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IEC 60815: Guide For The Selection And Dimensioning Of High ....13

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IEC 60815: A Guide for Choosing and Sizing High-Voltage Insulators for Polluted Conditions

High-voltage insulators are essential components of power transmission and distribution systems, as they provide electrical insulation and mechanical support for conductors and equipment. However, insulators can be affected by various types of pollution, such as dust, salt, industrial emissions, and biological growths, which can reduce their performance and lead to flashovers or failures.

To prevent such problems, insulators need to be selected and dimensioned according to the specific pollution conditions of each site. This is the purpose of IEC 60815, a technical specification that provides guidance and principles for the selection and dimensioning of high-voltage insulators intended for use in polluted conditions.

What is IEC 60815

IEC 60815 is a technical specification developed by the International Electrotechnical Commission (IEC), a global organization that prepares and publishes international standards for electrical, electronic, and related technologies. IEC 60815 was first published in 1986 as IEC 815, and was revised in 2008 as IEC TS 60815.

IEC 60815 consists of five parts:

Part 1: Definitions, information and general principles

Part 2: Ceramic and glass insulators for a.c. systems

Part 3: Polymer insulators for a.c. systems

Part 4: Ceramic and glass insulators for d.c. systems

Part 5: Polymer insulators for d.c. systems

Each part covers different types of insulators and systems, and provides specific methods and criteria for the selection and dimensioning of insulators based on the pollution site severity (SPS), which is a measure of the pollution level at a given site.

How does IEC 60815 work

The main steps involved in applying IEC 60815 are:

Determining the pollution site severity (SPS) by collecting and analyzing pollution data, such as equivalent salt deposit density (ESDD), non-soluble deposit density (NSDD), leakage current, rainfall, humidity, wind speed, etc.

Selecting the appropriate part of IEC 60815 according to the type of insulator and system.

Using the tables and graphs provided in each part to find the required unified specific creepage distance (USCD), which is a parameter that indicates the minimum creepage distance per unit voltage that an insulator should have to withstand the pollution level at a given site.

Choosing an insulator that has a creepage distance equal to or greater than the USCD multiplied by the system voltage.

Verifying the suitability of the chosen insulator by performing tests or comparing with existing operational experience.

What are the benefits of using IEC 60815

Using IEC 60815 can help power system operators and engineers to:

Improve the reliability and safety of power transmission and distribution systems by reducing the risk of flashovers or failures due to pollution.

Optimize the design and cost of insulators by avoiding excessive over or under sizing.

Select the most suitable type of insulator for different applications and environments.

Harmonize the practices and criteria for insulator selection and dimensioning across different countries and regions. 061ffe29dd


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