ABB Relion 670 Series Product Manual page 52

Generator protection REG670 1MRK 502 074-BEN M
Version 2.2
The REX061 coupling capacitor unit grounding point and
grounding brush of the rotor shaft should be properly
interconnected.
Shunt resistor unit REX062
GUID-90D6AF74-D9AC-49B8-B2CA-8A94E58ADEA5 v2
REX062 is required since the injection is done via a
Signal Injection Transformer.
COMBIFLEX Injection equipment
GUID-BFA755D6-9CE7-4342-B4F9-4E4F525A554A v2
RXTTE4 and optional protective resistor are used to
inject fundamental frequency AC voltage into the rotor
circuit.
52 Hitachi Power Grids
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