Imbalance Current in Paralled Generators

[AzmiNgisok]

Hi, I've 3 set generators and 2 set need to run parallel everyday. Today I facing a problems where the current canot be balanced when I shared the loads to 2 generators. Is it due to problems on the AVR card?

 

[Guest123]

Hi.

The AVR is just that a voltage regulator. All this does is monitor the output voltage at the windings and keeps it within a set tolerance by increasing or decreasing engine speed accordingly.

What type of loading are you trying to balance?? Are there a lot of single phase loads?? it may be that you wont be able to balance them equally.

 

[AzmiNgisok]

I'm working onboard ship where the supply for all the equipment(loads) are from generators. Most of the loads is 3ph motor, lighting system and computer system. In normal condition I'll paralleling 2 gen and shared all the loads equally. This imbalance current (kw as well) only happen when I parallel gen no 1 and 2, and no 1 and 3 but no problem for gen no 2 and 3. It seems the problem is in gen no 1 or switchboard panel gen no 1.

 

[Guest123]

What instrument are you using to measure the balancing of the loading, i.e how do you know the loads are out??

Could it be the alternator on Gen 1 needs looking at??

 

[AzmiNgisok]

I'm using clamp meter to measure the current on each phase, also my switchboard have a computer system to monitoring the loads and current for each gen set. The curent values from clamp meter and monitoring system for gen no 1 are same.
As you said need to looking on alternator no 1, which part of alternator can be suspected have a problems. I've measured the insulation for the winding and it give a good insulated value.

 

[sorin]

Hy sorry for late replay...you have a problem with no.1 gen. I think you have an auto load sharing system onboard...you tried to keep manual load sharing ? Same problem ? Usually is a problem with the diesel generator as mechanics are with higher probabilitty of breakdown than alternators....check the electrical motor for diesel engine governor it is a small motor usually 24VDC or 120VAC that is keeping the same RPM of engine.