IEC TS 60815-1:2008 High-Voltage Insulator Selection for Polluted
A clean, dry insulator is an excellent insulator. However, in the real world, insulators accumulate dust, salt, industrial pollutants, and bird excrement. When combined with moisture (fog, dew, or light rain), this pollution layer becomes conductive, allowing leakage current to flow. Pollution flashover remains one of the most significant
Pollution flashover remains one of the most significant threats to the reliability of outdoor high-voltage (HV) AC and DC transmission systems. Unlike transient overvoltages or lightning strikes, pollution-related outages often lead to prolonged downtime and complex maintenance. IEC TS 60815 (Series) provides a systematic, risk-based methodology for the proper selection and dimensioning of insulators under various pollution conditions. This article explores the evolution, structure, and practical application of the IEC 60815 guide, focusing on how engineers determine the required Unified Specific Creepage Distance (USCD) to ensure long-term operational security. This article explores the evolution