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Original scientific paper

Reactor-type tap changers testing

Raka Levi
Goran Milojević
Edis Osmanbašić

Fulltext: english, pdf (388 KB) pages 82-88 downloads: 847* cite
APA 6th Edition
Levi, R., Milojević, G. & Osmanbašić, E. (2017). Reactor-type tap changers testing. Transformers Magazine, 4 (1), 82-88. Retrieved from
MLA 8th Edition
Levi, Raka, et al. "Reactor-type tap changers testing." Transformers Magazine, vol. 4, no. 1, 2017, pp. 82-88. Accessed 20 Jan. 2021.
Chicago 17th Edition
Levi, Raka, Goran Milojević and Edis Osmanbašić. "Reactor-type tap changers testing." Transformers Magazine 4, no. 1 (2017): 82-88.
Levi, R., Milojević, G., and Osmanbašić, E. (2017). 'Reactor-type tap changers testing', Transformers Magazine, 4(1), pp. 82-88. Available at: (Accessed 20 January 2021)
Levi R, Milojević G, Osmanbašić E. Reactor-type tap changers testing. Transformers Magazine [Internet]. 2017 [cited 2021 January 20];4(1):82-88. Available from:
R. Levi, G. Milojević and E. Osmanbašić, "Reactor-type tap changers testing", Transformers Magazine, vol.4, no. 1, pp. 82-88, 2017. [Online]. Available: [Accessed: 20 January 2021]

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.

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

Hrčak ID: 202379


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