Critical evaluation of ansi pollution test for multi-unit metal-oxide surge arresters
✍ Scribed by R. S. Shivakumara Aradhya; B. I. Gururaj; M. Ramamoorty
- Publisher
- John Wiley and Sons
- Year
- 2007
- Tongue
- English
- Weight
- 677 KB
- Volume
- 5
- Category
- Article
- ISSN
- 1430-144X
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✦ Synopsis
Standardization of pollution testing of metal oxide surge arresters (MOA) is being attempted by diflerent research groups throughout the world through field tests and laboratory investigations. The non-uniform wet contamination method of ANSI standard C 62.11, 1987, which is reported to have good repeatability for temperature rise during laboratory tests, has been adopted by many countries including India. Also, much work is being done in some European countries on other methods. This paper gives a critical analysis of the ANSI method based on results of computer simulation studies and supporting laboratory tests. The sensitivity of the arrester element temperature rise on the atmospheric humidity during ANSI tests and possibility of representing the site severity have been established for the first time. It is concluded and suggested that tofurther improve the repeatability of ANSI test results, it may be desirable to stipulate a range of atmospheric humidity levels in the laboratory which may be of the order of 70 % to 80 %.