GE 745 - 7.3.2 Output Relays

7–8 745 TRANSFORMER PROTECTION SYSTEM – INSTRUCTION MANUAL
LOGIC INPUTS AND OUTPUT RELAYS CHAPTER 7: COMMISSIONING
7.3.2 Output Relays
 To verify the proper functioning of the output relays, enable the Force
Output Relays function by setting:
•
S6 TESTING  OUTPUT RELAYS  FORCE OUTPUT RELAYS
FUNCTION
: Enabled
The Test Mode LED on the front of the relay will come ON,
indicating that the relay is in test mode and no longer in service.
In test mode all output relays can be controlled manually.
 Under
S6 TESTING  OUTPUT RELAYS set the FORCE OUTPUT 1 to
FORCE OUTPUT 8 setpoints to De-energized.
 Using a multimeter, check that all outputs are de-energized.
For outputs 2 to 5, the outputs are dry N.O. contacts and for outputs 6 to
8, the outputs are throw-over contacts (form-C). Output 1 is a solid state
output. When de-energized, the resistance across E1 and F1 will be
greater than 2 MΩ; when energized, and with the multimeter positive
lead on E1, the resistance will be 20 to 30 kΩ.
 Now change the
FORCE OUTPUT 1 to FORCE OUTPUT 8 setpoints to
Energized.
 Using a multimeter, check that all outputs are now energized.
 Now return all output forcing to De-energized and disable the relay
forcing function by setting
S6 TESTING  OUTPUT RELAYS  FORCE
OUTPUT RELAYS FUNCTION
to Disabled.
All the output relays should reset.