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?

Answers were Sorted based on User's Feedback



I have 90KW Motor 60 Hz,380V Pf 0,88. after testing the Motor without Load is the no load Current ..

Answer / linu mohan

motor full load current is 155-162A for different categories
of make;so check from which load the motor is connected
ex-compressor,pump or crusher likewise anything
1)compressor- air might have blocked in the filter due to
impurities in the air after few hrs,so motor taking high
current.
2)pump-jamming might have blocked in the filter due to
impurities in the water after few hrs,so motor taking high
current.
if the motor is kept in a closed atmospheric room then due
to heatness after few hrs motor will take full load current
&tripping occurs,so to avoid that; place an exhaust in there.

last option clear that its not a star delta feeder...


if then also problem is not solved&strikes again then it
comes under mechanical head for sure

Is This Answer Correct ?    2 Yes 0 No

I have 90KW Motor 60 Hz,380V Pf 0,88. after testing the Motor without Load is the no load Current ..

Answer / michael

the simpliest answer to your question is in this example.

example you have to lift a 10 kg of rice, you use a little strength in order to lift it, but if your tying to lift a 50 kg of rice, you will exert much effort and strength in order to lift it. it is similar to the motor. if there is higher load the current will increase in order to satisfy the load required..

Is This Answer Correct ?    1 Yes 0 No

I have 90KW Motor 60 Hz,380V Pf 0,88. after testing the Motor without Load is the no load Current ..

Answer / manish parekh

Dear Sir,
The 90KW motor FLC is approx 155Amp so the motor amp
increseing after load so load will be 100% on motor.

Is This Answer Correct ?    1 Yes 1 No

I have 90KW Motor 60 Hz,380V Pf 0,88. after testing the Motor without Load is the no load Current ..

Answer / ketan patekar

90 KW motor full load current carrying capacity is 236 ampere..
And yes when you connect load than afcourse your motor will carry ampere as per your load.
So here everything is ok.
If your motor carrying above 236 ampere current than there is some fault like your load is high or impeller or frame or design problem etc

Is This Answer Correct ?    0 Yes 0 No

Post New Answer

More Electrical Engineering Interview Questions

What happens when the polarity changes in CT? Explain briefly?

4 Answers  


what is a lightning arrester???

12 Answers   ABB, NTPC,


what is transformer

63 Answers   ABB, Advance Power Controls, CERC, Electrical, Electrical Supervisor Competency Certificate, ETA, IBM, Jindal,


what kind of material to be used after ngr unit? cu or GI

1 Answers   Michelin,


What is the difference between Zero Current Transformer and Core Balance CT ?

1 Answers  






capacitor is load free component but why ampare meter shows current when capacitor bank breaker close?

5 Answers   Bhel, OPS,


Material commonly used in making transformer core is A cast iron B mild steel C high silicom steel D high carbon steel

1 Answers  


cab we add capacitor bank with generator to improve power factor or not??????

1 Answers  


why the AC or DC motor takes high starting current?

2 Answers  


Define super node?

0 Answers  


why dc series motor has high starting torque

2 Answers  


what's the difference between ATS and AMF...??pls answer me in detail with its working principle and construction also..

3 Answers  


Categories
  • Civil Engineering Interview Questions Civil Engineering (5085)
  • Mechanical Engineering Interview Questions Mechanical Engineering (4451)
  • Electrical Engineering Interview Questions Electrical Engineering (16632)
  • Electronics Communications Interview Questions Electronics Communications (3918)
  • Chemical Engineering Interview Questions Chemical Engineering (1095)
  • Aeronautical Engineering Interview Questions Aeronautical Engineering (239)
  • Bio Engineering Interview Questions Bio Engineering (96)
  • Metallurgy Interview Questions Metallurgy (361)
  • Industrial Engineering Interview Questions Industrial Engineering (259)
  • Instrumentation Interview Questions Instrumentation (3014)
  • Automobile Engineering Interview Questions Automobile Engineering (332)
  • Mechatronics Engineering Interview Questions Mechatronics Engineering (97)
  • Marine Engineering Interview Questions Marine Engineering (124)
  • Power Plant Engineering Interview Questions Power Plant Engineering (172)
  • Textile Engineering Interview Questions Textile Engineering (575)
  • Production Engineering Interview Questions Production Engineering (25)
  • Satellite Systems Engineering Interview Questions Satellite Systems Engineering (106)
  • Engineering AllOther Interview Questions Engineering AllOther (1379)