VFTO对GIS中电子式互感器的电磁干扰研究

针对气体绝缘金属封闭开关设备（GIS）中特快速暂态过电压（VFTO）引起的电子式互感器电磁兼容问题，首先建立了基于逻辑判断的VFTO电磁骚扰源系统模型，对互感器端过电压信号的幅频特性进行了仿真分析，通过对比实验数据验证了系统模型的正确性；然后建立了GIS管道和电容分压型电子式电压互感器的三维模型，对VFTO产生的辐射干扰进行了仿真分析，辐射电磁场计算结果与已有文献报道的误差为8.3%。此外，通过优化互感器的物理结构进一步研究了VFTO辐射干扰的抑制措施，仿真结果表明所提措施的抑制率达到了72.4%。

Electromagnetic Interference of Electronic Transformer in GIS by VFTO

Aiming at the electromagnetic compatibility problem of electronic voltage transformer（EVT） caused by VFTO in GIS， this paper firstly establishes the system model of VFTO electromagnetic disturbance source based on logical judgment， conducts the simulation and analysis on the amplitude-frequency characteristics of the overvoltage signal at the transformer side， and compares the experimental data to verify the correctness of the system model. Then the three-dimensional models of GIS pipeline and electronic capacitive voltage transformer are built， and radiation interference generated by VFTO is simulated and analyzed. The error between the calculated results of radiated electromagnetic field and those reported in the literature is 8.3%. In addition， by optimizing the physical structure of the transformer， the suppression measures of VFTO radiation interference are further studied. The simulation results show that the suppression rate of the measures reaches 72.4%.