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Generator Neutral Grounding Resistance Sizing
3

Generator Neutral Grounding Resistance Sizing

Generator Neutral Grounding Resistance Sizing

(OP)
I have a generator 3000 kVA, 400 V, 50 Hz that requires a neutral grounding resistance for short circuit protection.

How can i size that resistor in detailed steps?

RE: Generator Neutral Grounding Resistance Sizing

(OP)
Thanks alot Slava

RE: Generator Neutral Grounding Resistance Sizing

Step one: Divide the phase to neutral voltage by the desired maximum ground fault amps. This gives you the resistance.
Step two: Multiply the voltage by the desired maximum ground fault amps. This will give you the watts that will be dissipated by the resistor under worst case conditions.

Bill
--------------------
"Why not the best?"
Jimmy Carter

RE: Generator Neutral Grounding Resistance Sizing

I think Bill got it said.  Now all you need to do is select an appropriate CT and Relay to make it work for you.

Alan

RE: Generator Neutral Grounding Resistance Sizing

There's a few IEEE standards for neutral grounding sizing for synchronous machines.  Usually shows up when you search for IEEE standards with the keyword "synchronous".

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