IEC 60931-2:2025

Overview

IEC 60931-2:2025 is an international standard published by the International Electrotechnical Commission (IEC) that specifies the ageing and destruction test requirements for shunt power capacitors of the non-self-healing type designed for AC systems with a rated voltage up to and including 1,000 V. This third edition of the standard cancels and updates the previous 1995 edition, focusing on durability and safety verification to ensure the long-term operational reliability of these capacitors in electrical systems. The tests defined support quality assurance and compliance with safety regulations.

Key Topics

• Scope and Applicability
  IEC 60931-2 applies to capacitors that meet the general requirements outlined in IEC 60931-1:2025. This part specifically addresses test methods for ageing and destruction performance to evaluate capacitor lifespan and failure modes.

• Ageing Test Procedures
  The ageing test involves conditioning capacitors under controlled temperature and voltage for extended periods:

  • Capacitors are energized at 1.25 times the rated voltage for 750 hours under temperature conditions simulating actual operating environments.
  • Followed by 1,000 discharge cycles using DC voltage of twice the rated voltage and discharging through specified inductance, simulating operational stress.
  • A repeat energization for another 750 hours concludes the test sequence.
    These tests ensure no permanent electrical breakdown or degradation beyond allowable capacitance variation margins occurs.

• Destruction Test
  For capacitors without internal fuses, destruction testing simulates end-of-life failure to evaluate safe failure modes. This test is generally performed after ageing tests and involves stressing a single unit or phase to failure under controlled conditions to examine the response and verify containment and safety.

• Testing Environments and Conditions
  Two methods ensure temperature stability during tests: air circulation with temperature control or immersion in a heated liquid bath with temperature maintained within ±2 °C. Capacitor orientation and mounting details ensure uniform test conditions.

Applications

IEC 60931-2:2025 serves multiple practical roles across industries:

• Product Development and Quality Control
  Manufacturers use this standard to validate the endurance and safety of non-self-healing shunt capacitors before market release, ensuring product reliability over years of electrical operation.
• Certification and Compliance
  Testing in accordance with IEC 60931-2 is essential for obtaining certification from regulatory bodies, facilitating global market acceptance of power capacitors.
• Electrical System Design and Safety
  System designers apply these test results to select capacitors verified for robustness, reducing failures and downtime in power factor correction and reactive power compensation systems up to 1,000 V AC.
• Maintenance and Retirement Decisions
  Utilities and industrial users refer to test criteria to assess capacitor ageing and predict end-of-life behavior, optimizing maintenance schedules and safe decommissioning practices.

Related Standards

• IEC 60931-1:2025 – General requirements and test methods for shunt power capacitors of the non-self-healing type, serving as the foundational part to which IEC 60931-2 is a complement.
• IEC 61071 – General requirements for capacitors used in power electronic equipment, important for applications involving nonlinear loads.
• IEC 60252 Series – Capacitors for motor run applications, providing additional scope for capacitors in industrial motor circuits.
• IEC 60384 Series – Fixed capacitors for use in electronic equipment, relevant for smaller capacitors used in control and signal processing.

Keywords: IEC 60931-2:2025, non-self-healing shunt power capacitors, ageing test, destruction test, capacitor testing standard, AC system capacitors, rated voltage 1000 V, capacitor durability, power capacitor safety, IEC standards, capacitor quality control.