Protective Relay Testing & Commissioning

Relays are the last line of defense for your system. We verify settings, logic, CT/VT polarity, and trip performance so faults clear fast and coordination holds.

What We Cover

• Relay Types: Feeder, transformer differential, motor, generator, bus, distance/line, arc-flash, reclosing, sync check.
• Manufacturers: SEL (Schweitzer), GE, Schneider, Eaton, ABB/Hitachi, Basler, Siemens.
• Testing Methods: Secondary injection, element pickup/dropout, timing, harmonic restraint checks, scheme logic & interlocks.
• Settings & Coordination: Import settings, review against studies, coordination spot-checks, event record review.
• Point-to-Point: Trip circuits, lockout relays, breaker status, SCADA points, alarms/annunciators.
• Documentation: As-found/as-left settings, test sheets, event captures, one-line markups.

Commissioning Workflow

1. Pre-job package: one-line, device list, settings files, switching plan.
2. Field verification: CT/VT polarity & ratios, wiring checks, DC supply health.
3. Functional proof: element tests, logic, trip outputs and interlocks.
4. Closeout: settings archives, final report, recommendations.

Related services: Switchgear Testing and High/Medium Voltage Testing.