Protective Relay Reference

Relay 25 Sync Check Test

Updated 2026-10-24

Data records

  • Relay 25 Sync Check Test is specified for electromechanical and solid-state protective relays in acceptance testing at clause 7.9.1.B.3.4 of ANSI/NETA ATS-2025. Value: electromechanical and solid-state protective relays. Source: ANSI/NETA ATS-2025, clause 7.9.1.B.3.4. Verified 2026-10-13. Record tests.relay-25-sync-check-test.equipment.relay.acceptance
  • Relay 25 Sync Check Test is specified for electromechanical and solid-state protective relays in maintenance testing at clause 7.9.1.B.3.4 of ANSI/NETA MTS-2023. Value: electromechanical and solid-state protective relays. Source: ANSI/NETA MTS-2023, clause 7.9.1.B.3.4. Verified 2026-10-13. Record tests.relay-25-sync-check-test.equipment.relay.maintenance
  • Relay 25 Sync Check Test is addressed in ANSI/NETA ATS-2025. Source: ANSI/NETA ATS-2025, clause 7.9.1.B.3.4. Verified 2026-10-13. Record tests.relay-25-sync-check-test.governed-by.ansi-neta-ats
  • Relay 25 Sync Check Test is addressed in ANSI/NETA MTS-2023. Source: ANSI/NETA MTS-2023, clause 7.9.1.B.3.4. Verified 2026-10-13. Record tests.relay-25-sync-check-test.governed-by.ansi-neta-mts
  • For distributed energy resources that produce a fundamental voltage before connecting, such as synchronous generators, grid-forming inverters and self-excited induction generators, clause 4.10.4 and Table 5 of IEEE 1547-2018 set maximum frequency, voltage and phase angle differences at the moment of paralleling, tiered by aggregate DER rating, and limit the voltage step the paralleling may cause at the point of common coupling; the area electric power system operator may waive the differences where paralleling meets the rapid voltage change limit of clause 7.2. Source: IEEE 1547-2018, clause 4.10.4, Table 5. Verified 2026-10-24. Record tests.relay-25-sync-check-test.ieee1547.synchronization
  • The test method is named Relay 25 Sync Check Test. Value: Relay 25 Sync Check Test. Source: Electrical Testing Reference editorial taxonomy, 2026-10 edition. Verified 2026-10-13. Record tests.relay-25-sync-check-test.title

Sources

  • ANSI/NETA ATS-2025, Acceptance Testing Specifications for Electrical Power Equipment and Systems, 2025 edition, NETA. Cited: clause 7.9.1.B.3.4. Held as: Purchased single-user copy. Publisher page
  • ANSI/NETA MTS-2023, Maintenance Testing Specifications for Electrical Power Equipment and Systems, 2023 edition, NETA. Cited: clause 7.9.1.B.3.4. Held as: Purchased single-user copy. Publisher page
  • Electrical Testing Reference editorial taxonomy, Electrical Testing Reference editorial taxonomy of test methods, 2026-10 edition, Electrical Testing Reference. Held as: Own observation.
  • IEEE 1547-2018, Interconnection and Interoperability of Distributed Energy Resources with Associated Electric Power Systems Interfaces, 2018 edition, IEEE. Cited: clause 4.10.4, Table 5. Held as: Purchased single-user copy.

Obtaining the documents

Changelog (7 entries)
DateRevisionChange
2026-10-24created (tests.relay-25-sync-check-test.ieee1547.synchronization)
2026-10-24review_status unreviewed -> software_reviewed (tests.relay-25-sync-check-test.ieee1547.synchronization)
2026-10-13created (tests.relay-25-sync-check-test.equipment.relay.acceptance)
2026-10-13created (tests.relay-25-sync-check-test.equipment.relay.maintenance)
2026-10-13created (tests.relay-25-sync-check-test.governed-by.ansi-neta-ats)
2026-10-13created (tests.relay-25-sync-check-test.governed-by.ansi-neta-mts)
2026-10-13created (tests.relay-25-sync-check-test.title)

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"Relay 25 Sync Check Test." Protective Relay Reference. 2026-10-24. https://www.protectiverelayreference.com/tests/relay-25-sync-check-test/.