Earth fault detection on ungrounded system
Earth fault detection on ungrounded system
(OP)
I would like to hear your comments/views on following
We have single 6.6kV distribution feeder being supplied by ungrounded source via 110 kV(ungrounded star wdg)/6.6kV(delta wdg)transformer. Although technically speaking if we have earth fault on this feeder the earth fault current would be 3 times of steady state phase to ground capacitive current as voltages of healthy phases will rise to √3 times. My question is that "can we use this rise in voltage (from VLL/√3 to VLL) for detecting earth faults on ungrounded system?
We have single 6.6kV distribution feeder being supplied by ungrounded source via 110 kV(ungrounded star wdg)/6.6kV(delta wdg)transformer. Although technically speaking if we have earth fault on this feeder the earth fault current would be 3 times of steady state phase to ground capacitive current as voltages of healthy phases will rise to √3 times. My question is that "can we use this rise in voltage (from VLL/√3 to VLL) for detecting earth faults on ungrounded system?






RE: Earth fault detection on ungrounded system
RE: Earth fault detection on ungrounded system
and only issue I see is that it's bit unreliable as it is dependent of feeder capacitance and does transposing or lack of transposing will cause any issue?
RE: Earth fault detection on ungrounded system
RE: Earth fault detection on ungrounded system