局部放电脉冲在单绕组变压器中传播过程的仿真分析

SIMULATION ANALYSIS ON PROPAGATION OF PARTIAL DISCHARGE PULSES IN SINGLE-WINDING TRANSFORMER

变压器所特有的绕组结构对局部放电脉冲的传播过程有重要影响。对传播过程的深入研究有助于正确理解测得信号所包含的信息。文章建立了局部放电脉冲在单绕组变压器绕组中传播过程的仿真计算模型,并结合不同放电位置计算了脉冲传播途径的传递函数。不同位置发生放电时,可利用同一测量点所测信号根据其幅频特性的不同来确定放电位置。

In power transformer the propagation of partial discharge pulses is greatly influenced by their peculiar winding structures, so the deep study of the propagation process isconducive to proper understanding of the information involved in the measured signals. According to the simplified case ofsingle-winding transformer a simulation model for thepropagation process of PD pulses in transformer winding isestablished and for different discharging position the transfer functions of propagation path from PD location to measuring terminals are calculated. When the discharge occurs at different position, the discharge position can be located by the difference of amplitude-frequency characteristic of the signal measured at the same point.