GE D90 Plus Instruction Manual page 599

Line distance protection system
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CHAPTER 14: TESTING
PLUS
D90
LINE DISTANCE PROTECTION SYSTEM – INSTRUCTION MANUAL
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 or heating is provided.
IO SLOT FIRMWARE MISMATCH
Description: There a firmware mismatch between the input/output card in the indicated
slot and the CPU.
Severity: Protection is not available, and relay is not operational.
If this message appears, contact GE Grid Solutions. It may be necessary to replace the
specified input/output module or update its firmware.
IR CH 1 FAIL, IR CH 2 FAIL
Description: This selftest is 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 this message appears, check the inter-relay communications wiring. If 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, replace the power supply
module.
SELF-TESTS
589

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