Protection Relay Testing, Setting & Commissioning
Overview
Protection relay testing verifies that protective devices in power systems operate correctly under fault conditions, ensuring grid reliability and safety by checking settings, timing, and logic, typically using secondary injection methods during commissioning, maintenance, and factory acceptance, and involves visual checks, wiring verification, functional tests (like pickup/timing), and system-level logic verification.
Applications
- Substations
- Switchboards
- Transformers
- Feeders
- Generators
Services Include:
- Review of protection schemes, single line diagrams and coordination requirements
- Verification of CT / VT ratios, polarity and secondary wiring
- Calculation and verification of relay settings based on system parameters
- Setting of overcurrent, earth fault, motor, feeder, transformer and generator protection functions
- Logic verification for interlocking, blocking, breaker failure and backup protection
- Secondary injection testing to verify pickup current and time characteristics
- Trip circuit continuity testing and end-to-end tripping verification
- Verification of alarms, indications and remote signals
- Coordination verification with upstream and downstream protection devices