HD 525.2 S1:1989

Overview

HD 525.2 S1:1989 - Shunt capacitors for a.c. power systems having a rated voltage above 1 kV - Part 2: Endurance testing is a CLC report that defines endurance testing requirements for shunt capacitors manufactured and assessed in accordance with IEC Publication 871-1. The standard focuses on verifying long-term performance and reliability of capacitors used in high-voltage a.c. power systems by specifying the tests, monitoring and documentation required for endurance qualification.

Key topics and requirements

The document concentrates on the practical elements of endurance testing for shunt capacitors, including:

• Scope and applicability: applies to shunt capacitors per IEC 871-1 with rated voltages in the high-voltage range indicated by the standard.
• Purpose of endurance tests: to demonstrate long-term electrical and thermal stability, dielectric integrity and safe operation under expected service stress.
• Test planning and sample selection: guidance on representative samples for type and routine endurance testing and on the number of specimens required.
• Test conditions and monitoring: requirements for applying voltage, current/load conditions, temperature monitoring, and continuous observation during tests.
• Performance criteria and pass/fail evaluation: measurable endpoints for dielectric behaviour, insulation condition, temperature rise and absence of catastrophic failure.
• Reporting and documentation: required test report elements, including test sequence, measured parameters, deviations and conclusions.

Note: This summary stays at a high level. The standard itself contains the specific test procedures, durations and acceptance limits that must be followed for compliance.

Applications and who uses it

This endurance testing standard is practical and relevant for:

• Capacitor manufacturers - for type testing during product development and quality assurance.
• Independent test laboratories - to perform accredited endurance and reliability tests.
• Power utilities and grid operators - when specifying procurement requirements and verifying vendor claims for shunt capacitors in substations and power-factor correction equipment.
• Certification bodies and compliance engineers - to assess conformity with IEC-based requirements.
• Design and maintenance engineers - to plan lifecycle, replacement intervals and preventive maintenance based on validated endurance data.

Related standards

• IEC Publication 871-1 - referenced as the foundational specification for the capacitors covered by this endurance testing report.
• National adoptions and implementations (e.g., CLC or SIST versions) may exist; consult the applying national body for exact local editions and amendments.

Keywords: shunt capacitors, endurance testing, a.c. power systems, rated voltage above 1 kV, IEC 871-1, capacitor testing standard, type testing, reliability testing.