Year: 2023 | Month: December | Volume: 10 | Issue: 12 | Pages: 343-351
DOI: https://doi.org/10.52403/ijrr.20231237
Voltage Tap Changer of Power Transformer: Structure, Control and Application
Nguyen Thi Ngoc Dung
Electrical Faculty, Thai Nguyen University of Technology, Thai Nguyen, Viet Nam
ABSTRACT
This paper focuses on voltage tap changer of transformers to improve voltage quality in electric power systems. The structure and design of this unit will be mentioned with the capability to change the voltage ratio of the transformer in cases of having electric load at high voltage side and not having electric load at medium voltage side. A method to determine standard voltage taps for both high and medium voltage sides of three-winding transformers will be proposed in this paper to provide information for the controller and execute remote control. Moreover, the control structure of whole system, including local and remote-control modes, will be created for the problem of voltage tap changers. An experimental model will be designed to have a virtual calculation, information display and control signal for the problem of voltage tap. Experimental results will prove the ability to calculate standard voltage taps at high and medium voltage taps of a three-winding transformer using values of voltage source and electric loads. Moreover, voltage taps can be also displayed on a human-machine interface software, LCD screen and send control signal after being evaluated by operators. It helps to show scientific meanings of this research and provide an overview about calculating and controlling voltage taps before applying in real control systems.
Keywords: On-Load tap changer, Load tap changer, Remote control, Voltage quality, Voltage regulator, Voltage tap, Transformer, Three-winding power transformer.
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