Research of over-voltage in air-core reactor based on waveform relaxation

With the increasing voltage class of power equipment, the turn number of winding equipment becomes more great and the coupling between the turns becomes stronger. As a result, it is difficult to solve circuit equation by analytical algorithm. This paper provides a method using waveform relaxation (WR) to solve the circuit equation. This method could be applied in calculation of complex computation, such as turn- to-turn voltage calculation of winding equipment and flow calculation of big power grid. Before calculation, this paper provide a method to calculate electromagnetic parameters of an air-core reactor. At last the paper presents a calculating example and experiment. From the experiment, the method provided in this paper proves its veracity and superiority.