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Tap-changer diagnostics: Present state and new developments

Jos Wetzer ; DNV GL - Energy

Puni tekst: engleski pdf 471 Kb

str. 58-63

preuzimanja: 610



The primary function of power transformers is to transform voltage levels for transmission and distribution. Often, transformers are equipped with a device to adjust the voltage ratio by changing the turns ratio: the tap-changer. About 30% of all European substation transformer failures are attributed to tap-changer failure, as well as about 22% of the failures in which a fire or explosion has occurred. Although the contribution of tap-changer failures has decreased over the years, it justifies appropriate measures to timely identify tap-changer defects and mitigate failure risks. In this paper, we present an overview of tap-changer diagnostic options, and discuss recent developments, in particular concerning improved techniques for dynamic resistance measurement.

Ključne riječi

diagnosis, dynamic resistance measurement, power transformer, tap-changer

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