Electric Generator

Can you put up some numbers like, generator output, desired generator output, engine rpm?

Has your load profile changed??

If the equipment or load has changed the generator may be going out with high current due to Harmonincs or poor power factor.

I would suggest you start looking at any large motors or banks of motors and check the capasitors for any that may have failed. Also check the power factor from any IT (computer loads) or fixed power factor correction equipment. Which may be causing a leading power factor.

Not all generators handle leading power factor well.

The short version is that something in the load profile has changed.

Regards,
Sapper

I think ur Genset is asking for service.

i thank there is a problem in the governer of gen.or in the electric signal which created from loadsharing device"woodward" so

1- check the loadsharing device signal to the actuator it should be vairable with load

2- check the responce of the actuator"governer" if it change in position according to this change in signal

3- check the filter of the fuel if it had a problem so the input fuel not enough to carre this load

4- check the filter of air if it need to be cleaned.

5- check the valve of fuel "on the line of fuel supply" if it stak or not fully open

6- when you loaded the gen. look to the exahoust if there are a lot of smokes so the engine need a overhaul

New generators operate at their maximum efficiency when they are new just like any other mechanical piece of equipment. As they get older they may not be able to handle the original loads due to the fact that they fall farther and farther out of tolerance parameters.

How old is your system? Has it been mechanically maintained to preform at its maximum efficiency? Has the entire electrical/mechanical system been maintained to preform an optimum level?

All depends what type of generator you have: For Standby applications or Continuos application. Usually Standby Generators will drop maximum capacity after 2 hours of Continuos operation. Drop is in the order of 20%. That's normal. But if you have a Continuos rated Generator and are facing problems with fluctuating load capacity. Start checking the most simple items as fuel supply pressure, filters, and then go forward with more complicated parts as Governor, Generator resistance, etc. Don't forget to check the Electrical Motors Nema Codes and remember to not confuse KVa from KW.

Good Luck.

Jose Quezada.

Dear Mr. Cyclo,

The Generator - Is it tripping and or is it stalling.?

If engine is stalling the fuel supply is NOT sufficient. If tripping, the P.F may be low, and hence at higher load the Line Current is more and will trip. also Governor may not allow required quantity of fuel

Further I want to supplement to the points referred by ele_eng (Post no.4)

1. Pl. Check the COMPRESSION RATIO of the Engine and compare with the value given in the Instruction Manual. If low, the engine cannot develop adequate power to take the full load. 2. Check the governor for effective working. 3. check for low P.F and add capacitor if needed.

Thanks,

DHAYANANDHAN.S

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