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what is the size of ht cable of 33kv ht line and
transformers ratings are 2.5mva and 5.5mva.please send
formula also.
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Answer Posted / eng. d
first, how will you install it?
underground direct buried, inside trenchs or above ground
any ways, the way to calculate will be done by the cable
vendor but you can do rough estimation
for 2.5 MVA transformer
= 2.5MVA/(1.73*33KV)=43 A
then cable shall be derated and much more than transformer
then we can say we select 60A cable rating
then we go to cable vendor catalog
try to see this
http://www.doncastercables.com/cableCalculator.asp
thank you
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