624
D90
PLUS
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
SELF-TESTS
CHAPTER 14: TESTING
FRONT PANEL MISMATCH
Description: The order code does not match the front panel type.
Severity: Protection is available.
If this message appears, update the order code to clear the self-test error.
FRONT PANEL TROUBLE
Description: An error has been encountered on the front panel.
Severity: Protection is available.
If this message appears, update the order code to clear the self-test error.
HIGH TEMPERATURE
Description: The ambient temperature is outside the specifications.
Severity: Relay remains operational.
If this message appears, ensure proper ventilation is provided.
IR CH 1 FAIL
IR CH 2 FAIL
Description: These self-tests are caused by any one of the following: low Rx power (fiber
option only), loss of signal alarm for fiber and G.703 options or RS422 clock problem (no
clock or incorrect clock), yellow bit alarm (C37.94 option only), optical transceiver SPI
interface failure (fiber option only), or Tx Fault (transmitter failure, monitored by the
transceiver).
Severity: Protection is available. Timestamping of events may not be accurate.
If either of these messages appear, check the inter-relay communications wiring. If the
failure persists, then contact the factory.
IRIG-B FAILURE
Description: The IRIG-B input signal is not present.
Severity: Protection is available. Timestamping of events may not be accurate.
If this message appears, ensure that the IRIG-B receiver is operational and properly
configured. Ensure that the IRIG-B cable is connected. Check cable integrity (that is, look
for physical damage or perform a continuity test). Check the input signal level.
NON-VOLATILE DATA LOST
Description: Non-volatile data was lost.
Severity: Protection is available; however, some data loss may be encountered.
If this message appears, check all logs for lost or corrupt data. This includes the event
recorder, transient recorder, fault reports, disturbance recorder, data logger, and phasor
measurement unit recorder.
OVERFLOW RESULT
Description: An overflow error has occurred during automation logic execution.
Severity: Automation logic execution is not suspended, and protection is still available.
Automation logic implements saturated arithmetic operations. An operation resulted in
a saturated result while running automation logic. Execution continues with the
saturated result. Analyze and correct the automation logic equations.
POWER SUPPLY TROUBLE
Description: The power supply module has a problem.
Severity: Protection is available; however, power supply failure may occur. The 48 volt
supply may also be impacted.
If this message appears, check that the voltage at the power supply input is within limits.
If OK, check that the 48 volt supply is healthy. If not OK, contact GE Grid Solutions.
