Transformers Magazine, Vol. 4 No. 1, 2017.
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
Publication date:
8.1.2017.
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