Precondition for efficient and successful periodical testing is that the installation has been comprehensively tested before it has entered the commercial use, the documentation is up to date and test records from the pre-commissioning and commissioning tests are available. Periodical testing should not be seen as a reconfirmation of commission stage testing, but as a stage where the installation’s possible impaired performance is detected, documented and also corrected.
REX615 protection and control relay is a vital part of the complete protection and control scheme, but it’s not the only one. The other devices within the scheme shall be considered as well. Depending on the actual installation these might include all or just a part of the following list:
- Circuit breaker primary part
- Circuit breaker trip coils, one or several
- Measurement transformers or sensors and related wiring
- Arc flash detection sensors
- Other protection relay(s) as a part of the complete scheme
- Interpanel wiring
- Interpanel communication for binary and/or analogue signals
- DC auxiliary voltage supply
- Station level Scada/monitoring system
- Process control system
- Remote level Scada system
The following is mainly concentrating on the REX615 as a part of the overall system, but other devices will be shortly discussed where seen necessary.