why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtr

why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtroot3=6.35 kv and it is multiplied with sqrt2 ie 6.35 KV*sqrt2=8.9 kv we will select 9kv.my question is why we are multiplying with sqrt 2?

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why square root 2 is multiplied with line voltage in selection of LA ie 11/sqrtroot3=6.35 kv and it ..

Answer / k.prakashchandra

It is known to almost all elect engineers that Peak value / Rms value = root 2

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