Generator hunting when parallel

[faizmal]

Evening to all, I'm electrician onboard AHTS vessel. Currently I've have problem with generators onboard my vessel. For your info, we have 4 generators onboard. When paralleling with generator No. 1 and 2, the generator will be hunting if the load is low. But if running only generator 1 or 2, there are no problem. This happened also if we paralleling with 3 generators with generator no. 2. I suspected that there is a problem with generator No. 2. Hope I can get information regarding this matter. Thanks.

 

[256bits]

What drives each generator?

 

[jim hardy]

Check droop settings on governors?
Sounds like #2 is different trom 1 & 3 somehow.
Could be as simple as excess play or friction in mechanical throttle linkage...

 

[Jobrag]

What type of governors do you have mechanical or electronic?
What size are your generators?
Do you have a large load that you can switch on and off easily?
When running single generators does the frequency remain stable?

 

[psparky]

What does "hunting" mean in this application? Surging or something like that?

 

[Jobrag]

What does "hunting" mean in this application? Surging or something like that?
It means that the load is constantly shifted from one generator to another and the back again.