Inspecting Wiring; Sample Data Interruptions - ABB RELION 620 Series Operation Manual

1MAC456939-IB D
7.3.4.1
7.3.4.2
620 series ANSI
Operation Manual

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.

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.
Section 7
Troubleshooting
109