EN IEC 62772:2023
(Main)Composite hollow core station post insulators with a.c. voltage greater than 1 000 V and d.c. voltage greater than 1 500 V - Definitions, test methods and acceptance criteria
General Information
- Abstract
This International Standard applies to composite hollow core station post insulators consisting of a load-bearing insulating tube (core) made of resin impregnated fibres, insulating filler material (solid, liquid, gaseous - pressurized or unpressurized), a housing (outside the insulating tube) made of polymeric material (for example silicone or ethylene-propylene) and fixing devices at the ends of the insulating tube. Composite hollow core station post insulators as defined in this standard are intended for general use in substations in both, outdoor and indoor environments, operating with a rated AC voltage greater than 1 000 V a.c. and a frequency not greater than 100 Hz or for use in direct current systems with a rated voltage greater than 1 500 V.d.c. The object of this standard is: to define the terms used; to prescribe test methods; to prescribe acceptance criteria. All the tests in this standard, apart from the thermal-mechanical test, are performed at normal ambient temperature. This standard does not prescribe tests that are characteristic of the apparatus of which the composite hollow core station post insulator ultimately may form a part (e.g. disconnector switch, reactor support, HVDC valves).
- Status
- Published
- Publication Date
- 21-Dec-2023
- Technical Committee
- CLC/SR 36 - Insulators for substations
- Drafting Committee
- IEC/TC 36 - IEC_TC_36
- Current Stage
- 9093 - Decision to confirm - Review Enquiry
- Start Date
- 22-Dec-2025
- Completion Date
- 25-Aug-2026
Overview
EN IEC 62772:2023 (IEC 62772:2023) specifies definitions, test methods and acceptance criteria for composite hollow core station post insulators intended for substations operating at AC voltages > 1 000 V (frequency ≤ 100 Hz) or DC voltages > 1 500 V. Published by CLC/CENELEC, this standard covers insulators built from a resin‑impregnated fibre load‑bearing tube (core), an insulating filler (solid, liquid or gaseous) and a polymeric housing (e.g., silicone or ethylene‑propylene) with end fixing devices. All tests except the thermal‑mechanical test are carried out at normal ambient temperature.
Key topics
- Scope & definitions: Clear terminology for hollow core composite station post insulators and their components (core, filler, housing, end fittings).
- Classification of tests: Design tests, type tests, sample tests and routine tests with prescribed test categories and when they apply.
- Mechanical verification: Tests for maximum design cantilever load (MDCL), maximum design torsion load (MDToL), specified tension load (STL), bending, compression and buckling verification.
- Interface and end‑fitting tests: Verification of connections, disruptive‑discharge dry power‑frequency voltage test and pre‑stress procedures (thermal‑mechanical and water immersion).
- Material and ageing tests: Hardness, accelerated weathering, tracking & erosion (including 1 000 h salt fog AC voltage test), flammability and hydrophobicity transfer tests for housing/shed materials.
- Core integrity tests: Dye‑penetration (porosity) and water diffusion tests for the resin‑impregnated fibre tube and for cores with housing/filler.
- Electrical tests: Dry/wet power‑frequency withstand, lightning and switching impulse tests and mounting arrangements for electrical testing.
- Routine quality checks: Seal leak rate (routine) test and documentation requirements.
- Acceptance criteria: Pass/fail conditions are prescribed for each test (standard does not set apparatus‑specific tests for equipment the insulator may be part of).
Applications
- Manufacturers: Design validation, type approval and production quality control of composite hollow core station post insulators.
- Utilities & grid operators: Specification and procurement for indoor and outdoor substation supports used in AC and DC systems.
- Test laboratories & certification bodies: Performing standardized mechanical, electrical and environmental tests for compliance and certification.
- Design engineers: Verifying mechanical load ratings and long‑term performance (weathering, hydrophobicity, leakage).
Related standards
Key references given in the standard include:
- IEC 60168, IEC 61109, IEC 61462, IEC 62217, IEC 62231 and IEC/TR 62039, plus related test and measurement standards (e.g., IEC 60060‑1). These provide complementary requirements for insulators, materials selection, and electrical testing.
Keywords: composite hollow core station post insulators, EN IEC 62772:2023, IEC 62772, test methods, acceptance criteria, substations, polymeric housing, resin‑impregnated fibres, AC >1000 V, DC >1500 V.
Relations
- Effective Date
- 12-Jan-2021
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
- Effective Date
- 03-Feb-2026
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Frequently Asked Questions
EN IEC 62772:2023 is a standard published by CLC. Its full title is "Composite hollow core station post insulators with a.c. voltage greater than 1 000 V and d.c. voltage greater than 1 500 V - Definitions, test methods and acceptance criteria". This standard covers: This International Standard applies to composite hollow core station post insulators consisting of a load-bearing insulating tube (core) made of resin impregnated fibres, insulating filler material (solid, liquid, gaseous - pressurized or unpressurized), a housing (outside the insulating tube) made of polymeric material (for example silicone or ethylene-propylene) and fixing devices at the ends of the insulating tube. Composite hollow core station post insulators as defined in this standard are intended for general use in substations in both, outdoor and indoor environments, operating with a rated AC voltage greater than 1 000 V a.c. and a frequency not greater than 100 Hz or for use in direct current systems with a rated voltage greater than 1 500 V.d.c. The object of this standard is: to define the terms used; to prescribe test methods; to prescribe acceptance criteria. All the tests in this standard, apart from the thermal-mechanical test, are performed at normal ambient temperature. This standard does not prescribe tests that are characteristic of the apparatus of which the composite hollow core station post insulator ultimately may form a part (e.g. disconnector switch, reactor support, HVDC valves).
This International Standard applies to composite hollow core station post insulators consisting of a load-bearing insulating tube (core) made of resin impregnated fibres, insulating filler material (solid, liquid, gaseous - pressurized or unpressurized), a housing (outside the insulating tube) made of polymeric material (for example silicone or ethylene-propylene) and fixing devices at the ends of the insulating tube. Composite hollow core station post insulators as defined in this standard are intended for general use in substations in both, outdoor and indoor environments, operating with a rated AC voltage greater than 1 000 V a.c. and a frequency not greater than 100 Hz or for use in direct current systems with a rated voltage greater than 1 500 V.d.c. The object of this standard is: to define the terms used; to prescribe test methods; to prescribe acceptance criteria. All the tests in this standard, apart from the thermal-mechanical test, are performed at normal ambient temperature. This standard does not prescribe tests that are characteristic of the apparatus of which the composite hollow core station post insulator ultimately may form a part (e.g. disconnector switch, reactor support, HVDC valves).
EN IEC 62772:2023 is classified under the following ICS (International Classification for Standards) categories: 29.080.10 - Insulators. The ICS classification helps identify the subject area and facilitates finding related standards.
EN IEC 62772:2023 has the following relationships with other standards: It is inter standard links to EN 62772:2016, EN IEC 61462:2023, EN IEC 61109:2025, EN IEC 62217:2025, EN 62231:2006, EN IEC 61869-1:2024. Understanding these relationships helps ensure you are using the most current and applicable version of the standard.
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