The standard includes updated recommendations for Externally Gapped Line Arresters (EGLA), as defined in IEC 60099-8 , which are increasingly popular for protecting overhead transmission lines.

Enhanced guidance for protecting cable sheaths, rotating machines, capacitor switching, and UHV (Ultra High Voltage) systems. Critical Selection Parameters

Clearer definitions and parameters for high-current and long-duration discharge capabilities, especially crucial for modern, heavily loaded networks.

The IEC 60099-5:2018 (Edition 3.0) standard serves as the primary, updated guide for selecting and applying surge arresters in three-phase systems with nominal voltages above 1 kV. It covers gapless metal-oxide, gapped, and line surge arresters (EGLA), incorporating performance-based ratings such as Qrscap Q sub r s end-sub Qthcap Q sub t h end-sub

for metal-oxide surge arresters. Unlike previous versions, it emphasizes: Residual Voltage Optimization

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