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6 ACTUAL VALUES
6.7 SELF-TEST ERRORS
The 745 performs self-diagnostics at initialization (after power-up), and continuously thereafter (in a back-
ground task). The tests ensure that every testable unit of the hardware is functioning correctly.
ANY SELF-TEST ERROR INDICATES A SERIOUS PROBLEM REQUIRING SERVICE.
CAUTION
Upon detection of a major self-test error, the 745:
•
disables all protection functionality
•
turns on the front panel SELF-TEST ERROR indicator
•
turns off the front panel IN SERVICE indicator
•
de-energizes all output relays, including the SELF-TEST relay
•
indicates the failure by inserting an appropriate message in the target message queue
•
records the failure in the EVENT RECORDER
Upon detection of a minor self-test error, the 745:
•
turns on the front panel SELF-TEST ERROR indicator
•
de-energizes the SELF-TEST relay
•
indicates the failure by inserting an appropriate message in the target message queue
•
records the failure in the EVENT RECORDER
All conditions listed in Table 6–3: SELF-TEST ERROR INTERPRETATION cause a target message to be gen-
erated.
GE Power Management
745 Transformer Management Relay
6.7 SELF-TEST ERRORS
6.7.1 DESCRIPTION
6.7.2 MAJOR SELF-TEST ERRORS
6.7.3 MINOR SELF-TEST ERRORS
6
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