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20 Hz band pass for 100 % stator ground fault protection



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    Device with a 20 Hz band pass. It smoothes the square wave voltage of the 20 Hz generator (7XT33) and protects it against ground faults with maximum displacement voltage. At 20 Hz the series resistor is 8 Ω and at rated frequency (50/60 Hz) it is more than 100 Ω. Moreover, the device features a voltage divider for reducing the measured displacement voltage (division ratio 5:2 or 5:1) at a grounding transformer or neutral-point transformer. The external divider 3PP1336-1CZ is not applicable

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