Metal-oxide surge arresters without gaps (primarily covered in modern editions). Metal-oxide surge arresters with internal series gaps. Applications in alternating current (AC) power systems.
One of the most valuable sections of IEC 60099-5 is its breakdown of specific use cases:
Specialized units designed to protect overhead transmission and distribution lines from lightning flashovers, covered under IEC 60099-8. iec 600995 pdf
, which provides comprehensive, global recommendations for the selection and deployment of surge arresters in three-phase systems operating above 1 kV.
) and the nominal network frequency. The standard emphasizes configuring calculations based on the earthing system of the network (e.g., solidly earthed, ungrounded, or resonant earthed), as earthing alters line-to-ground voltage profiles during fault anomalies. 2. Determining Temporary Overvoltages (TOV) One of the most valuable sections of IEC
The standard is designed to provide comprehensive recommendations for engineers and system operators. It specifically addresses several types of arresters: Gapless Metal-Oxide Surge Arresters : Defined in IEC 60099-4
A few national libraries and university libraries in developed countries maintain “reading rooms” where you can view IEC standards on-screen for free, but you cannot download or print the PDF. Check with your local engineering library. To understand Part 5
This document is the user's manual for the series, providing non-mandatory, practical advice on selecting the right surge arrester. The 2018 edition (current as of 2018) is fully aligned with the technical revisions of Parts 4, 6, and 8.
IEC 60099-5 is far more than a simple handbook; it is a critical engineering framework that prevents millions of dollars in equipment damage annually. By thoroughly understanding its formulas, keeping safety margins intact, and sourcing legitimate, up-to-date PDF editions of the standard, engineering professionals can design power grids capable of riding out the toughest electrical storms.
To understand Part 5, it helps to see where it fits within the larger standard ecosystem: