Original scientific paper

Reactor-type tap changers testing

Raka Levi
Goran Milojević
Edis Osmanbašić

Abstract

This paper discusses DVtest or Dynamic Resistance Measurement, a new diagnostic method used in detecting on load tap changer (OLTC) operational problems, as applied to reactor-type tap changers. Several cases of tap changer problems are presented, which were detected using the DVtest method – a high speed recording of a DC test current as the OLTC goes from tap to tap. The focus of the article is on the reactor-type tap changers. These reactor OLTC constructions apply Preventive Autotransformers (PA) for current control instead of resistors. Specific features in the current traces due to this particularity are explained. Finally, the article presents a discussion of the principles, DVtest features and defect cases for tap changers in a series transformer/booster arrangement.

Keywords

power transformer; tap changer; DRM; DVtest; reactor; transformer; booster

Hrčak ID:

202379

URI

https://hrcak.srce.hr/202379

Publication date:

8.1.2017.

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