ABB RELION 670 Series Technical Manual page 1363

Generator protection

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1MRK 502 066-UUS B

This chapter describes the hardware equipment used for sensitive rotor earth fault protection and

100% stator earth fault protection by injection. The descriptions includes diagrams from different

elevations indicating the location of connection terminals and modules as well as dimensions and

drilling plan.

Front view of injection unit, coupling capacitor and shunt resitor

Injection unit REX060

The injection unit REX060 is used to inject voltage and current signals to the generator or motor

stator and rotor circuits. REX060 generates two square wave signals with different frequencies for

injection into the stator and rotor circuits respectively. The response from the injected voltage

and currents are then measured by the REX060 unit and amplified to a level suitable for the analog

voltage inputs of IED.

For local operation, the REX060 unit is provided with a control panel on the front.

Technical manual

Injection equipment hardware

Local operation shall only be performed according to the operation regulations set

up by the relevant operation authority of the plant.

Injection equipment hardware

GUID-FB240BDC-C357-4A77-9CD5-CA70AE6BDB2E v1

GUID-76627CA5-9351-49BB-ABDE-81A939D12BF4 v2

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