7.3.4 Identifying relay application problems
• Check that the function is on.
• Check the blocking.
• Check the mode.
• Check the measurement value.
• Check the connection to trip and disturbance recorder functions.
• Check the channel settings.
7.3.4.1 Inspecting wiring
The physical inspection of wiring connections often reveals the wrong connection
for phase currents or voltages. However, even though the phase current or voltage
connections to protection relay terminals might be correct, wrong polarity of one or
more measurement transformers can cause problems.
• Check the current or voltage measurements and their phase information from
Main menu/Measurements.
• Check that the phase information and phase shift between phases is correct.
• Correct the wiring if needed.
• Check the actual state of the connected binary inputs from Main menu/
Monitoring/I/O status/Binary input values.
• Test and change the relay state manually in Main menu/Tests/Binary
outputs.
7.3.4.2 Sample data interruptions
Occasionally protection relays can receive corrupted or faulty measurement data
during runtime. In these cases the operation system halts the corresponding
application execution until correct data is received. In case of permanent faults, the
measurement chain should be checked to remove the origin of the faulty
measurement data.
In case of persistent faults originating from protection relay's
internal faults, contact ABB for repair or replacement actions.
2NGA000823 A Section 7
Troubleshooting
REX610 65
Operation Manual
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