Overview
IEC 62067:2022 defines test methods and requirements for power cables with extruded insulation and their accessories for fixed installations at rated voltages above 150 kV (Um = 170 kV) up to and including 500 kV (Um = 550 kV). The standard covers single-core cables and associated accessories under usual installation and operational conditions. It excludes special cable types (for example, submarine cables) where modified or special test conditions may be necessary, and it does not cover transition joints between extruded-insulation and paper-insulated cables.
Key topics and technical requirements
- Scope and definitions: voltage designations, insulating materials, metal screens/sheaths and oversheathing materials.
- Test categories: routine tests, sample tests, type tests, prequalification tests and on-site electrical tests for complete cable systems and accessories.
- Electrical tests: partial discharge testing, power-frequency and impulse voltage tests, heating-cycle voltage tests, tan δ measurements and impulse (lightning/switching) tests.
- Mechanical and material tests: ageing, mechanical properties before/after ageing, hot-set tests for XLPE/EPR, density measurements (HDPE), pressure and low-temperature tests for oversheaths, ozone resistance and fire-performance tests.
- Special tests and measurements: resistivity of semi-conducting screens, water-penetration tests, measurement of insulation/oversheath thickness, conductor temperature determination methods for heating-cycle tests.
- Accessories: test requirements and characteristics for terminations (including gas-immersed), outdoor insulators and prefabricated accessories; tests on components and complete assemblies.
- Quality and compatibility checks: material compatibility testing, repeatability/frequency of sample tests and examination procedures.
Practical applications and users
IEC 62067 is essential for:
- Cable manufacturers and accessory suppliers - for product development, type approval and factory quality control.
- Utilities and transmission system operators - for procurement specifications, acceptance testing and prequalification of cable systems.
- Testing laboratories and certification bodies - to perform standardized electrical, mechanical and environmental tests.
- Design and installation engineers - to ensure selected cable systems meet operational and safety requirements for high-voltage transmission projects.
Typical applications include validation of high-voltage transmission cables, acceptance testing after manufacture or installation, material compatibility checks in system design, and prequalification of new cable systems for grid projects.
Related standards
For comprehensive specification and application, consult the IEC publications catalogue for related standards covering cable installation practices, lower-voltage extruded cables, paper‑insulated systems and complementary test methods. The IEC webstore provides the latest editions and amendments.