Simulation study of large power transformer advanced winding model in high frequency

According to the propagation characteristic of high frequency signal in large power transformer winding, an advanced winding model is presented in this paper. Utilizing the complex equation and mesh calculation method, the transfer function is deduced theoretically. Frequency characteristic is studied through the small-signal tool in Saber simulation software, meanwhile the characteristic parameters in winding model are discussed to prove how to influence frequency characteristic. According to the variation of the frequency characteristic, it could improve measurement accuracy of partial discharge (PD) on-line monitoring and winding deformation for large power transformer.