Generator Neutral Grounding Resistance Sizing 3

[mahmoudmaged]

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?

 

[slavag]

Hi.
For the start.
thread238-250961

http://www.greendiamond.dsskcorp.co...f Industrial and Commercial Power Systems.PDF

I would recommned to you search on the Forum too, lot of topics on the issue.
Good Luck.
Slava

 

[mahmoudmaged]

Thanks alot Slava

 

[waross]

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

 

[racobb]

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

 

[esee135]

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".