MCCB & cable size calculations

Cable size calculation Max. DC resistance at 20 deg. C Plain Copper Aluminium Nominal Cross Sectional Conductor(ohm Conductor(oh area(sq.mm) /Km) m/1000m) 6 3.08 4.61 10 1.83 3.08 16 1.15 1.91 25 0.727 1.2 35 0.524 0.868 50 0.387 0.641 70 0.268 0.443 95 0.193 0.32 120 0.153 0.253

Total Resistance (Battery + Cable) [Ω]

#REF! Length of cable(m)

(Resistance)o hm/km

Total resistance

1800 40 80 90 60 70 50 60

0.153 0.727 1.15 1.15 1.15 1.15 1.15 1.15

0.2754 0.02908 0.092 0.1035 0.069 0.0805 0.0575 0.069

Loading Drop in current(A) Voltage(V)

Size used for calculation (mm^2)

Selected size

MCCB selected(in A)

120 25 16 16 16 16 16 16

120mmsq 25 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq

200 63 32 32 32 32 32 32

Pothead Yard (EL. 897 m) Pothead Yard Sub DCDB- 5 sec-1 Fire protection panel XLPE cable Protn. Panel-1 XLPE cable Protn. Panel-2 245 kV GIS protn. Panel GIS Incomer panel-1 GIS Outgoing panel-1 GIS Outgoing panel-2

35 1 3 3 3 3 3 3

9.639 0.30448 1.1022 1.1367 1.0332 1.0677 0.9987 1.0332

50 40 60 70 75

1.15 1.15 1.15 1.15 0.727

0.0575 0.046 0.069 0.0805 0.054525

3 6 3 3 5

0.9987 1.9284 1.0332 1.0677 1.649625

16 16 16 16 25

16 mmsq 16 mmsq 16 mmsq 16 mmsq 25mmsq

32 32 32 32 63

Pothead yard Sub DCDB- 5 sec-2 Bay kiosk feeder-1 Bay kiosk feeder-2 Bay kiosk feeder-3 Bay kiosk feeder-4 XLPE cable Protn. Panel-3 XLPE cable Protn. Panel-4 Emergency lighting-7 DG set local control panel SSB-4 SSB-4(A) SAB-2

1810 64 70 74 80 70 30 50 70 60 70 60

0.153 1.15 1.15 1.15 1.15 1.15 1.15 0.727 1.15 1.15 1.15 1.15

0.27693 0.0736 0.0805 0.0851 0.092 0.0805 0.0345 0.03635 0.0805 0.069 0.0805 0.069

30 3 3 3 3 5 5 5 5 1 1 6

8.3079 1.05159 1.07229 1.08609 1.10679 1.78715 1.55715 1.5664 1.78715 0.34593 0.35743 2.07558

70 16 16 16 16 16 16 25 16 16 16 16

70 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 25mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq

200 32 32 32 32 32 32 63 32 32 32 32

GIS Hall (EL. 857.50m) GIS Hall DCDB -3 Transformer hall PLC board GIS incomer panel-1 GIS incomer panel-2 GIS incomer panel-3 GIS bus coupler panel GIS outgoing panel-1 GIS outgoing panel-2 SSB-3 Emergency lighting-4 SAB-1 Electrical Testing Lab

350 110 80 60 66 100 80 100 70 70 75 50

0.268 1.15 1.15 1.15 1.15 1.15 1.15 1.15 1.15 0.727 1.15 1.15

0.0938 0.1265 0.092 0.069 0.0759 0.115 0.092 0.115 0.0805 0.05089 0.08625 0.0575

70 3 3 3 3 3 3 3 1 5 6 5

6.566 0.6609 0.5574 0.4884 0.5091 0.6264 0.5574 0.6264 0.1743 0.72345 1.0803 0.7565

70 16 16 16 16 16 16 16 16 25 16 16

70 sqmm 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 25 mmsq 16 mmsq 16 mmsq

200 32 32 32 32 32 32 32 32 63 32 32

GIS Hall DCDB -4

400

0.268

0.107

60

6.432

70

70 mmsq

200

Cooler control panel SAB-2 Auto T/f common kiosk Auto T/f protection panel Emergency lighting-6

Transformer hall PLC board GIS incomer panel-4 GIS incomer panel-5 GIS incomer panel-6 GIS outgoing panel-3 GIS outgoing panel-4 SAB-1 Emergency Lighting-5 Dead machine protn. panel-1A Dead machine protn. panel-1B Reactor protn. Panel-1A Reactor protn. Panel-1B GIS bus reactor panel

