A Novel Model of Arcless On-Load Tap-Changing Transformer and its Simulation

L. Zhang, S. Chen, X. Li, and W. Wang (PRC)

Keywords

Regulations, onload tapchanging, thyristor switch, simulation

Abstract

In this paper, a novel arcless on-load tap-changing model is proposed, it adopts inverse paralleled high-power thyristor pair to be control switch and regulate the output voltage by switching in corresponding tap-changing windings, and also use thyristor’s zero-current cut-off character to cancel transition resistance inserting process to simplify the regulation steps effectively. A 35kV/10.5kV 5000kVA two–winding transformer model is built by MATLAB, and the simulation wave form of tap-changing process has proved that this model is correct.

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