Maintenance; In-Service Maintenance; Out-Of-Service Maintenance; General Maintenance - GE C70 Instruction Manual

C70 Capacitor Bank Protection and Control System
Chapter 10: Maintenance

Maintenance

This chapter outlines maintenance, repair, storage, and disposal of the hardware and software.

10.1 General maintenance

The C70 requires minimal maintenance. As a microprocessor-based relay, its characteristics do not change over time.
Expected service life is 20 years for UR devices manufactured June 2014 or later when applied in a controlled indoors
environment and electrical conditions within specification.
While the C70 performs continual self-tests, it is recommended that maintenance be scheduled with other system
maintenance. This maintenance can involve in-service, out-of-service, or unscheduled maintenance.

10.1.1 In-service maintenance

1. Visual verification of the analog values integrity, such as voltage and current (in comparison to other devices on the
corresponding system).
2. Visual verification of active alarms, relay display messages, and LED indications.
3. LED test.
4. Visual inspection for any damage, corrosion, dust, or loose wires.
5. Event recorder file download with further events analysis.

10.1.2 Out-of-service maintenance

1. Check wiring connections for firmness.
2. Analog values (currents, voltages, RTDs, analog inputs) injection test and metering accuracy verification. Calibrated
test equipment is required.
3. Protection elements setting verification (analog values injection or visual verification of setting file entries against
relay settings schedule).
4. Contact inputs and outputs verification. This test can be conducted by direct change of state forcing or as part of the
system functional testing.
5. Visual inspection for any damage, corrosion, or dust.
6. Event recorder file download with further events analysis.
7. LED Test and pushbutton continuity check.
C70 CAPACITOR BANK PROTECTION AND CONTROL SYSTEM – INSTRUCTION MANUAL 10-1