Overview - IEC 60099-6:2002 (Surge arresters, rated 52 kV and less)
IEC 60099-6:2002 is the International Electrotechnical Commission standard that specifies requirements and test procedures for metal‑oxide surge arresters containing both series and parallel gapped structures, with rated voltages of 52 kV and below. It applies to arresters housed in porcelain or polymeric enclosures and defines minimum design, type-test, routine-test and accelerated ageing criteria for internal series‑gapped metal‑oxide arresters used on AC power systems.
Key points:
- Covers metal‑oxide resistor type surge arresters with integrated gapped structures.
- Focused on arresters with internal series gaps and rated ≤ 52 kV.
- Incorporates an accelerated ageing procedure to simulate long‑term voltage and temperature effects.
- Excludes certain types (e.g., externally gapped, shunt‑gapped, series gapped above ~54 kV and some line‑discharge classes).
Key topics and technical requirements
The standard organizes requirements and tests to ensure arrester safety, performance and durability. Major technical topics include:
- Insulation withstand of housing (porcelain or polymeric)
- Reference voltage measurement and tolerances
- Impulse protective level (residual voltage) - tests with switching and lightning impulses
- Partial discharge measurement techniques and limits
- Seal leakage and moisture ingress tests
- Thermal stability and verification of power losses at elevated temperatures
- Long‑duration current impulse and operating duty tests (to verify behavior under fault/current stress)
- Power‑frequency sparkover and voltage‑vs‑time characteristics
- Short‑circuit withstand and pressure relief provisions
- Disconnectors, internal/external grading components and grading current requirements
- Weather ageing and artificial pollution testing
- Defined type tests, routine tests and acceptance tests for manufacturers and test laboratories
Applications and who uses this standard
IEC 60099-6 is intended for:
- Surge arrester manufacturers - to design and certify series‑gapped metal‑oxide arresters
- Test laboratories - to perform type and routine testing per IEC procedures
- Utility and transmission engineers - for specifying arresters for overhead lines and substations
- Procurement and quality teams - to evaluate supplier conformity and acceptance testing
- Standards and safety assessors - to ensure long‑term performance under pollution, thermal and electrical stress
Typical applications include protection of overhead distribution and transmission equipment where gapped metal‑oxide arresters are chosen to control overvoltages and provide energy‑dispersing performance on AC systems.
Related standards
Commonly referenced IEC standards that complement IEC 60099-6:
- IEC 60099‑1 (non‑linear resistor type gapped arresters)
- IEC 60099‑3 (artificial pollution testing)
- IEC 60099‑4 (metal‑oxide arresters without gaps)
- IEC 60060‑1 / IEC 60060‑2 (high‑voltage test techniques)
- IEC 60270 (partial discharge measurements)
Keywords: IEC 60099-6, surge arresters, metal-oxide, series gapped, parallel gapped, 52 kV, impulse protective level, operating duty, thermal stability, weather ageing, insulation withstand.
Open preview (PDF)Surge arresters - Part 6: Surge arresters containing both series and parallel gapped structures - Rated 52 kV and less
