Answer / rasel-amie

HT Cable select, its depend of incoming capacity of feeder
line. say feeder capacity 100 MVA SO Calculate current I=
100*100/11*1.73=5.25kA. So we can select of HT Cable for
minimum short ckt current carrying capacity of minimum 5.2kA.

Answer / er.rupam dwivedi

A=kva x 1000/1.732x ht voltage=ht cable selection

Answer / uday

1500kVA X 0.8 PF = 1200Kw = 1200000W

P=RT3 V I COS fi

SO, P
I = -----------
RT3 x V x COSfi

1200000
I = -----------------
1.732x1100x0.8

= 79 A

Now take cable table and select the suitable xlpe cable.

Uday

Answer / govind bisht

Assume PF of transformer is .8.
rating of transformer=1500kVA=1500X.8=1200kW
V=433(3phase)
So that maximum current-
I= P/V*PF
=1200*1000/1.732*433*.=1600A
So cable size required if copper cable
1mm=4amp= 400sqmm(by consedering all factors)
For aluminium cable
1mm=2.5A=640sqmm

Answer / m.jagadeeshwar

for 11kv side current = kva*1000/1.732*11000

= 78.73 amps
for 78.73 amps 3 core 25 sqmm cable is sufficient

How to calculate cable size by using load.?? Any formula...

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