Why Is Isolated Neutral Preferred In Some Generators?

If the neutral is grounded, the voltage can't change. It will be a constant.In summary, the conversation discusses the addition of a steam turbine to a system consisting of 11 Waukesha gensets, 2 Wartsila gensets, and a gas turbine. The neutral of the gas turbine is currently grounded against manufacturer recommendations and must be un-grounded before the new steam turbine is added. The conversation also touches on the conditions for grounding a generator and when an "isolated neutral" is recommended.
  • #1
SteamTurbine
1
0
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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  • #2
Huh? I can't think of any connection to synchronization.

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

1. Why is an isolated neutral preferred in some generators?

An isolated neutral refers to a generator that has its neutral wire separated from the ground. This means that the neutral is not connected to the ground or any other conductive surface. This is preferred in some generators because it allows for better control and protection of the electrical system. It also reduces the risk of electrical shocks and fires.

2. What are the benefits of an isolated neutral?

There are several benefits of an isolated neutral in generators. Firstly, it allows for better control of the electrical system, as any faults or issues can be easily identified and addressed. Additionally, it reduces the risk of electrical shocks and fires by preventing stray currents from flowing into the ground. It also helps to improve the overall safety of the generator and its operators.

3. Are there any disadvantages to using an isolated neutral in generators?

While there are many benefits to using an isolated neutral, there are also some disadvantages. One potential issue is that the isolation of the neutral can make it more difficult to detect and troubleshoot ground faults. Additionally, an isolated neutral may also require more complex grounding systems and equipment, which can increase costs.

4. Can a generator be converted to have an isolated neutral?

In most cases, it is possible to convert a generator to have an isolated neutral. However, it is important to consult with a qualified electrician or engineer before making any modifications to a generator. They will be able to assess the feasibility and safety of converting to an isolated neutral and provide guidance on the proper procedures and equipment needed.

5. How does an isolated neutral affect the performance of a generator?

An isolated neutral does not significantly affect the performance of a generator. However, it can improve the safety and control of the electrical system. Additionally, it may require some adjustments to the grounding system and may slightly increase costs. Overall, the benefits of an isolated neutral outweigh any potential impact on performance.

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