Answer / prashant soni

HT Cable size dependson fault level to be withstood and its duration..

If you take XLPE, HT Cable of ALU conductor,
condiering 350MVA for 1 sec *(18.37kA), min. C/A will be found out by Area(A) = (Short ckt current (kA)*Square root of Time)/k
k is constant = 0.094 for XLPE ALu conductor.

This will give you min. size required for HT system (11/22/33/6.6/3.3kV)

Choose nearest standard higher size for HT Cable..
primary 3*240 sqmm AL cable

Answer / ahmed

how many cable shoul be connected for 2000kva transformer of 11kv.

primary 3*240 sqmm AL cable


Secondry 4*630 sqmm AL / single phase (L1,L2,L3 & L4)
(u1,u2,u3 & u4) R-Phase
(v1,v2,v3 & v4) Y-Phase
(w1,w2,w3 & w4) B-Phase

(N1,N2,N3 & N4) Neutral

Answer / upen

250sqmm

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