%0 Journal Article
%T Tap-changer diagnostics: Present state and new developments
%A Wetzer
%A Jos
%J -
%D 2019
%X Sa£żetak 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
%K diagnosis
%K dynamic resistance measurement
%K power transformer
%K tap-changer
%U https://hrcak.srce.hr/index.php?show=clanak&id_clanak_jezik=319271