Protective relay test set

Data records

• Most protection schemes are tested with three voltages and three currents; a synchro-check function needs a fourth voltage and transformer differential protection needs six currents, so sets are offered with configurable channel counts. Source: Megger application page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.channel-counts
• End-to-end testing of a communication-based protection scheme injects synchronized fault quantities at both ends of the line, with each test set locked to GPS time so that both relays see the same fault at the same instant. Source: Doble product page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.end-to-end-testing
• In a digital substation the relay's trip is a GOOSE message on the substation network rather than a contact closure, so the test set subscribes to that message to stop its timer and publishes its own messages to simulate breaker status, with messages mapped to its binary inputs and outputs from the substation configuration file or by scanning the network. Source: Megger Electrical Tester article, March 2009 edition. Verified 2026-10-27. Record instr.protective-relay-test-set.goose-monitoring
• The same set also tests measurement transducers and single- and multifunction energy meters, and simulates disturbances such as flicker, voltage dips and swells and harmonic distortion for checking power quality analyzers. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.meters-and-transducers
• A protective relay test set is a multi-phase source of voltages and currents with control of amplitude, phase angle and frequency, plus binary inputs and outputs, that simulates fault conditions at the relay terminals and times the relay's response. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.purpose
• Sets for process-bus testing publish sampled value streams that emulate merging units in place of analog current and voltage outputs, and sets with low-level analog outputs test relays with sensor inputs; time synchronization comes from a precision time protocol on the network. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.sampled-values
• A state sequencer verifies relay timing and logic by stepping through defined states of voltage and current, with transitions triggered by time or by the relay's binary outputs, and assesses pass or fail automatically. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.state-sequencer
• A test plan built once is reused across relays of the same type; the relay settings are imported into a test model so that test points defined relative to a zone or a threshold adapt when the settings change, and the report is generated automatically. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.test-automation
• Settings-based testing verifies the relay against its configured parameters: pickup and dropoff thresholds, operating times, zones and characteristics such as overcurrent time-current curves, distance zones in the impedance plane, differential restraint characteristics and reclosing sequences. Source: OMICRON product page, web page edition. Verified 2026-10-27. Record instr.protective-relay-test-set.what-is-verified