Rotor ground fault protection can be integrated in the IED among all other
protection functions typically required for generator protection. How this is
achieved by using COMBIFLEX injection unit RXTTE4 is described in Instruction
1MRG001910.
11.2.2 Operation principle
11.2.2.1 Rotor ground fault
SEMOD155827-4 v2
The protection function uses injection of an ac voltage to the generator field circuit. The
COMBIFLEX voltage injection unit RXTTE4, Part No 1MRK 002 108-AB contains a voltage
transformer with a primary winding for connection to 120 or 230 V, 50 or 60 Hz supply voltage.
From the secondary winding of this internal voltage transformer approximately 40 V AC is injected
via series capacitors and resistors into the rotor circuit. The injected voltage and current are fed to
one voltage input and one current input on the IED.
1A rated current input into REG670 must be used for this function.
The current caused by the injection is fed to a current input on the IED via injection unit RXTTE4, as
shown in figure 383.
1MRK 502 066-UUS B Section 11
Multipurpose protection
715
Technical manual
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