Protective Relay Reference

Test methods

Test methods applied to electrical power equipment at acceptance and in maintenance, each with its purpose, principle and the standards that govern it.

Test methods per groupProtection: 28; Control: 2; Inspection: 1; Insulation: 1; Ratio: 1; Resistance: 1Protection28Control2Inspection1Insulation1Ratio1Resistance1
Test methods per group. Entries in this family grouped by the equipment or system they apply to. Each bar links to its group below.
Test methods per group: entries per row.
CategoryCount
Protection28
Control2
Inspection1
Insulation1
Ratio1
Resistance1

Control

  1. Control and functional verification

    Control and Functional Verification is specified for electromechanical and solid-state protective relays in acceptance testing at clause 7.9.1.B.4 of ANSI/NETA ATS-2025. Value: electromechanical and solid-state protective relays.

  2. Scada and communication verification

    SCADA and Communication Verification is specified for microprocessor-based protective relays in acceptance testing at clause 7.9.2.B.10 of ANSI/NETA ATS-2025. Value: microprocessor-based protective relays.

Inspection

  1. Visual and mechanical inspection

    Visual and Mechanical Inspection is specified for low-voltage ground-fault protection systems in acceptance testing at clause 7.14.A of ANSI/NETA ATS-2025. Value: low-voltage ground-fault protection systems.

Insulation

  1. Insulation resistance

    Insulation Resistance is specified for low-voltage ground-fault protection systems in acceptance testing at clause 7.14.B.2 of ANSI/NETA ATS-2025. Value: low-voltage ground-fault protection systems.

Protection

  1. Ground fault protection performance

    Ground Fault Protection Performance is specified for low-voltage ground-fault protection systems in acceptance testing at clause 7.14.B.4 of ANSI/NETA ATS-2025. Value: low-voltage ground-fault protection systems.

  2. Protective Relay Element Tests

    Protective Relay Element Tests is addressed in ANSI/NETA ATS-2025.

  3. Relay 21 Distance Test

    Relay 21 Distance Test is addressed in ANSI/NETA ATS-2025.

  4. Relay 25 Sync Check Test

    Relay 25 Sync Check Test is addressed in ANSI/NETA ATS-2025.

  5. Relay 27 Undervoltage Test

    Relay 27 Undervoltage Test is addressed in ANSI/NETA ATS-2025.

  6. Relay 32 Directional Power Test

    Relay 32 Directional Power Test is addressed in ANSI/NETA ATS-2025.

  7. Relay 40 Loss of Field Test

    Relay 40 Loss of Field Test is addressed in ANSI/NETA ATS-2025.

  8. Relay 46 Current Balance Test

    Relay 46 Current Balance Test is addressed in ANSI/NETA ATS-2025.

  9. Relay 46n Negative Sequence Test

    Relay 46n Negative Sequence Test is addressed in ANSI/NETA ATS-2025.

  10. Relay 47 Phase Sequence Test

    Relay 47 Phase Sequence Test is addressed in ANSI/NETA ATS-2025.

  11. Relay 49r Thermal Replica Test

    Relay 49r Thermal Replica Test is addressed in ANSI/NETA ATS-2025.

  12. Relay 49t Temperature Test

    Relay 49t Temperature Test is addressed in ANSI/NETA ATS-2025.

  13. Relay 50 Instantaneous Overcurrent Test

    Relay 50 Instantaneous Overcurrent Test is addressed in ANSI/NETA ATS-2025.

  14. Relay 50bf Breaker Failure Test

    Relay 50bf Breaker Failure Test is addressed in ANSI/NETA ATS-2025.

  15. Relay 51 Time Overcurrent Test

    Relay 51 Time Overcurrent Test is addressed in ANSI/NETA ATS-2025.

  16. Relay 55 Power Factor Test

    Relay 55 Power Factor Test is addressed in ANSI/NETA ATS-2025.

  17. Relay 59 Overvoltage Test

    Relay 59 Overvoltage Test is addressed in ANSI/NETA ATS-2025.

  18. Relay 60 Voltage Balance Test

    Relay 60 Voltage Balance Test is addressed in ANSI/NETA ATS-2025.

  19. Relay 63 Sudden Pressure Test

    Relay 63 Sudden Pressure Test is addressed in ANSI/NETA ATS-2025.

  20. Relay 64 Ground Detector Test

    Relay 64 Ground Detector Test is addressed in ANSI/NETA ATS-2025.

  21. Relay 67 Directional Overcurrent Test

    Relay 67 Directional Overcurrent Test is addressed in ANSI/NETA ATS-2025.

  22. Relay 79 Reclosing Test

    Relay 79 Reclosing Test is addressed in ANSI/NETA ATS-2025.

  23. Relay 81 Frequency Test

    Relay 81 Frequency Test is addressed in ANSI/NETA ATS-2025.

  24. Relay 85 Pilot Wire Monitor Test

    Relay 85 Pilot Wire Monitor Test is addressed in ANSI/NETA ATS-2025.

  25. Relay 87 Differential Test

    Relay 87 Differential Test is addressed in ANSI/NETA ATS-2025.

  26. Relay Time-Delay Timing Test

    Relay Time-Delay Timing Test is addressed in ANSI/NETA ATS-2025.

  27. Relay Volts per Hertz Test

    Relay Volts per Hertz Test is addressed in ANSI/NETA ATS-2025.

  28. Zone selective interlocking

    Zone Selective Interlocking is specified for low-voltage ground-fault protection systems in acceptance testing at clause 7.14.B.8 of ANSI/NETA ATS-2025. Value: low-voltage ground-fault protection systems.

Ratio

  1. Polarity test

    Polarity Test is specified for low-voltage ground-fault protection systems in acceptance testing at clause 7.14.B.5 of ANSI/NETA ATS-2025. Value: low-voltage ground-fault protection systems.

Resistance

  1. Bolted connection resistance

    Bolted Connection Resistance is specified for low-voltage ground-fault protection systems in acceptance testing at clause 7.14.B.1 of ANSI/NETA ATS-2025. Value: low-voltage ground-fault protection systems.