Iec 60815-2 Pdf

IEC/TS 60815-2 is a Technical Specification titled "Selection and dimensioning of high-voltage insulators intended for use in polluted conditions – Part 2: Ceramic and glass insulators for a.c. systems" . It provides specific guidance for choosing and sizing ceramic (porcelain) and glass insulators used in outdoor high-voltage AC systems exposed to environmental contamination. Core Content and Scope The document builds upon the general principles established in IEC/TS 60815-1 (which defines pollution classes) to offer practical engineering guidelines for specific material types. iTeh Standards Insulator Types : Specifically covers materials for AC systems. Design Focus : Helps engineers determine relevant dimensions, such as creepage distance , and select appropriate profiles (e.g., standard vs. "fog type") based on the site's pollution severity. Key Sections : Typically includes scope, normative references, pollution severity levels, the relation between pollution and specific creepage distance, and profile characterization parameters. Appendices : Often contains practical tools like a questionnaire for evaluating polluted areas and information on maintenance practices like greasing and washing. Relationship to Other Parts The IEC 60815 series is divided by material and system type: IEC/TS 60815-2 - PLSLine

The IEC 60815-2 standard is a critical technical specification for the electrical power industry, specifically titled "Selection and dimensioning of high-voltage insulators intended for use in polluted conditions – Part 2: Ceramic and glass insulators for a.c. systems". This document provides a systematic framework for engineers to select and size insulators—such as porcelain or glass—based on the specific environmental pollution levels they will face in service. Core Purpose and Scope The primary goal of IEC 60815-2 is to prevent insulator flashovers caused by environmental contamination like salt spray, industrial dust, or desert sand. It specifically covers outdoor high-voltage insulators used in AC systems, including: Overhead line insulators (cap-and-pin, long rod). Substation and equipment insulators (post insulators, bushings). Key Technical Concepts The standard guides users through a multi-step process to determine the necessary physical dimensions of an insulator: IEC TS 60815-2:2025

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Technical Report: Analysis of IEC 60815-2 – Selection and Dimensioning of High-Voltage Insulators for Polluted Conditions – Part 2: Ceramic and Glass Insulators for AC Systems 1. Introduction IEC 60815-2:2008 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. The standard replaces the older IEC 60815 (1986) and introduces more refined pollution classes and a systematic approach to determining the required Unified Specific Creepage Distance (USCD). 2. Scope iec 60815-2 pdf

Applicable to: Ceramic (porcelain) and glass insulators for AC systems > 1,000 V. Frequency: 50 Hz and 60 Hz. Conditions: Naturally polluted environments (industrial, desert, coastal, agricultural dust, etc.). Not covered: DC systems (see IEC 60815-3), polymeric insulators (see IEC 60815-4), or indoor insulators under clean conditions.

3. Key Terminology (as defined in the standard) | Term | Meaning | |------|---------| | USCD | Unified Specific Creepage Distance – creepage distance (mm) divided by √3 × nominal line-to-line voltage (kV). Units: mm/kV. | | SPS | Site Pollution Severity – a classification of pollution levels at the installation site. | | DD | Deposit Density (mg/cm²) – Non-soluble deposit density. | | ESDD | Equivalent Salt Deposit Density (mg/cm²) – Soluble pollution converted to equivalent NaCl. | | Creepage distance | Shortest distance along the insulator surface between metal fittings. | 4. Pollution Classes (SPS Levels) IEC 60815-2 defines four main Site Pollution Severity (SPS) classes for AC: | SPS Class | Typical Environment | ESDD (mg/cm²) | Recommended USCD (mm/kV) | |-----------|---------------------|---------------|--------------------------| | a – Light | No industrial, inland, low density housing | < 0.03 | 16 – 20 | | b – Medium | Industrial areas, moderate coastal | 0.03 – 0.10 | 20 – 25 | | c – Heavy | Heavy industry, high coastal salt, desert with dust | 0.10 – 0.60 | 25 – 31 | | d – Very Heavy | Desert with salt/conductive dust, sea spray, high ESDD | 0.60 – 2.0 | 31 – 43+ |

Note: For very severe cases (>2.0 mg/cm² ESDD), custom dimensioning or mitigation (e.g., washing, coating) is required. Core Content and Scope The document builds upon

5. Correction Factors The standard introduces correction factors to adjust USCD based on:

Insulator profile (standard, anti-fog, deep-ribbed). System voltage (higher voltages may need increased creepage). Diameter effect (larger diameters require longer creepage). Number of insulator units (for cap-and-pin strings).

Example: Shape Factor (K₁)

Standard profile: K₁ = 1.0 Anti-fog profile: K₁ = 0.9 (more efficient) Deep-ribbed: K₁ = 0.8 – 1.0

6. Selection Procedure (Step-by-Step from Standard)