MV grounding with 'broken/open' delta circuit
MV grounding with 'broken/open' delta circuit
(OP)
I have a HRGS system using a wye primary (star point connected to ground) and delta secondary. The three phase delta is 'open/broken' at one point and a resistor included to limit the ground fault current. The question I have is, what happens to the ground impedance if the resistor is put in series with a contactor and the contactor is opened thus there will be no current flow in the secondary circuit? How does this affect the impedance to ground and hence the potential ground fault current






RE: MV grounding with 'broken/open' delta circuit
RE: MV grounding with 'broken/open' delta circuit
Depending on where this resistor is connected between the delta system and ground, it may limit the GF current. If this is the only connection to ground in the delta system, then opening this connection with a contactor would theoretically introduce infinite impedance to ground. The only reference to ground would be capacitive coupling.
RE: MV grounding with 'broken/open' delta circuit
You might need to turn the page the other way up!?!
RE: MV grounding with 'broken/open' delta circuit
Bill
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RE: MV grounding with 'broken/open' delta circuit