How to calculate HT XLPE CABLE for 11 kv / 433 v , 1500 kva
oil type transformer system?
plz provide step by step calculation
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Answer Posted / s.srinivasan
Generally HT cable sizing is not done based on the full
load current of the equipment but based on the prospective
fault level. For a 11kV network, generally it shall not be
less than 150sqmm XLPE.
Fault level at 11kV(furnished by respective EB)=100 MVA(say)
Details on EB's fault level can be obtained from EB.
Therefore fault current= 100*1000/(SQRT(3)*11000)
= 5.25 kA
Short circuit current rating (for 3-sec duration)of HT 11kV
XLPE cables with Alu conductor is as below:
95 sqmm: 5.16 kA
120 sqmm: 6.51 kA
150 sqmm: 8.14 kA
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