B (Grouping factor)
Deg C PVCNo. of Trays
1 2 3 4 6 8
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
45 0.9 0.94 0.95 0.95 0.98 5 0.77 0.73 0.7 0.69 0.68 0.67
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
1 R- 3cx25 Sqmm is found to be OK.
BLT HydraulicSystem- FillingPump
SOURCE:
Running cos (consumed load) cos r
Running sin sin r
Starting cos cos s
Starting sin sin s
r
Mc / (cos r x r)
(Vdsa x N) / (1.732 x Is x (Rcos s + Xl sin
s))(Vdra x N) / (1.732 x Ir x (Rcos r + Xl sin
r))
HRPVC
LTXLPE
HTXLPE
EPRCSP
No. ofcables/ tray
Note:A) As per above calculation, the Cable Size of
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GN-ST-06(Design Sheet)
(i) Two formats of design sheets are enclosed. These sheets can be used as per the
(ii) The designed and checked columns of design sheet shall have the signature oresponsible for design & checking respectively.
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convenience.
f the person
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STANDARD MOTOR RATINGS FLPF 3/4THPF FLEFF 3/4THEFF
1 0.18 0.65 0.58 0.5 0.46
2 0.22 0.6 0.55 0.58 0.53
3 0.37 0.64 0.58 0.65 0.58
4 0.55 0.7 0.64 0.72 0.67
5 0.75 0.7 0.65 0.74 0.69
6 1.1 0.76 0.7 0.75 0.77 1.5 0.79 0.72 0.77 0.72
8 2.2 0.82 0.76 0.8 0.75
9 3.7 0.83 0.78 0.82 0.81
10 5.5 0.84 0.79 0.85 0.83
11 7.5 0.85 0.81 0.87 0.87
12 9.3 0.85 0.81 0.88 0.88
13 11 0.85 0.82 0.89 0.89
14 15 0.86 0.83 0.9 0.9
15 18.5 0.86 0.84 0.91 0.91
16 22 0.87 0.84 0.91 0.91
17 30 0.89 0.86 0.92 0.92
18 37 0.9 0.89 0.93 0.93
19 45 0.9 0.89 0.93 0.93
20 55 0.86 0.82 0.94 0.94
21 75 0.89 0.88 0.94 0.94
22 90 0.9 0.86 0.95 0.95
23 110 0.9 0.86 0.95 0.95
24 132 0.9 0.86 0.95 0.95
25 160 0.9 0.86 0.95 0.95
26 180 0.9 0.86 0.95 0.95
27 200 0.9 0.86 0.96 0.96
28 225 0.87 0.82 0.95 0.94
29 250 0.87 0.82 0.95 0.94
SYSTEM VOLTAGE
1 240
2 415
3 1100
4 3300
5 6600
6 11000
7 33000
1 2 3 4 5 6
CABLE DATA
CURRENT RATING AT 40 DE
X-SECTION PVC HRPVC LT X
AL CU AL CU AL
1 3cx1.5 14 17 16 21
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2 3cx2.5 18 24 22 29
3 3cx4 23 30 28 37 31
4 3cx6 30 39 37 48 50
5 3cx10 39 57 49 63 67
6 3cx16 50 65 62 81 70
7 3cx25 63 66 85 110 96
8 3cx35 77 110 105 134 1179 3cx50 95 135 128 165 142
10 3cx70 130 155 159 201 179
11 3cx95 155 200 189 244 221
12 3cx120 180 230 220 281 257
13 3cx150 205 255 250 323 292
14 3cx185 240 305 293 372 337
15 3cx225 255 335 323 407 379
16 3cx240 280 355 342 433 399
17 3cx300 315 400 384 488 455
18 3cx400 375 455 458 555 530
19 3cx500 425 521 519 635 612
20 3cx630 480 674 586 759 707
21 1cx120 220 280 268 342 268
22 1cx150 250 320 305 390 309
23 1cx185 290 370 354 451 360
24 1cx225 315 400 390 483 408
25 1cx240 335 425 409 519 433
26 1cx300 380 475 464 580 501
27 1cx400 435 550 531 671 596
28 1CX500 480 590 586 720 693
