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WG C4.303 Pollution and Environmental Influence on Electrical Performance

Introduction:

The Achilles Heel of every transmission or distribution line and outdoor substation is the external insulation. This insulation is the least glamorous component of these installations, but is the part that is the most susceptible to failure and disabling of the system if proper attention has not been given to its design, monitoring and maintenance.

Cigré has a long and important history of close involvement with manufacturers and utilities in this vital area. In the late 1970's, Cigré produced seminal documents in which the mechanism of pollution-related failure of external insulation was identified and the means of selection and design of porcelain and toughened glass insulation was set out. This was followed by authoritative publications on the assessment of site severity and the monitoring of polluted insulators and laboratory testing on insulators. The introduction of polymeric insulators was marked by wide-ranging discussion, stimulated by Cigré, and ultimately the publication of documents relating to the testing and monitoring of polymeric insulators. Insulator performance in snow and ice has also been published. Very recently a comprehensive and definitive literature review on all matters relating to external insulation has been published as a Cigré Brochure. Cigré has always worked closely with IEC on matters relating to outdoor insulation and the experts within Cigré are currently playing a significant role in the revision of IEC 60815 which deals with the design and selection of high voltage insulation.

In the former structure of Cigré these experts came together under Working Group 33-04, “External Insulation". In the restructuring, these experts are part of a very broad working C4.3.03 dealing with the withstand characteristics of electrical insulation. Gaseous and solid insulation are addressed as well as external insulation and working group meetings do not allow sufficient time to address the issues of external insulation adequately. In addition, employers are reluctant to support their specialists in participation in such a broad-based working group.

The formation of this working group will ensure that Cigré remains in the leading role in the matter of external insulation.

Scope:

The working group will focus on:

  1. The advancement of knowledge on the mechanisms which influence the electrical performance of high-voltage outdoor insulation systems. This includes all environmental influences as well as the properties of the insulators. Ageing and degradation of insulation and its impact on system performance are of particular concern.
  2. The publication of guidelines for the design and selection of outdoor insulation applicable to high-voltage ac and dc systems.
  3. The publication of recommendations for the testing and monitoring of outdoor insulation.
  4. Close monitoring of all developments relating to the manufacture, application and testing of external insulation, with a view to anticipating the formulation of recommendations and guidelines for the industry.
  5. Close liaison with IEC TC36 on all matters relating to outdoor insulation.
  6. Close liaison with the equipment study committees within Cigré to ensure effective collaboration on all matters pertaining to outdoor insulation.
  7. Close liaison with the Study Committee D1 to ensure effective collaboration on all matters pertaining to outdoor insulation.
  8. Liaison with Study Committee B2, in particular with the taskforce dealing with outdoor test stations is important.
  9. Liaison with the IEEE Lightning & Insulator Subcommittee’s Working Group on Application and Inspection of Insulators
Convener: C. Engelbrecht (Netherlands)
 
Publications:

TB518: OUTDOOR INSULATION IN POLLUTED CONDITIONS: GUIDELINES FOR SELECTION AND DIMENSIONING PART2: THE DC CASE (Published: 2012-12)

TB555: ARTIFICIAL POLLUTION TEST FOR POLYMER INSULATORS: RESULTS OF ROUND ROBIN TEST (Published: 2013-10)