Generator NGR for 100% Stator E/F
Generator NGR for 100% Stator E/F
(OP)
I wonder that whether the turbo generator grounded through MV resistor can be used to detect 100% stator E/F or not ?
I have checked all my previous projects using 100% stator E/F and found that all these generators have neutral grounding transformer with resistor connected at secondary side.
Is it necessary that if the 100% stator E/F is to be adopted, the generator grounding must be done through grounding transformer ? I am using third harmonic undervoltage detection system for 100% stator E/F protection.
Thanks
I have checked all my previous projects using 100% stator E/F and found that all these generators have neutral grounding transformer with resistor connected at secondary side.
Is it necessary that if the 100% stator E/F is to be adopted, the generator grounding must be done through grounding transformer ? I am using third harmonic undervoltage detection system for 100% stator E/F protection.
Thanks






RE: Generator NGR for 100% Stator E/F
RE: Generator NGR for 100% Stator E/F
Yes, it is high resistance grounded,however in case of using medium voltage resistor, the measured voltage directly on the resistor would be VL-L/sqrt3 which is still MV voltage but the relay itself normally detect low voltage signal. This means that it is still necessary to provide neutral grounding transformer to be connected across MV resistor and relay will be connected across secondary winding of transformer. Is my understanding correct ? could you please advise?
Thank you.
RE: Generator NGR for 100% Stator E/F
If I understand right your Q., you need install VT /PT across NER .
Please see attached file, hope that help.
Good Luck.
Slava
RE: Generator NGR for 100% Stator E/F
This assumes that the generator is connected onto the system via its own transformer, of course, whereby the only earth point is the generator neutral as above.
rasevskii