IEC TR 60099-10:2024

Overview

IEC TR 60099-10:2024 is a Technical Report from the IEC that explains the rationale behind the tests specified in IEC 60099-4:2014 for surge arresters. It is applicable to all test types and arrester designs covered by IEC 60099-4:2014. As a TR, it provides explanatory guidance rather than normative requirements and is intended to clarify why each test exists, how test outcomes should be interpreted, and typical pitfalls in application.

Key Topics

The report breaks down the purpose and background for each test in IEC 60099-4:2014 and consistently covers:

• Insulation withstand tests - rationale, sample selection, procedure and evaluation
• Residual voltage tests - purpose and interpretation
• Long-term stability under continuous operating voltage - objectives and test logic
• Repetitive charge-transfer (Qrs) rating - why and how it’s assessed
• Heat dissipation and operating duty tests - thermal behavior and load expectations
• Power-frequency voltage-versus-time tests
• Arrester disconnector and short-circuit tests - safety and interruption behavior
• Mechanical tests - bending moment for porcelain and polymer housings
• Environmental tests and seal leak rate - durability against climate and ingress
• Radio interference voltage (RIV) tests
• Supporting content such as sample selection rationale, test procedure rationale, evaluation rationale, historical notes and common misunderstandings for each test

Keywords integrated: surge arresters, arrester testing, residual voltage, insulation withstand, repetitive charge transfer, IEC TR 60099-10:2024, IEC 60099-4:2014.

Applications - who uses this TR and why

• Manufacturers - to justify test designs, interpret test results and explain product behavior to customers and certification bodies.
• Independent test laboratories - to apply IEC 60099-4 tests consistently and understand accepted evaluation practices.
• Utilities and system designers - to select arresters based on meaningful performance criteria (e.g., residual voltage, operating duty).
• Regulatory and certification bodies - to support conformity assessment where test rationale aids decision-making.
• Standards committees and researchers - historical context and rationale help inform future revisions and R&D.

Benefits include clearer test intent, better alignment between test procedures and expected performance, and reduced misinterpretation of test outcomes.

Related Standards (if applicable)

• IEC 60099-4:2014 - the normative standard that defines the tests (IEC TR 60099-10:2024 provides explanatory rationale).
• Other parts of the IEC 60099 series - for wider context on surge protective devices and system-level requirements.