IEC 60931-1:2025

Overview

IEC 60931-1:2025 is an international standard published by the International Electrotechnical Commission (IEC) that specifies requirements for shunt power capacitors of the non-self-healing type used in AC power systems. This standard covers capacitors and capacitor banks intended primarily for power-factor correction in alternating current systems with a rated voltage up to and including 1,000 V and operating frequencies ranging from 15 Hz to 60 Hz. Additionally, it addresses capacitors used in power filter circuits.

The 2025 edition (Edition 3.0) updates and consolidates general provisions for design, testing, and application of these capacitors, ensuring uniform safety, performance, and reliability criteria globally. The scope includes normal and unusual service conditions, environmental protection, and electrical characteristics to support robust system integration.

Key Topics

• Scope and Definitions: Clarifies the application domain for non-self-healing capacitors and establishes key terms essential for understanding the standard.
• Service Conditions: Specifies ambient temperature ranges, unusual environmental conditions, and installation considerations to optimize capacitor longevity and safety.
• Test Requirements and Procedures: Includes detailed testing protocols such as capacitance measurement, loss tangent (tan δ) measurement, voltage withstand tests, thermal stability, ageing, and discharge tests to ensure compliance with safety and performance benchmarks.
• Maximum Rated Values: Defines permissible voltage and current limits under different operating and transient conditions to prevent premature failure or safety hazards.
• Construction and Safety: Covers container connections, internal discharge devices, sealing, and protection against overvoltages and overload currents.
• Marking and Identification: Provides guidance on labelling, including rating plates, warning signs, and standardized connection symbols to facilitate correct usage and maintenance.
• Electromagnetic Compatibility (EMC): Addresses emission and immunity requirements to prevent interference in sensitive electronic environments.
• Special Service Provisions: Advises on installation in high-temperature environments, coordination with protective devices, and use in power filter circuits.

Applications

IEC 60931-1:2025 applies to a wide range of industrial and commercial electrical systems where power-factor correction is critical to enhance energy efficiency and reduce losses. Typical applications include:

• Low-voltage AC power distribution networks up to 1,000 V.
• Capacitor banks used to improve voltage stability and reduce reactive power demand.
• Power filters for harmonic mitigation and power quality improvement.
• Industrial motor and lighting systems requiring efficient reactive power management.
• Renewable energy systems integrating capacitors for grid support and harmonics control.

By following this standard, manufacturers, engineers, and system designers can ensure safe, reliable, and effective use of non-self-healing shunt capacitors, maximizing electrical system performance and longevity.

Related Standards

For comprehensive electrical system design and component safety, IEC 60931-1:2025 is often used alongside other related IEC standards such as:

• IEC 60831 – Power capacitors for AC systems designed for self-healing properties (complements this standard for different capacitor types).
• IEC 61000 series – Standards on electromagnetic compatibility, which support the EMC requirements outlined.
• IEC 60252 – Pertaining to capacitors for motor run applications.
• IEC 60364 – Electrical installations of buildings, providing safety guidelines where capacitors may be used.
• IEC 61439 – Low-voltage switchgear and control gear assemblies, often housing capacitor banks.

Adhering to IEC 60931-1:2025, together with these complementary standards, supports compliance with international safety, performance, and environmental regulations, promoting high-quality power capacitor solutions globally.

Keywords: IEC 60931-1, shunt power capacitors, non-self-healing capacitor, power-factor correction, AC power systems, rated voltage 1000 V, power filter capacitors, capacitor banks, electrical testing, thermal stability, electromagnetic compatibility, low voltage capacitors, capacitor safety standards.