Section 23
Injection equipment hardware
GUID-FB240BDC-C357-4A77-9CD5-CA70AE6BDB2E v1
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.
23.1
Overview
23.1.1
Front view of injection unit, coupling capacitor and shunt resitor
unit
23.1.1.1
Injection unit REX060
GUID-76627CA5-9351-49BB-ABDE-81A939D12BF4 v2
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.
1MRK 502 066-UUS B
Section 23
Injection equipment hardware
1357
Technical manual
Summary of Contents for Relion 670 series
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