中文摘要：

变电站中隔离开关操作过程产生的瞬态电磁场是变电站中重要的电磁干扰源之一。为了量化互感器端由隔离开关操作产生的电磁骚扰,分析电磁暂态过程,建立了具有分布参数的母线分析模型,以及隔离开关电弧熄灭和重燃的分析模型,对单变单回路运行方式下的电网模型进行数值计算,综合评估互感器上过电压和过电流特征水平。仿真结果表明,在合闸全过程中,母线电流由一系列锥形衰减振荡波组成,隔离开关与断路器之间跳变的阶梯波对地电压最大值为586.2 k V,传导至变压器的骚扰电压衰减至514.4 k V,不会造成变压器主绝缘击穿。骚扰信号频率特性取决于母线和短线的长度,频率集中在32.87 MHz之内。

英文摘要：

The transient electromagnetic field generated by isolation switch＇s operation is one of the important sources of electromagnetic interference in substation. To evaluate the level of electromagnetic disturbance at the primary side of the transformer, we analyzed the electromagnetic transient process. Then, we established models of distributed parameter in bus and models of switching arc＇s extinguishing and restriking. Based on these models, numerical calculations of power network model under the operation mode of single-phase transformer and single circuit line were conducted, and characteristics of over-voltage and over-current were evaluated synthetically.The simulation results demonstrate that the bus current is composed of a series of cone-shaped damped oscillatory waves, the maximum voltage to ground among jump waves between isolation switch and circuit breaker is 586.2 kV, and the disturbance voltage conducted to transformer decreases to 514.4 kV, which will not cause insulation breakdown of main transformer. Moreover, interference signal＇s frequency is determined by the length of the bus and the short line, and is limited in the range of 32.87 MHz.