Controller unit for rotor ground fault protection (1-3 Hz)
7XT71 controller unit used conjointly with the 7XR6004 for the 1-3 Hz rotor ground fault protection in the SIPROTEC 7UM62. A low-frequency square wave voltage of approx. +/- 50 V is injected into the rotor circuit. An AC voltage or a DC voltage can be used as supply voltage.
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