SIST HD 525.2 S1:2003/A1:2003

Overview

HD 525.2 S1:1989/A1:1991 (published by CLC) is a harmonized document addressing endurance testing of shunt capacitors for a.c. power systems. The standard focuses on methods to verify long-term performance and reliability of shunt capacitors used in high-voltage distribution and transmission networks. A regional adoption (SIST HD 525.2 S1:2003/A1:2003) references the same Part 2 content and notes application to rated voltages in national editions (extract shows a version for systems above 600 V, while the primary reference specifies above 1 kV).

Key Topics

This Part 2 document concentrates on practical aspects of endurance evaluation for high-voltage shunt capacitors. Key topics typically covered include:

• Endurance test objectives - demonstrating capacitor life under specified electrical and thermal stress.
• Test sequences and conditions - defined procedures for applying continuous or cyclic voltage and environmental stresses to simulate ageing.
• Measurement parameters - monitoring changes in capacitance, dissipation factor (losses), leakage current and insulation condition during and after testing.
• Acceptance criteria - pass/fail limits and criteria to determine whether units meet required endurance performance.
• Sample preparation and selection - guidance on representative samples for type and routine testing.
• Reporting and documentation - required test records, results presentation and certification requirements.

(Exact procedural details such as voltages, durations and temperature profiles are specified in the full standard document and may vary between editions.)

Applications

This standard is used to ensure the long-term operational reliability and safety of shunt capacitors in a.c. power systems. Typical practical applications:

• Manufacturer type testing to validate capacitor designs and materials for market release.
• Quality assurance during production runs and after design changes.
• Independent test laboratories performing endurance and type approval testing for clients.
• Utility procurement and specification to define technical acceptance criteria for installed capacitor banks.
• Asset managers and maintenance teams for lifecycle planning and failure-risk assessment.

Who Should Use It

• Capacitor manufacturers and design engineers
• Electrical test laboratories and certification bodies
• Power utilities, grid operators and consultants
• Specifiers, procurement officers and regulators

Related Standards

• Other parts of HD 525 series (capacitor design, safety and routine testing)
• Regional adoptions (e.g., SIST HD 525.2 S1 editions) and IEC equivalents for high-voltage capacitor testing

Keywords: shunt capacitors, endurance testing, AC power systems, high-voltage capacitors, HD 525.2, CLC standard, capacitor life testing, capacitor type testing.