Iec 60815-2 Pdf May 2026

Do not rely on outdated rules of thumb or unauthorized copies. Purchase the official from the IEC Webstore or your national body. Then, integrate its tables and formulas into your design workflow. Whether you are protecting a 33 kV distribution line or a 765 kV backbone, this standard is your ultimate guide to preventing the next costly flashover. Frequently Asked Questions (FAQ) Q: Can I use IEC 60815-2 for DC lines? A: No. Use IEC 60815-4 for DC. DC pollution performance is worse than AC due to unidirectional leakage current.

System voltage (Um) = 145 kV (max operating voltage for a 132 kV system). Required creepage = 38 mm/kV × 145 kV = 5,510 mm . iec 60815-2 pdf

From Table 2 (Level d → 31–43 mm/kV). Choose 38 mm/kV as a conservative interim value. Do not rely on outdated rules of thumb

| Pollution Class | Specific Creepage Distance (mm/kV) | | --- | --- | | a – Light | 16 – 20 | | b – Medium | 20 – 25 | | c – Heavy | 25 – 31 | | d – Very Heavy | 31 – 43 | | e – Extreme | > 43 | Whether you are protecting a 33 kV distribution

Introduction: Why Insulator Pollution Matters For decades, unplanned outages in power transmission and distribution networks have been traced back to a single, often underestimated culprit: pollution-induced flashover . Coastal salt deposits, industrial emissions, desert dust, and agricultural residue accumulate on the surface of high-voltage insulators. When combined with fog, dew, or light rain, these contaminants become conductive, leading to a dangerous leakage current, dry-band arcing, and ultimately, a complete power system fault.

The combination of cement dust (conductive when wet – high NSDD) and salt spray (high ESDD) pushes the site into Level d – Very Heavy .