How to calculate HV Cable Sizing & what are the factors to
be considered for selection?.
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Answer Posted / ashish tiwari
The HV cbale size shall be base on the fault level on HV
side. Like 18.4KA fault current for 11 KV supply & 21.34 KA
fault current for 33 KV supply. We can calculate the HV
cable
BY USING FORMULA ISH = K x A/( sq. root of T)
Where,
ISH :SHORT CIRCUIT CURRENT IN KA (r.m.s.)
T :DURATION OF SHORT CIRCUIT CURRENT IN SECONDS
A :AREA OF ALUMINIUM CONDUCTOR IN MM2
K :IS A CONSTANT = 0.094 for aluminium
ISH x Sq.rootT 18.4 x Sq. root 1
A = ------------ = ------------
K 0.094
= 195.7 sq.mm
HENCE 3 C x 240 SQ.MM XLPE (AL) CABLE IS REQUIRED FOR
INCOMING SIDE AS WELL AS OUTGOING SIDE OF 11 KV SUPPLY.
| Is This Answer Correct ? | 32 Yes | 19 No |
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