Answer Posted / siba prasad

1.now a days synthetic insulating fluids known as ASKARELS(trade name)are used.

2.one such fluid known as PYROCLOR is extensively used due to its remarkable stability as a dielectric strength & have no detorioration through sledging,oxidation,acid & moisture formation.

i have seen one 8.4 MW synchronous motor in a plant located in bellary it is fixed with brushless rotary rectifier ,anybody can explain its start up principle

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