The Study of the Voltage Fluctuation of On-load Capacity Regulating Transformer while Switching Capacity

In this paper, the working principle of capacity regulating transformer was analyzed firstly. Based on applying the idea of connecting with transition resistance, the mathematical simulation models were established in Matlab Simulink software. According to the simulation calculation under different resistance parameters, transformer capacity and load conditions, this paper got the final conclusion: the voltage fluctuation rate grows up with transition resistors on the side of low voltage increasing but this fluctuation can be barely influenced by capacity of the transformers and transition resistors on the side of high voltage. The voltage fluctuation rate grows when the load increases. Finally, this paper analyzed the influences that capacity regulating transformer makes on consumers and evaluated the voltage sag under different simulated conditions by studying typical voltage sag curves.