Ungrouded Wye Capacitor Bank Protection
Ungrouded Wye Capacitor Bank Protection
(OP)
We are going to purchase the PF correction capacitor banks 13.8kV, 4800kVAR) with ungrounded wye configuration (single wye) with unbalanced voltage protection, and the system grounding is low impedance grounding (400A).
MY client have a concern that capacitive charging currents (circulating current) would be resulting in misoperation of ground OC relay.
I belive it would not be a problem since GF relay setting of 10% of 400A (40A), and the capacitive charging current on system would be ignorable.
Would anybody advise on the GF protection on ungrounded wye capacitor bank?
Thanks in advance.
MY client have a concern that capacitive charging currents (circulating current) would be resulting in misoperation of ground OC relay.
I belive it would not be a problem since GF relay setting of 10% of 400A (40A), and the capacitive charging current on system would be ignorable.
Would anybody advise on the GF protection on ungrounded wye capacitor bank?
Thanks in advance.






RE: Ungrouded Wye Capacitor Bank Protection
Thanks in advance for any advices.
RE: Ungrouded Wye Capacitor Bank Protection
respectfully
RE: Ungrouded Wye Capacitor Bank Protection
ht
RE: Ungrouded Wye Capacitor Bank Protection
The Star point is not grounded when you don't want to burden the capacitors with hamonic load.
The neutral displacement protection works but needs to be time delayed sufficiently to prevent operation during earth faults elsewhere in the system.