12.4.8 Rotor earth fault protection with RXTTE4 and general current
and voltage protection CVGAPC
Prepare the IED for verification of settings as outlined in section "Requirements" and
section
"Preparing for test" in this chapter.
12.4.8.1 Testing
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 is fed to a voltage input of the REG670 IED. The
current caused by the injection is fed to a current input of the REG670 IED via a
current transformer, which is amplifying the current ten times, as shown in figure
42.
Section 12 1MRK502053-UEN B
Testing functionality by secondary injection
146 Generator protection REG670 2.0 IEC
Commissioning manual
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