Earth Fault Detection
Earth Fault Detection
(OP)
With a 3-phase Delta(HV)-Star(LV) transformer with the Star point connected to earth, what fault current would flow in the HV side for a line-to-earth fault on the LV side?
Would overcurrent or earth fault relays on the HV side detect the fault?
Would overcurrent or earth fault relays on the HV side detect the fault?






RE: Earth Fault Detection
An earth fault relay on the HV side would not see the fault, however an overcurrent relay might see it, depending on the amount of current.
RE: Earth Fault Detection
There will be no ground current on the primary, only phase current, so any ground fault protection on the primary will not see the fault.