IEC 62271-111:2019

Overview

IEC 62271-111:2019 is the international standard for high-voltage switchgear and controlgear, specifically addressing automatic circuit reclosers for alternating current (AC) systems up to and including 38 kV. Issued by the International Electrotechnical Commission (IEC), in collaboration with IEEE, this standard supersedes previous editions and provides harmonized requirements for multiple installation types, including overhead, pad-mounted, dry vault, and submersible applications. Dependently operated manual devices are not covered by this standard.

Automatic circuit reclosers (commonly referred to as reclosers) are essential for enhancing system reliability, as they automatically interrupt and restore power in the event of transient faults. IEC 62271-111:2019 details the performance, test methods, construction, and safety requirements for reclosers, facilitating their safe integration in medium-voltage distribution networks.

Key Topics

• Scope and Terminology

  • Applies to single or multi-pole reclosers with rated maximum voltages above 1,000 V up to 38 kV.
  • Covers reclosers intended for use in a variety of environments (outdoor, indoor, vault, submersible).

• Normative References

  • Replaces previous references with IEC 62271-1:2017 as the principal normative standard.

• Design and Construction

  • Specifies material requirements, earthing, protection against electric shock, enclosure protection levels (IP and IK ratings), and mechanical robustness.
  • Addresses gas and liquid system tightness, corrosion resistance, and EMC compliance.

• Types of Tests

  • Type Tests: Dielectric, mechanical, environmental, and performance tests (including wet tests, withstand voltage, and low current tests).
  • Routine Tests: Factory-based verifications such as dielectric, resistance, and operation checks.

• Ratings and Parameters

  • Establishes requirements for rated voltage, insulation levels, continuous and short-circuit currents, operating sequence, and environmental performance factors.
  • Includes special considerations for systems with effectively earthed neutrals.

• Maintenance & Safety

  • Details guidelines on transport, storage, installation, and regular maintenance practices.
  • Addresses failure reporting and safety measures for operators and equipment.

Applications

IEC 62271-111:2019 plays a critical role in the design, specification, procurement, and operation of:

• Medium-Voltage Distribution Networks
  • Protects against transient faults and improves system uptime through automatic recloser intervention.
• Urban, Rural, and Industrial Installations
  • Suitable for a wide range of deployment scenarios including distribution substations and overhead feeders.
• Renewable Energy Systems
  • Facilitates integration into grids with distributed energy resources where fault isolation and quick restoration are essential.
• Utilities and Industrial Power Systems
  • Ensures standardized, reliable performance for both public utilities and private industrial networks.

Implementing compliance with this standard improves the reliability, safety, and maintainability of electrical distribution assets.

Related Standards

• IEC 62271-1:2017 - Common specifications for high-voltage switchgear and controlgear
• IEC 60255-26 - EMC requirements for measuring relays and protection equipment
• IEEE Std C37.60 - North American counterpart (as aligned with IEC 62271-111)
• IEC 62271-100 - Requirements for high-voltage AC circuit breakers

For equipment previously classified as "fault interrupters," refer to the upcoming IEEE C37.62 standard, as these devices are no longer covered by IEC 62271-111:2019.

Adopting IEC 62271-111:2019 ensures that automatic circuit reclosers meet international performance and safety benchmarks, providing reliable protection and modernization for medium-voltage AC power systems worldwide. For further updates or purchasing information, visit the IEC Webstore.