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MOTOR STARTING PROBLEM ON 800 KW GENERATOR


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#1 Vistro

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Posted 16 June 2005 - 07:35 AM

I have been put a question.
The name plate ratings of squirrel cage Induction Motor are:
LINCOLN ELECTRIC COMPANY.
LINCOLN DRIPPROOF Sr. # U19408141790, CODE TV 5091,
60 HP 2930 RPM 220/380 VOLTS, 154/89 AMPS 3 PHASE, NEMA CODE G NEMA DESIGN B TIME RATING 'CONTINOUS'




Why this motor has no operational problem on utility supply, but creates an operational problem, when run on a 800 KW Diesel Generator. The total running load on the generator is in the range of 350-450 KW.

#2 jraef

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Posted 18 June 2005 - 08:20 PM

Hello Vistro,
I would be happy to help if I can, but I will need to know the nature of the "operational problem" of the motor when running behind the generator to be able to offer suggestions. Generally there should not be any problems, power is power, and in your application 450kW is not much of a problem for an 800kW generator. What is the motor doing differently? Is it a prblem only when starting, only when running or both?
"He's not dead, he's just pinin' for the fjords!"

#3 chaterpilar

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Posted 15 March 2006 - 07:48 AM

Vistro,

can you elaborate on "operational problem" ? Is it voltage drop when motor is started ? Is it tripping on overload? If it is driving a centrifugal pump, you can try closing the discharge valve before starting and after the motor has reached full speed open the discharge valve gradually?

Check the AVR of alternator...sometimes the blown rotating rectifiers ( 2 out of the 6 in the assembly) can cause voltage dip at starting of motors but will show no problem at steady load.


Good Luck !!

chaterpilar




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