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Ensuring the profile does not promote "shrouding," where dirt accumulates in tight, unwashed pockets. 4. Apply Correction Factors
Before choosing an insulator, the environment must be classified. The standard defines five Site Pollution Severity (SPS) classes based on the level of contamination:
Note: For polymeric, silicone, or composite insulators, engineers must refer to , as hydrophobic materials handle pollution through entirely different surface chemistry. Why Grid Planners Need the PDF iec 60815-2 pdf
for insulator dimensions, diameter, mounting position, and altitude to determine the mandatory Unified Specific Creepage Distance (USCD).
Additionally, many national standards bodies (DIN in Germany, AFNOR in France, JSA in Japan, etc.) resell IEC documents. If you are in a country that has adopted the standard as a national norm (e.g. China’s GB/T 26218.2‑2010), that version may be considerably cheaper and perfectly acceptable for local use. Ensuring the profile does not promote "shrouding," where
While Part 1 establishes the general principles and definitions for assessing pollution levels, .
Covers Definitions, Information, and General Principles . The standard defines five Site Pollution Severity (SPS)
): The horizontal distance the shed extends from the insulator core. The standard dictates that the ratio must be greater than or equal to for optimal self-cleaning via natural rainfall. Creepage-to-Clearance Ratio (
By following the guidelines and recommendations outlined in IEC 60815-2, users can ensure that surge arresters are selected and used effectively to protect HV power systems against overvoltages and surge events.