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Member

Join Date: Sep 2017
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Need of Nuetral Grounding Reactor

09/26/2017 2:54 AM

Why Neutral Grounding Reactors (NGR) are required for grounding of neutral of Line reactors and the same are not needed in case of Bus Reactors in HV Substations (400 kV and 765 kV)?

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#1

Re: Need of Nuetral Grounding Reactor

09/26/2017 2:23 PM

What are the line reactors for? Power electronics?

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Participant

Join Date: Feb 2013
Location: New Zealand
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#2

Re: Need of Nuetral Grounding Reactor

09/27/2017 2:06 AM

Do you mean, Neutral Earth Resistors?

NER's are one of the commonest types of earthing systems in HV AC systems. They limit the current that would flow through the neutral point of a generator or transformer in the event of an earth fault.

Were I have worked with HV power generation we had one NER for each generator. These generators were 11kv

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Power-User

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#3
In reply to #2

Re: Need of Nuetral Grounding Reactor

09/27/2017 1:53 PM

And bus reactors are designed to limit the flow of phase current, normally to limit the magnitude of line to line faults. Nothing to do with earth reactors/resistors, except in the case where the line current must travel through the line reactor before returning to earth/power system return, then the line reactor limits the current flowing through the ground reactor...

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#4

Re: Need of Nuetral Grounding Reactor

09/28/2017 1:53 AM

http://ipstconf.org/papers/Proc_IPST2017/17IPST145.pdf

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