Why Is Isolated Neutral Preferred In Some Generators?

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SUMMARY

The discussion centers on the grounding practices for generators, specifically the preference for isolated neutral configurations in certain scenarios. The plant in question includes multiple generators, including 11 Waukesha gensets and a gas turbine, with a new steam turbine being added. The existing gas turbine's neutral is currently earthed against manufacturer recommendations, while the steam turbine's neutral is recommended to be earthed. The inquiry focuses on the synchronization implications of grounding versus isolated neutral configurations.

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  • Research grounding methods for generators, focusing on isolated versus earthed neutrals
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Electrical engineers, power system designers, and professionals involved in generator synchronization and grounding practices will benefit from this discussion.

SteamTurbine
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Dear engineers,

I need your help in analyzing this query:

Our plant consists of 11x 635 KW, 415V Waukesha gensets, 2 x 3.5MW,11KV wartsila gensets, 11 KV main bus for synchronization & 10 MW,11KV, 50 Hz gas turbine. The neutral of gas turbine is earthed against the manufacturers recommendations.

Now, a 2.7MV, 11KV, 50 Hz steam Turbine is being added to the system whose neutral is recommended to be earthed. but before taking this action the Neutral of existing Gas Turbine is to be un-earthed.

So, Under which conditions the Neutral of a generator should be earthed & what are the conditions when "isolated neutral" is recommended?

I am not asking from manufacturer's point of view but I am simply asking from synchronization point of view. Any questions will be welcomed!

THANKING IN ADVANCE :)
 
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Huh? I can't think of any connection to synchronization.

Grounding practices have to do with unbalanced loads, and especially short circuit conditions.
 

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