Authors: A.V. Gerasimuk, I.Y. Semykina, M.V. Kipervasser

Title of the article: Calculation of equivalent circuit parameters for a split-winding transformer taking into account an on-load tap-changer in a higher-voltage winding

Year: 2019, Issue: 2, Pages: 52-59

Branch of knowledge: 09.05.03 Electrotechnical complexes and systems

Index UDK: 621.313

DOI: 10.26730/1816-4528-2019-2-52-59

Abstract: The authors propose a method aimed at calculation of equivalent circuit parameters for a split-winding transformer that takes into account an on-load tap-changer in a higher-voltage winding. There are detailed derivation of basic dependencies and formulas in the article, founding the proposed method. The text presents the modifications of transformer parameters recounting procedure for middle and limit positions of the on-load tap-changer in case of using as an input data short-circuit test and no-load test of a transformer provided by its producer and in case of partial absence of such information. The transformer resistances have been calculated for limit and zero positions of the on-load tap-changer in two ways: the first is based on certified value of short-circuit voltage at limit positions of the on-load tap-changer; the second one uses calculations relayed on the linear dependence between short-circuit voltage and regulating range of the on-load tap-changer. The transformer resistances have been calculated for limit and zero positions of the on-load tap-changer in two ways: the first one puts to use the certified value of short-circuit voltage at limit positions of the on-load tap-changer; the second one uses calculations relayed on the linear dependence between short-circuit voltage and a regulating range of the on-load tap-changer. The final part of the article contains a comparative analysis of the obtained results and conclusions about the accuracy of the proposed method.

Key words: transformer split-winding equivalent circuit on-load tap-changer

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