200 70 60 65 80 55 120 90 100 105 80 75 70

1.15 1.15 1.15 1.15 1.15 1.15 1.15 0.727 1.15 1.15 1.15 1.15 1.15

0.230 0.081 0.069 0.075 0.092 0.063 0.138 0.065 0.115 0.121 0.092 0.086 0.081

3 3 3 3 3 3 6 5 5 5 5 5 3

0.715 0.250 0.214 0.232 0.286 0.197 0.843 0.334 0.587 0.617 0.470 0.440 0.250

16 16 16 16 16 16 16 25 16 16 16 16 16

16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 25 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq

32 32 32 32 32 32 32 63 32 32 32 32 32

285 140 130 120 200 110 95 100 70 60 70 100 90 140 120 140 80 90 75

0.193 1.15 1.15 1.15 1.15 0.268 0.268 0.268 1.15 1.15 1.15 1.15 0.727 0.727 0.727 0.727 0.268 0.268 0.268

0.055005 0.161 0.1495 0.138 0.23 0.02948 0.02546 0.0268 0.0805 0.069 0.0805 0.115 0.06543 0.10178 0.08724 0.10178 0.02144 0.02412 0.0201

300 1 1 1 1 250 250 250 3 3 3 3 10 40 40 40 175 175 175

8.25075 0.216005 0.204505 0.193005 0.285005 21.12125 20.11625 20.45125 0.406515 0.372015 0.406515 0.510015 1.20435 6.2714 5.6898 6.2714 1.876 2.1105 1.75875

95 16 16 16 16 70 70 70 16 16 16 16 25 25 25 25 50 50 50

2x2x95 sqmm 16 mmsq 16 mmsq 16 mmsq 16 mmsq 70 mmsq 70 mmsq 70 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 25 mmsq 25 mmsq 25 mmsq 25 mmsq 2x2C 50 mmsq 2x2C 50 mmsq 2x2C 50 mmsq

630 32 32 32 32 250 250 250 32 32 32 32 63 63 63 63 250 250 250

Generator Floor (EL. 843 m) Generator Floor(Sub-DCDB-1) UAB-1 UAB-2 UAB-3 SSB-1 HP Lub Sys-1 HP Lub Sys-2 HP Lub Sys-3 Gen. Tr. Common kiosk-1 Gen. Tr. Common kiosk-2 Gen. Tr. Common kiosk-3 Reactor common kiosk Emergency lighting-2 Static Excitation Equipments-1 Static Excitation Equipments-2 Static Excitation Equipments-3 Field Flashing unit-1 Field Flashing unit-2 Field Flashing unit-3

EHG Cubicle-1 EHG Cubicle-2 EHG Cubicle-3 Fire protection panel Brake jack control panel

90 70 60 90 110

1.15 1.15 1.15 1.15 1.15

0.1035 0.0805 0.069 0.1035 0.1265

5 5 5 1 1

0.792525 0.677525 0.620025 0.158505 0.181505

16 16 16 25 16

16 mmsq 16 mmsq 16 mmsq 25 mmsq 16 mmsq

32 32 32 63 32

Generator floor(Sub-DCDB-2) UAB-4 UAB-5 UAB-6 SSB-2 HP Lub Sys-4 HP Lub Sys-5 HP Lub Sys-6 Gen. Tr. Common kiosk-4 Gen. Tr. Common kiosk-5 Gen. Tr. Common kiosk-6 Static Excitation Equipments-4 Static Excitation Equipments-5 Static Excitation Equipments-6 EHG Cubicle-4 EHG Cubicle-5 EHG Cubicle-6 Emergency lighting-3 Main DCDB Main DCDB Sec-1 Pothead yard sub DCDB-5 sec-1 GIS hall sub DCDB-3 GIS hall sub DCDB-4 Generator floor Sub DCDB-1 Generator floor Sub DCDB-2 Common auxiliary PLC board Unit Protection Panel-1 Unit Protection Panel-2

320 140 130 120 200 85 60 90 70 60 70 110 105 130 90 80 70 110

0.193 0.727 0.727 0.727 0.727 0.268 0.268 0.268 1.15 1.15 1.15 0.727 0.727 0.727 0.727 0.727 0.727 1.15

0.06176 0.10178 0.09451 0.08724 0.1454 0.02278 0.01608 0.02412 0.0805 0.069 0.0805 0.07997 0.076335 0.09451 0.06543 0.05816 0.05089 0.1265

300 1 1 1 1 250 250 250 3 3 3 40 40 40 5 5 5 10

9.264 0.16354 0.15627 0.149 0.20716 21.135 19.46 21.47 0.42678 0.39228 0.42678 5.6692 5.5238 6.2508 0.63595 0.5996 0.56325 1.8826

