Answer / k.prakashchandra

% impedance = (rated current * impedance *100)/rated voltage

I have 90KW Motor 60 Hz,380V Pf 0,88. after testing the Motor without Load is the no load Current 36 A,but wenn i put load after 2 hours the current increase more than 156 A. Can anybode tell me waht is the Problem?

4 Answers   ABB,

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working principle of induction motor is similar to transformer. but what makes it to rotate? then why the transformer doesnt?

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Question about ct secondaries connections?

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if z transform lies in ROC then. a)system is stable b)inverse of system is stable c)both system and its inverse are stable.

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say a transformer is designed for 33/11kv step down with ratio 0.33 for load 1 mva. if am giving 11kv as a input that same transformer what will happen to its o/p voltage. and whether it can be operated for 500kva

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how to calculate current when LT supply 415v fed to HT Motor 6.6kv and 1120kw.

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hai iam arunkumar. i have applied for an section enginner in rrb. i want lat 5 years solved question papers. if u have please sedn it to arun30682@gmail.com

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IF i have switchgear with busbar current rating of 1000Amp 35kA then is it necessary to have outgoing breaker kA rating to be equal to busbar kA rating?

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Why we Do not connect the windings of the motor in delta? & what would happen if we do that? I mean the winding themselves not the three lines that are coming to the motor?

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what is the difference between ac and dc?

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dear all, in motor operation , motor is of 100 hp and bimetal relay setting is 130 amp, if relay is getting tripped on 120 amp balance current what can be the reason? Relay is newly replaced. I dont know but is there any frequency effect in thit case? Can frequency variation affect bimetal relay operation?

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what is the chiller and working principal

0 Answers   Blue Star,

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