Answer / rajendra

not work star delta method in single phase motor because this method use in 10 hp to 25 hp 3 phase motor.

Answer / omarya

star delta method is not required in single phase motor
star & delta is used only three phase load.

Answer / william lobo

Well today we have DOL direct on line starters for upto 100 hp and more too.
So Star Delta for 1 ph motor does not arise. Question itself is wrong. No practical question.

Answer / guest

Star-Delta motor starting method is for reducing the
starting current by dividing line current with 3 square
that is considered in 3 phase only, and also most of single
phase motors are small motor having small starting current
so it is no point to reduce the starting current.

why we step down voltage level from 33kv to 11kv and 11kv to 415v.Instead we can step down voltage from 33kv to 415v directly using single transformer?

3 Answers  

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single phase for 230 then why three phase are 440 volt

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substation+ plc system

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