What will be the average KVA rating of Auto Transformer
for 75kw 415V , 3phase induction motor
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Answer / arulkumaran
POWER FACTOR = 0.85 (APP)
KVA = KW/PF
KVA = 75/0.85
KVA = 88.235
SO,average kva of auto transformer 90KVA (APP)
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motor rating in kva = 75/0.5=150kva
so the apparent power is let 200kva.
Keeping the starting condition and fault conditions like
overload,single phasing etc. I suggest 200x3=600kva or
750kva a standard value for the motor of 75kw,supposing that
transformer ration is 1:1.
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