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Published Article / ENY-ARTICLE-2012-324

Impulse flashover of strings containing standard and semi-conducting disc insulators

Chrzan, K L (Wroclaw University of Technology) ; Elsaesser, O (University of Stuttgart)


Abstract: Insulators with semi-conducting glazes (SCG insulators) are used mainly in heavily polluted areas. Besides the well known application under such conditions, SCG insulators can be used for voltage upgrading in long strings supporting or replacing the grading electrodes. The paper describes electrical properties of SCG insulators including a one year-test carried out in a pollution test station. Measurements of the flashover voltage of insulator strings containing standard and SCG insulators under lightning and switching impulses are shown. The positive switching impulse flashover voltage of a string including 7 units of SCG insulators is about 19% higher than this of a string containing 7 standard insulators. The switching impulse flashover voltage of a string including 5 standard insulators and 5 SCG insulators is about 10% higher than of a string with 10 standard insulators. Under lightning impulse stress only small difference in flashover voltage is measured.

Keyword(s): cap and pin insulators ; voltage distribution
Note: 12th International Symposium on High Voltage Engineering ISH, Bangalore 2001, paper 5-44

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Record created 2012-05-09, last modified 2012-05-09

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