Theoretical aspects of regulating the voltage of power transformers are considered and conclusions are drawn about the need to make adjustments to GOST 30830-2002, as well as changes to the applied terminology and formulas are proposed. A detailed description of the regulation modes of the secondary voltage of a three-winding transformer is given, which is currently missing in the educational-methodical and scientific-technical literature. Formulas are proposed for determining the branch transformation coefficient, expressed not through the branch voltage, but through the number of turns of the windings. Thus returning to the regulation process its physical meaning, the main purpose of this replacement is the ability to operate with the number of turns in any regulation mode. Methods have been developed for choosing the necessary regulatory branch, which correspond to the true physical meaning of the voltage regulation process, consider both options for placing the on-load tap-changer on the windings of a three-winding transformer and allow them to be used in any regulation mode.

Authors: A. G. Lavrov, E. N. Popov

Direction: Electrical Engineering

Keywords: Three-winding transformer, voltage control, alternating magnetic flux, control modes, transformation ratio

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