Generator neutral grounding - Reactance type
Generator neutral grounding - Reactance type
(OP)
I am aware of high impedance grounding as most popular and current practice for generator systems in power plants. I only read about reactance grounding and resonance grounding in text books.
Today I came across a 23MW (GE-Frame V), 11kV generator that has its neutral grounded through a reactor limiting the earth fault current to a max. of 400A. The generator is connected to a 11kV SWB and directly feeds loads.
Have any one come across such practice?
Thanks in anticipation.
Today I came across a 23MW (GE-Frame V), 11kV generator that has its neutral grounded through a reactor limiting the earth fault current to a max. of 400A. The generator is connected to a 11kV SWB and directly feeds loads.
Have any one come across such practice?
Thanks in anticipation.






RE: Generator neutral grounding - Reactance type
All the 3 nos 30MW Generators (generating at 11kV) of CPP, Khammam Chemical Refineries is the one installation that comes to my mind immediately. E/F Current limited to 20A(!?)
Best regards
RE: Generator neutral grounding - Reactance type
Thanks for your post. Could you please tell me what is the earth fault protection provided - method, type and make of relay, setting etc.
RE: Generator neutral grounding - Reactance type
The purpose of this grounding scheme is to provide an extremely sensitive means of detecting phase-to-ground faults on the generator voltage system and to limit the fault current to a very low value so that iron burning associated with generator insulation faults to ground is minimized. Excerpt from IEEE C62.92.2-1989—Grounding of Synchronous Generator Systems.
RE: Generator neutral grounding - Reactance type
RE: Generator neutral grounding - Reactance type