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mahmoud moosavi
09-14-2013 05:45 AM

Starting current of MV motor

Hi Dear friends, Problem for Starting current of MV motor(mill motor, 2.9MW, 6.3KV,rotor current:775A, rotor voltage:2770V), in this case sometimes we recorded 775A as starting current and in other times we recorded 400 A for rotor current during start and for stator the current is variable, in some case it was 85 A, and in other was larger than 400 a. this motor starts with liquid starter.
what is your idea about differentiation ? what is cause of current reduction?
is the liquid starter resistance variable during each case of start?