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Hai..........Can any one tell...........Why the Voltage ratings in power system are in Multiples of 11s

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Its due to the form factor (for sinusoidal waves it is 1.1)

Not actually by 11 but by 2 or by square-root of three. The reason is for simplier construction of transformers. The typical voltage rating of the transformer dictates the voltage level of the transmission and distribution system. Square-root of three on the hand is involved because of different types of transformer connection or vector group.

Not actually by 11 but by 2 or by square-root of three. The reason is for simplier construction of transformers. The typical voltage rating of the transformer dictates the voltage level of the transmission and distribution system. Square-root of three on the hand is involved because of different types of transformer connection or vector group.