Generator hunting when parallel

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Discussion Overview

The discussion revolves around issues related to generator performance on an AHTS vessel, specifically focusing on the phenomenon of "hunting" when generators are paralleled. Participants explore potential causes and solutions, addressing technical aspects of generator operation and control.

Discussion Character

  • Technical explanation, Debate/contested

Main Points Raised

  • One participant describes experiencing hunting when paralleling generators No. 1 and 2, suggesting a potential issue with generator No. 2.
  • Another participant inquires about the driving mechanisms of each generator, indicating a need for further technical details.
  • Suggestions are made to check the droop settings on the governors, with a hypothesis that generator No. 2 may differ from generators 1 and 3.
  • Questions are raised regarding the type of governors (mechanical or electronic) and the size of the generators, as well as the stability of frequency when running single generators.
  • Clarification is sought on the term "hunting," with one participant explaining it as the load shifting between generators.
  • Another participant echoes the request for clarification on the meaning of "hunting," indicating a shared interest in understanding the issue better.

Areas of Agreement / Disagreement

Participants express varying levels of understanding regarding the term "hunting" and its implications, but there is no consensus on the specific cause of the problem or the best approach to resolve it.

Contextual Notes

Some technical details, such as the specific configurations of the generators and the conditions under which hunting occurs, remain unclear. The discussion also lacks definitive conclusions about the effectiveness of proposed solutions.

faizmal
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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.
 
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What drives each generator?
 
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...
 
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?
 
What does "hunting" mean in this application? Surging or something like that?
 
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.
 

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