29 1cx630 550 660 671 805 814
current rating
CABLE TYPE AL CU1 PVC 63 66
2 HRPVC 85 110
3 LT XLPE 96 108
4 HT XLPE 100 115
5 EPR CSP 0 113.98
CONDUCTOR current
1 AL 63
2 CU 66
1 2 3 4 5 6
CABLE DATA
CONDUCTOR RESISTA
X-SECTION PVC HRPVC LT X
AL CU AL CU AL
1 3cx1.5 21.747 14.480 21.720 12.200 23.170
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2 3cx2.5 14.538 8.870 14.520 7.560 15.500
3 3cx4 8.903 5.520 8.890 4.700 9.480
4 3cx6 5.539 3.685 5.530 3.110 5.900
5 3cx10 3.701 2.190 3.700 1.840 3.940
6 3cx16 2.295 1.376 2.290 1.160 2.440
7 3cx25 1.442 0.870 1.440 0.734 1.540
8 3cx35 1.043 0.627 1.042 0.529 1.1109 3cx50 0.770 0.463 0.770 0.391 q
10 3cx70 0.532 0.321 0.532 0.270 0.567
11 3cx95 0.384 0.231 0.385 0.195 0.410
12 3cx120 0.304 0.183 0.304 0.154 0.324
13 3cx150 0.248 0.148 0.248 0.126 0.264
14 3cx185 0.197 0.119 0.198 0.100 0.210
15 3cx240 0.150 0.090 0.152 0.076 0.160
16 3cx300 0.120 0.072 0.122 0.061 0.128
17 3cx400 0.094 0.056 0.096 0.048 0.100
18 3cx500 0.073 0.044 0.076 0.037 0.077
19 3cx630 0.056 0.034 0.061 0.029 0.060
20 1cx120 0.304 0.154 0.324
21 1cx150 0.248 0.126 0.264
22 1cx185 0.198 0.100 0.210
23 1cx225 0.171 0.850 0.180
24 1cx240 0.152 0.076 0.160
25 1cx300 0.122 0.061 0.128
26 1cx400 0.096 0.048 0.100
27 1CX500 0.076 0.037 0.077
28 1cx630 0.061 0.029 0.060
1 2 3 4 5 6
CABLE DATA
CONDUCTOR REACT
X-SECTION PVC HRPVC LT X
AL CU AL CU AL
1 3cx1.5 0.126 0.119 0.092 0.109 0.107
2 3cx2.5 0.119 0.115 0.087 0.105 0.099
3 3cx4 0.116 0.112 0.081 0.101 0.093
4 3cx6 0.110 0.104 0.073 0.095 0.088
5 3cx10 0.100 0.099 0.064 0.089 0.084
6 3cx16 0.097 0.090 0.055 0.086 0.081
7 3cx25 0.097 0.088 0.054 0.084 0.081
8 3cx35 0.097 0.086 0.050 0.082 0.078
9 3cx50 0.094 0.086 0.050 0.079 0.07510 3cx70 0.090 0.083 0.046 0.076 0.074
11 3cx95 0.090 0.083 0.043 0.076 0.072
12 3cx120 0.087 0.082 0.042 0.074 0.071
13 3cx150 0.087 0.082 0.042 0.074 0.072
14 3cx185 0.087 0.082 0.042 0.074 0.072
15 3cx240 0.087 0.079 0.041 0.073 0.071
16 3cx300 0.086 0.079 0.040 0.073 0.071
17 3cx400 0.086 0.079 0.040 0.073 0.070
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18 3cx500 0.079 0.079 0.040 0.073 0.070
19 3cx630 - - 0.040 0.725 0.070
20 1cx120 0.087 0.074 0.080 0.074 0.097
21 1cx150 0.086 0.074 0.082 0.074 0.094
22 1cx185 0.085 0.074 0.079 0.074 0.093
23 1cx225 0.084 0.074 0.077 0.074 0.091
24 1cx240 0.083 0.073 0.075 0.073 0.09025 1cx300 0.083 0.073 0.072 0.073 0.088
26 1cx400 0.082 0.073 0.070 0.073 0.087
27 1CX500 0.081 0.073 0.069 0.073 0.086
28 1cx630 0.081 0.725 0.067 0.725 0.084
resistance
CABLE TYPE AL CU
1 PVC 1.44 0.87
2 HRPVC 1.44 0.73
3 LT XLPE 1.54 0.93
4 HT XLPE 1.54 0.93
5 EPR CSP 0 0.8
CONDUCTOR res.
1 AL 1.44
2 CU 0.87
reactance
CABLE TYPE AL CU
1 PVC 0.1 0.09
2 HRPVC 0.05 0.08
3 LT XLPE 0.08 0.08
4 HT XLPE 0.12 0.12
5 EPR CSP 0 0.09
CONDUCTOR reac.
