ABB Relion REG670, Technical Manual

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Section 22 Injection equipment hardware
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.
22.1 Overview
22.1.1 Front view of injection unit, coupling capacitor and shunt
resitor unit
22.1.1.1 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.
Local operation shall only be performed according to the operation
regulations set up by the relevant operation authority of the plant.
1MRK502052-UEN B
Section 22
Injection equipment hardware
1221
Technical manual