The PDF manual contains exact mathematical formulas, correction curves, and geometric limit tables needed to calculate USCD without errors.
This is the fundamental design metric provided by the standard. It defines the minimum leakage path (creepage distance) required per kilovolt of system voltage (
Once the SPS class is established, the standard provides a base USCD value (expressed in mm/kV, where the voltage is the highest phase-to-phase system voltage). Severity Level Base USCD Requirement (mm/kV) Very Light B C D E Very Heavy iec 60815-2 pdf
SPS is quantified by measuring the and Non-Soluble Deposit Density (NSDD) , or by tracking the Site Equivalent Salinity (SES) .
The fundamental objective of IEC 60815-2 is to guide engineers in choosing the appropriate glass or ceramic insulator design based on the specific pollution severity of a deployment site. The standard moves away from rigid, legacy lookup tables and establishes a sophisticated, deterministic engineering process. The selection methodology follows these primary steps: 1. Assessment of Site Pollution Severity (SPS) Severity Level Base USCD Requirement (mm/kV) Very Light
: This is arguably the most comprehensive "paper" on the subject. It was developed by the same working groups that informed the IEC 60815 series. It provides the scientific background for the move from "leakage distance" to the "Unified Specific Creepage Distance" (USCD) approach used in the standard.
IEC 60815-2 is titled "Selection and dimensioning of high-voltage insulators intended for use in polluted conditions – Part 2: Ceramic and glass insulators for a.c. systems." The selection methodology follows these primary steps: 1
The primary objective of IEC 60815-2 is to give engineers the tools to determine the necessary dimensions of insulators—specifically the Unified Specific Creepage Distance (USCD)
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[Collect Site Pollution Data (ESDD/NSDD)] │ ▼ [Identify Site Pollution Severity (SPS) Class A to E] │ ▼ [Select Base USCD Value from IEC 60815-2 Tables] │ ▼ [Apply Geometric Correction Factors for Insulator Profile] │ ▼ [Calculate Final Required Creepage Distance for the System Voltage] How to Access the IEC 60815-2 PDF