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  1. thuongvn

    Directional ground fault (67Ns) setting in ungrounded system

    I have a question regarding setting calculation for 64, 67Ns in 6kV ungrounded system. To protect ground fault of motor 340kW I use function 64, 67Ns of Relay 7SK803 (Siemens) but I don't know how to calculate setting: 1. 64 - L-Gnd voltage of faulted phase Vph min - L-Gnd voltage of unfaulted...

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