Authors: F.S. Nepsha, V.M. Efremenko

Title of the article: Evaluation of the influence of the on-load tap-changing device on the level of active power losses in power transformers

Year: 2017, Issue: 4, Pages: 84-89

Branch of knowledge: Electrical engineering

Index UDK: 621.311:621.316

DOI: 10.26730/1999-4125-2017-4-84-89

Abstract: In distribution networks of 6-35 kV, one often has to deal with the problem of voltage regulation under conditions of changing electrical loads. To maintain the voltage on the 6-35 kV busbars in similar conditions, the on-load tap-changing devices are used. However, in the process of calculating and optimizing the electric modes of distribution networks, the changes in the level of active power loss in the transformer during tap changing on the on-load tap-changing device are not taken into account by the criterion of minimum losses (consumption) of active power, which may affect the quality of the optimization results. In this regard, the analysis of the change in the level of active power loss in the transformer during tap changing of the on-load tap-changing device is an actual scientific and technical task. In this paper, the authors present the results of an analysis of the change in the level of active power losses in the transformer depending on the position of the on-load tap-changing device and the load factor of the transformer. The authors obtained graphical dependences of the change in the losses of active power in the transformer with a change in the voltage within the dead zone of the automatic voltage regulating control relays. On the basis of the analysis, the most optimal positions of the on-load tap-changing device with different load factors of the transformer were established, and conclusions were drawn about the need to take into account the switching of the on-load tap-changing device in the process of optimization of the voltage level in the network by the criterion of minimum losses (consumption) of active power.

Key words: voltage regulation power transformer on-load tap-changing devices active power losses voltage level optimization

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