Simulating calculation of transient voltage distribution for power transformer with software PSPICE

Abstract

Power transformer plays a very important role in power system. Moreover, dielectric strength of power transformer windings under over voltage is a vital standard to test. Thus, in order to design high-quality and low cost power transformer, it is compulsory that transient voltage distribution in power transformer windings under over voltage is acquired in the designing stages. In most paper, transformer windings are simplified to circuit model. Then, it is programmed and transient voltage distribution is achieved. To be sure, some method do achieved satisfied calculation result. However, the process is rather complex. Meanwhile, the result is not intuition at all. Therefore, a transient circuit model used in simulating calculation with PSPICE is described. The circuit model is taken account of loss in transformer windings and simplifies parameters. In addition, transient analysis function and graphical interfaces of EDA software-PSPICE is used to simulate the transient voltage distribution of that power transformer under lighting over voltage as well as the transformer is switched in the no loaded circuits. The simulated is agreement with measured results perfectly, which show that the model can represent transient response of the transformer and simplifies the process of calculation