Protection Relay Test Set Specification Checklist

This checklist converts a protection philosophy into test-equipment requirements. Complete it for the actual relay fleet and schemes; do not select a platform from headline channel counts.

1. Application inventory

• List feeder, transformer, motor, bus, capacitor and interconnection schemes.
• Record CT input type and nominal current: 1 A, 5 A, low-energy analogue or Sampled Values.
• Record VT input type, nominal voltage, residual-voltage method and synchronising sources.
• Identify differential, directional, distance, frequency, autoreclose and breaker-failure functions.

2. Analogue source requirements

• State simultaneous current, voltage, VA burden, compliance voltage and phase-angle accuracy.
• Define minimum stable output for sensitive earth-fault and metering tests.
• Separate continuous output requirements from short-duration or paralleled-channel maxima.

3. Binary and timing requirements

• Count independent wet/dry binary inputs and outputs.
• Define threshold, debounce, timestamp resolution and permitted uncertainty.
• Identify the exact start/stop event for every measured operating time.

4. Digital-substation scope

• GOOSE publish/subscribe and dataset editing.
• Sampled Values generation, quality simulation and scaling verification.
• SCL import/export, VLAN priority, PRP/HSR and PTP requirements.
• Packet capture and evidence retention without uncontrolled network bridges.

5. Evidence and lifecycle

• Calibration traceability and uncertainty statement.
• Controlled settings, test-plan and result revisions.
• Offline operation, software licensing, update policy and exportable reports.
• Field weight, lead system, connector safety, transport and environmental limits.

Acceptance evidence

Witness one maximum-burden test, one low-current accuracy test, one automated multi-element test and—where applicable—one project-SCL GOOSE/SV interoperability test. Record the exact hardware, firmware, software and licence configuration.