The standard transitioned from the older 2013 edition to the current third edition to natively reflect the first established in IEC 60099-4:2014.
Some key topics covered in the standard include:
This standard focuses on gapped metal-oxide arresters for AC systems up to 52 kV. Like Part 4, the 2019 Edition introduces the modern system. Power-frequency voltage versus time tests and requirements for disconnectors were also added. iec 600995 pdf
[System Parameters Input] ➔ [Determine Continuous Operating Voltage (Uc)] ➔ [Calculate Rated Voltage (Ur)] ➔ [Evaluate Thermal Energy / Charge Handling] ➔ [Verify Insulation Coordination Margins] 1. Determine Continuous Operating Voltage ( Uccap U sub c The maximum continuous operating voltage ( Uccap U sub c
Websites offering "free PDF downloads" for copyrighted, in-print standards are almost always pirate sites. Using them is a legal risk for you or your organization. Some parts are also protected by DRM, requiring a plugin like FileOpen to view, and they often embed a digital watermark identifying the purchaser. The standard transitioned from the older 2013 edition
New annexes (H and I) provide methods to compare old and new classifications and estimate thermal energy requirements. Applications and Practical Use
Evaluates the third harmonic component of the leakage current, which serves as a highly accurate indicator of changes in the resistive properties of the MOV disk stack. Visual and Thermal Inspections Using them is a legal risk for you or your organization
Annex J provides guidance for older silicon carbide (SiC) gapped arresters still in service. Key Technical Components