95 25 25 25 25 70 70 70 16 16 16 25 25 25 25 25 25 25

2x2C 95 mmsq 25 mmsq 25 mmsq 25 mmsq 25 mmsq 70 mmsq 70 mmsq 70 mmsq 16 mmsq 16 mmsq 16 mmsq 25 mmsq 25 mmsq 25 mmsq 25 mmsq 25 mmsq 25 mmsq 25 mmsq

630 32 32 32 32 250 250 250 32 32 32 63 63 63 32 32 32 63

1800 350 400 305 360 350 300 310

0.153 0.268 0.268 0.193 0.193 1.15 1.15 1.15

0.2754 0.0938 0.1072 0.058865 0.06948 0.4025 0.345 0.3565

35 70 60 300 300 3 5 5

9.639 6.566 6.432 8.82975 10.422 1.2075 1.725 1.7825

70 70 70 95 95 16 16 16

70 mmsq 70 mmsq 70 mmsq 2x2C 70 mmsq 2x2C 70 mmsq 16 mmsq 16 mmsq 16 mmsq

200 200 200 400 400 32 32 32

Unit Protection Panel-3 Unit Protection Panel-4 Unit Protection Panel-5 Unit Protection Panel-6 Field Flashing unit-1 Field Flashing unit-2 Field Flashing unit-3 Feeder Protection Panel-1 Feeder Protection Panel-2 Feeder Protection Panel-3 Feeder Protection Panel-4 Busbar protection panel Emergency lighting-1 Unit control Panel-1 Unit control Panel-2 Unit control Panel-3

320 340 300 360 215 220 225 330 340 350 360 340 150 320 340 360

1.15 1.15 1.15 1.15 0.268 0.268 0.268 1.15 1.15 1.15 1.15 1.15 0.727 1.15 1.15 1.15

0.368 0.391 0.345 0.414 0.05762 0.05896 0.0603 0.3795 0.391 0.4025 0.414 0.391 0.10905 0.368 0.391 0.414

5 5 5 5 175 175 175 10 10 10 10 10 15 5 5 5

1.84 1.955 1.725 2.07 5.04175 5.159 5.27625 3.795 3.91 4.025 4.14 3.91 1.63575 1.84 1.955 2.07

16 16 16 16 50 50 50 16 16 16 16 16 16 16 16 16

16 mmsq 16 mmsq 16 mmsq 16 mmsq 2x2C 50 mmsq 2x2C 50 mmsq 2x2C 50 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq

32 32 32 32 400 400 400 32 32 32 32 32 32 32 32 32

Main DCDB Sec-2 Pothead yard sub DCDB-5 sec-1 GIS hall sub DCDB-3 GIS hall sub DCDB-4 Generator floor Sub DCDB-1 Generator floor Sub DCDB-2 Common auxiliary PLC board Unit Protection Panel-1 Unit Protection Panel-2 Unit Protection Panel-3 Unit Protection Panel-4 Unit Protection Panel-5 Unit Protection Panel-6 Field Flashing unit-4 Field Flashing unit-5 Field Flashing unit-6 Feeder Protection Panel-1

1810 340 380 310 350 410 300 320 320 340 350 360 240 250 255 310

0.153 0.268 0.268 0.193 0.193 1.15 1.15 1.15 1.15 1.15 1.15 1.15 0.268 0.268 0.268 1.15

0.27693 0.09112 0.10184 0.05983 0.06755 0.4715 0.345 0.368 0.368 0.391 0.4025 0.414 0.06432 0.067 0.06834 0.3565

30 70 60 300 300 3 5 5 5 5 5 5 175 175 175 10

8.3079 6.3784 6.1104 8.9745 10.1325 1.4145 1.725 1.84 1.84 1.955 2.0125 2.07 5.628 5.8625 5.97975 3.565

120 70 70 70 70 16 16 16 16 16 16 16 50 50 50 16

120mmsq 70 mmsq 70 mmsq 2x2C 95mmsq 2x2C 95 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 2x2C 50 mmsq 2x2C 50 mmsq 2x2C 50 mmsq 16 mmsq

200 200 200 630 630 32 32 32 32 32 32 32 400 400 400 32

Feeder Protection Panel-2 Feeder Protection Panel-3 Feeder Protection Panel-4 Busbar protection panel Unit control Panel-4 Unit control Panel-5 Unit control Panel-6

330 340 390 70 360 340 390

1.15 1.15 1.15 1.15 1.15 1.15 1.15

0.3795 0.391 0.4485 0.0805 0.414 0.391 0.4485

10 10 10 15 5 5 5

3.795 3.91 4.485 1.2075 2.07 1.955 2.2425

16 16 16 16 16 16 16

16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq 16 mmsq

32 32 32 32 32 32 32