基于气隙电阻变化模型的单气隙局部放电仿真计算

为了对气隙局部放电的不同击穿过程和不同时间过程进行仿真研究,采用了一种按照局部放电物理本质修正的基于气隙电阻变化的单气隙局部放电仿真模型.仿真研究了气隙贯穿放电、气隙沿面放电以及气隙贯穿放电与气隙沿面放电同时发生3种不同的放电过程,研究了微秒级放电、亚纳秒级放电、纳秒级放电等3种不同的气隙击穿时间对放电波形的影响规律,研究了气隙放电中电子雪崩过程的放电特征.发现不同放电击穿过程和不同时间过程的放电波形之间存在差异,采用电子雪崩控制放电过程可以得到与实际测量波形十分接近的仿真结果,为今后进一步研究气隙放电的物理化学过程奠定了基础.

Simulation Calculation of Partial Discharge in Single Void Using Variable Void Resistance Model

In order to simulate different breakdown processes and different time processes of partial discharge (PD) in voids, the variable void resistance model based on the physical inherence of PD in voids was used. Three different discharge processes (void breakdown, interface discharge of void, breakdown and interface discharge at the same time) and three different breakdown time processes (microsecond order, sub-nanosecond order, and nanosecond order) were studied respectively to obtain their discharge properties. Moreover, electron avalanche in discharge process was simulated. The discrepancies among PD waveforms of different discharge processes and different breakdown time were found. The simulation results under the condition of electron avalanche are very similar to the measured waveforms, which is the foundation of further studies on the physical and chemical process of PD.