1 AL 0.1
2 CU 0.09
NO. OF RUNS
1 1
2 2
3 3
4 4
5 5
6 6
7 7
8 8
9 9
10 10
11 11
12 12
13 13
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14 14
15 15
16 16
17 17
18 18
19 19
20 20
1 MCC-MUDGUN 0.79 0.01
2 MCC-BF-BLT 0.59 0.01
3 MCC-GC 0.82 0.01
4 MCC-HS 0.65 0.01
5 MCC-TRT 1.35 0.01
6 MCC-PCI-1 0.88 0.01
7 MCC-PCI-2 0.95 0.01
8 MCC-PCI-COM 1.17 0.01
9 MCC-FF 1.62 0.02
10 MCC-CHILLER 1.65 0.02
11 MCC-SGPN 0.88 0.01
12 MCC-SGP-COM1 0.76 0.01
13 MCC-SGP-COM2 0.76 0.01
14 MCC-SGPS 0.66 0.01
15 MCC-CH-DED 0.64 0.01
16 MCC-WS1 0.55 0.01
17 MCC-WS2 0.74 0.01
18 MCC-WT 0.6 0.01
19 MCC-SH-1 0.42 0
20 MCC-SH-2 0.36 021 MCC-SH-COM 0.76 0.01
22 MCC-SH-DED 0.59 0.01
23 EME-MCC-BF 0.58 0.01
24 EME-MCC-PH 0.54 0.01
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7 8 9 10
G (LAID IN TUNNEL)
LPE HT XLPE -upto 6.6kv(E) EPR CSP
CU AL CU CU
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26
36 35
47 46
62 64
79 85
108 100 115 114
132 121 140 140162 145 175 175
198 181 215 216
240 221 255 260
276 254 290 303
318 290 335 349
366 330 370 398
402 369 415 372
426 390 440 348
480 450 505 325
546 525 600 304
612 609 714 284
685 706 850 265
336 277 368 299
384 318 422 343
444 370 490 391
479 412 547 366
510 440 580 342
570 509 665 320
660 600 805 299
708 700 900 279
825 817 1030 261
7 8 9 10
NCE AT 70 DEG
LPE HT XLPE -upto 6.6kv(E) EPR CSP
CU AL CU CU
15.500
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9.480 8.210
5.900 5.090
3.940 3.390
2.340 1.950
1.470 1.240
0.930 1.540 0.930 0.795
0.671 1.110 0.671 0.5650.495 0.820 0.495 0.393
0.343 0.567 0.343 0.277
0.247 0.410 0.247 0.210
0.196 0.324 0.196 0.164
0.159 0.264 0.159 0.132
0.127 0.210 0.127 0.108
0.096 0.160 0.096 0.082
0.077 0.130 0.077 0.065
0.060 0.100 0.060 0.040
0.047 0.077 0.047 0.039
0.036 0.060 0.036 0.031
0.196 0.324 0.196 0.164
0.159 0.264 0.159 0.132
0.127 0.210 0.127 0.108
0.107 0.180 0.110 0.093
0.096 0.160 0.096 0.082
0.077 0.130 0.077 0.065
0.060 0.100 0.060 0.040
0.047 0.077 0.047 0.039
0.036 0.060 0.036 0.031
7 8 9 10
NCE AT 50 Hz
LPE HT XLPE -upto 6.6kv(E) EPR CSP
CU AL CU CU
0.107 0.116
0.099 0.109
0.093 0.106
0.088 0.100
0.084 0.096
0.081 0.091
0.081 0.116 0.116 0.088
0.078 0.111 0.111 0.086
0.075 0.104 0.104 0.0820.074 0.100 0.100 0.079
0.072 0.095 0.095 0.077
0.071 0.092 0.092 0.076
0.072 0.089 0.089 0.076
0.072 0.087 0.087 0.076
0.071 0.085 0.085 0.075
0.071 0.082 0.082 0.075
0.070 0.079 0.079 0.075
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0.070 0.073 0.073 0.075
0.070 0.068 0.068 0.074
0.097 0.092 0.092 0.075
0.094 0.089 0.089 0.075
0.093 0.087 0.087 0.075
0.091 0.086 0.086 0.075
0.090 0.085 0.085 0.0740.088 0.082 0.082 0.074
0.087 0.079 0.079 0.074
0.086 0.073 0.073 0.074
0.084 0.068 0.068 0.073
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