: Some terms and definitions have been either modified or newly introduced. Key terms now defined include USCD (Unified Specific Creepage Distance) , RUSCD (Reference Unified Specific Creepage Distance) , nominal creepage distance, and creepage factor.
Areas with low-density housing or light industry, sheltered from marine winds.
is the second part of the IEC 60815 series. It provides specific guidelines for the selection and dimensioning of ceramic and glass cap-and-pin, long rod, and post insulators used in AC overhead lines and substations under polluted conditions.
: Typically includes scope, normative references, pollution severity levels, the relation between pollution and specific creepage distance, and profile characterization parameters. Appendices
The SPS class is validated by measuring two primary metrics on-site over a minimum 12-month period:
Most utilities have a rule of thumb: "Use 25 mm/kV for clean areas, 31 mm/kV for polluted." IEC 60815-2 blows that simplification out of the water.
"The Site Pollution Severity (SPS) is hitting 'Very Heavy' levels," his junior engineer, Sarah, shouted over the wind.
The standard builds on the general principles established in IEC 60815-1 and focuses on the following areas for glass and porcelain:
If an insulator profile fails to meet these geometric optimization ratios, a correction factor ( Kacap K sub a
| Standard | Title | |----------|-------| | | General principles, definitions, and pollution classes | | IEC 60815-3 | DC application for ceramic/glass insulators | | IEC 60815-4 | Polymeric insulators for AC/DC | | IEC 60507 | Artificial pollution tests (salt fog) | | IEC 60513 | Fundamental design considerations for HV insulators |