): The ratio of the total surface distance to the straight-line air gap.
: The standard analyzes how different shapes (e.g., standard, anti-fog, or open profiles) perform under various types of pollution like salt spray or industrial dust.
(Note: A minor typo – "iec 60815-15-2 pdf" – sometimes refers to the correct standard IEC 60815-2, which is part of the broader 60815 family. See clarification below.) iec 60815-2 pdf
The PDF provides exact mathematical equations to correct creepage distances based on altitude, insulator diameter (larger diameters collect more pollution), and mounting angles (horizontal vs. vertical strings).
IEC TS 60815-2 is more than just a technical document; it is a comprehensive design guide. Specifically, it details the selection process for ceramic and glass insulators in AC systems, helping engineers determine the necessary dimensions to prevent pollution-related flashovers. ): The ratio of the total surface distance
Note: These values are reference starting points. The standard provides curves and tables to adjust these based on specific insulator profiles.
Standard documents like IEC 60815-2 are copyrighted and generally require purchase. You can find the official version through these sources: See clarification below
| Pollution Level | Typical Environments | Reference $L_ref$ (mm/kV) | | :--- | :--- | :--- | | | Desert areas, low industrial activity | 16.0 | | b) Light | Rural areas, minimal industrial influence | 20.0 | | c) Medium | Industrial suburbs, coastal areas with moderate sea spray | 25.0 | | d) Heavy | Heavy industrial zones, dense chemical pollution | 31.0 | | e) Very Heavy | Desert dust storms, direct salt spray | 40.0 |
This rigorous process ensures that the selected insulator will have sufficient surface length to withstand the voltage stresses in its specific contaminated environment, greatly reducing the risk of pollution flashovers.
Published by the International Electrotechnical Commission, this Technical Specification provides critical mathematical guidelines to prevent contamination-induced flashovers. Outdoor grid operators rely heavily on this framework to specify the necessary creepage distances of electrical infrastructure in marine, industrial, and desert areas. Core Structure of the IEC 60815 Series
Where to buy the PDF: