IEC 62271-107:2012

Overview

IEC 62271-107:2012 is an international standard published by the International Electrotechnical Commission (IEC) focusing on high-voltage switchgear and controlgear. Specifically, it covers alternating current fused circuit-switchers designed for rated voltages above 1 kV up to and including 52 kV. This standard applies to three-pole operated fused circuit-switcher units used in electrical distribution systems. These units combine a circuit-switcher and current-limiting fuses, capable of breaking any load or fault current up to the rated short-circuit breaking current at the rated recovery voltage, as well as making circuits corresponding to the rated short-circuit making current at rated voltage.

The 2012 edition is a significant technical revision of the first edition (2005). Major updates include the incorporation of clauses from IEC 62271-1, updated normative references, reorganized numbering, and improved clarity on type testing and acceptance criteria. IEC 62271-107 is intended to be read alongside IEC 62271-1:2007, which provides common requirements for high-voltage switchgear.

Key Topics

• Scope and Application: Applies to alternating current fused circuit-switchers for voltages from 1 kV to 52 kV, primarily used in three-pole configurations within distribution networks.
• Design and Construction: Includes requirements for insulation, earthing, auxiliary equipment, operation mechanisms, interlocking devices, creepage distances, gas and liquid tightness, fire hazard resistance, electromagnetic compatibility (EMC), and corrosion protection.
• Rated Values: Defines critical electrical ratings such as rated voltage, rated insulation level, rated current (normal, thermal, short-circuit withstand), rated frequency, and short-circuit making and breaking currents.
• Type Tests and Routine Tests: Specifies comprehensive testing procedures for dielectric strength, radio interference voltage, temperature rise, mechanical operation, making and breaking capacity, tightness, EMC, and X-ray emission from vacuum interrupters.
• Selection Guidelines: Offers practical advice on how to select fused circuit-switchers based on rated values, service conditions, overload capacities, current ratings, and operation performance.
• Safety and Environmental Impact: Covers requirements for safe installation, operation, maintenance, and environmental considerations to minimize hazards.
• Documentation: Details necessary information for enquiries, tenders, orders, and product labeling.

Applications

IEC 62271-107:2012 fused circuit-switchers are widely applied in:

• Medium-to-high voltage electrical distribution networks for protecting and controlling electrical circuits.
• Industrial power systems requiring reliable interruption and fault isolation at rated voltages above 1 kV.
• Renewable energy installations where coordination of protective devices and fault current interruption are critical.
• Utility substations and switching stations ensuring safe and effective load and fault current handling.
• Power system automation involving coordinated switching and fuse integration for dependable operation.
• Situations where a compact, cost-effective circuit-switcher combined with current-limiting fuses offers a practical alternative to switch-fuse combinations and circuit-breakers for interrupting fault currents.

The standard ensures that fused circuit-switchers meet stringent performance requirements regarding breaking capacity, dielectric properties, insulation integrity, mechanical endurance, and electrical compatibility, essential for maintaining reliable and safe power distribution systems.

Related Standards

IEC 62271-107:2012 is part of a broader IEC 62271 series covering high-voltage switchgear and controlgear. Key related standards include:

• IEC 62271-1: General requirements for high-voltage switchgear and controlgear - provides foundational guidelines and terminology referenced throughout IEC 62271-107.
• IEC 62271-103: Specifies load-break and switch-fuse combinations for rated voltages above 1 kV up to and including 52 kV; referenced for alignment of acceptance criteria.
• IEC 62271-201: Covers electromagnetic compatibility (EMC) requirements for high-voltage switchgear.
• IEC/TR 60787: Technical reports on switching phenomena and test procedures.
• IEC 60694: Common specifications for high-voltage switchgear and controlgear (superseded by IEC 62271-1 reference updates).

Adherence to IEC 62271-107 alongside these complementary standards ensures interoperability, safety, and optimal performance of fused circuit-switchers within modern electrical power systems.

Keywords: IEC 62271-107, high-voltage fused circuit-switcher, AC switchgear, rated voltage 1 kV to 52 kV, current-limiting fuse, high-voltage controlgear, electrical distribution standard, short-circuit breaking current, switchgear type tests, IEC high-voltage standards