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negative sequence Vs zero sequence for ground fault

negative sequence Vs zero sequence for ground fault

negative sequence Vs zero sequence for ground fault

(OP)
Can we use negative sequence current to detect ground faults on ungrounded system?

RE: negative sequence Vs zero sequence for ground fault

For single line-to-ground fault, the three sequence networks are in series, so I1=I2=Io= 0 for ungrounded system. In reality there is a small current due to capacitive coupling to ground.

RE: negative sequence Vs zero sequence for ground fault

(OP)
Thanks DPC,and what i understand that there won't be any sequence current to rely on for detecting ground fault (which mainly would line capacitive discharge current)

RE: negative sequence Vs zero sequence for ground fault

(OP)
What are key criterion for setting negative sequence current setting for detecting EF on grounded system? Like would tranposition of line interfere with/encroach on the setting value?

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