IEC TR 60099-10-2024 PDF

Full title and description

Surge arresters — Part 10: Rationale for tests specified by IEC 60099-4:2014. This Technical Report explains the background, objectives and interpretation of the tests specified in IEC 60099-4:2014 for metal-oxide surge arresters (gapless) and other arrester types covered by that standard. It is explanatory in nature and does not introduce normative requirements or replace clauses of IEC 60099-4:2014.

Abstract

IEC TR 60099-10:2024 provides a structured rationale for each type test and relevant sub‑test in IEC 60099-4:2014. For every test it outlines the purpose, historical background, selection of samples, test‑procedure logic, expected observations and criteria for interpretation. The report is intended to help manufacturers, test houses, utilities and regulatory bodies understand why particular tests exist, how to apply them consistently and how to interpret test results and atypical outcomes.

General information

• Status: Published (Technical Report)
• Publication date: 19 June 2024
• Publisher: International Electrotechnical Commission (IEC)
• ICS / categories: 29.120.50; 29.240.10
• Edition / version: Edition 1.0 (2024)
• Number of pages: 61

Scope

The Technical Report is applicable to all tests and arrester types dealt with in IEC 60099-4:2014. It explains the rationale behind each specified test (for example insulation withstand, residual voltage, long‑duration current impulses, repetitive charge transfer, thermal/operating duty, short‑circuit and disconnector tests), gives guidance on sample selection and test application, and clarifies interpretation of results. The document is explanatory only — it contains no new normative requirements and does not replace or modify IEC 60099-4:2014.

Key topics and requirements

• Purpose and historical background for each test specified in IEC 60099-4:2014.
• Insulation withstand tests: lightning-impulse and power‑frequency rationale, sample selection and evaluation.
• Residual voltage tests: steep‑current, lightning and switching impulse rationale and interpretation.
• Long‑term stability under continuous operating voltage: objectives, monitoring parameters and pass/fail considerations.
• Repetitive charge‑transfer (Qrs) and energy capability: rationale for rating and test methodology.
• Heat dissipation and operating duty tests: thermal behaviour, monitoring and thermal‑runaway criteria.
• Power‑frequency voltage vs. time characteristics and endurance tests.
• Arrester disconnector/fault‑indicator tests and short‑circuit/pressure‑relief rationale for safety and end‑of‑life behaviour.
• Mechanical, environmental and sealing tests (including seal leak‑rate rationale and partial discharge considerations).
• Radio interference voltage (RIV) and other electromagnetic considerations where relevant.
• Guidance on sample selection, test sequencing, common misunderstandings and interpretation of atypical results.

Typical use and users

This Technical Report is intended for: arrester designers and manufacturers (for design validation and test justification); third‑party test laboratories (for consistent application and interpretation of IEC 60099-4 tests); utility and substation engineers (for procurement, specification and acceptance testing); certification and regulatory bodies (for understanding test intent); and academics or consultants involved in insulation coordination and surge protection research.

Related standards

Main related publications include IEC 60099-4:2014 (the normative test standard this TR explains), other parts of the IEC 60099 series (general and application parts), relevant high‑voltage test technique standards (for example IEC standards on impulse and power‑frequency test methods), and standards on partial discharge and switchgear where cross‑references to test interpretation are needed.

Keywords

surge arresters, metal‑oxide arresters, gapless arresters, tests, test rationale, residual voltage, insulation withstand, repetitive charge transfer, thermal stability, operating duty, short‑circuit, disconnector, IEC 60099-4:2014, IEC TR 60099-10:2024

FAQ

Q: What is this standard?

A: IEC TR 60099-10:2024 is a Technical Report that explains the rationale and background of the tests specified in IEC 60099-4:2014 for surge arresters. It is explanatory guidance rather than a requirements standard.

Q: What does it cover?

A: It covers the purpose and justification for each test in IEC 60099-4:2014, including sample selection, test‑procedure logic, expected observations, common pitfalls and interpretation guidance for test results across the range of arrester designs addressed by IEC 60099-4.

Q: Who typically uses it?

A: Arrester manufacturers, test laboratories, utility engineers, procurement/specification teams, certification bodies, consultants and researchers who need to understand why specific tests exist and how to interpret their outcomes.

Q: Is it current or superseded?

A: It was published in June 2024 as Edition 1.0 and is current as a Technical Report. It does not supersede IEC 60099-4:2014; rather it complements that standard by providing explanatory material. Users should consult the normative IEC 60099-4:2014 for mandatory test requirements.

Q: Is it part of a series?

A: Yes. It is Part 10 in the IEC 60099 series on surge arresters; other parts of the series cover product requirements, application guidance and specialised arrester types.

Q: What are the key keywords?

A: Surge arresters, residual voltage, insulation withstand, repetitive charge transfer, thermal stability, operating duty, arrester testing, IEC 60099-4, test rationale.