特高压断路器短路开断试验零前电流畸变的仿真及应用

Application and Simulation Computations of Current Zero Distortion for UHV Circuit-breaker Short Circuit Test

高压断路器在开断短路电流时,触头间建立起的电弧电压和试验回路的作用,使得电流过零前短路电流波形发生畸变。依据IEC 62271-101:2012附录A,理论分析了电弧电压为恒值和线性增长时的畸变电流表达式,以MATLAB/Simulink仿真环境为平台,建立了电弧电压为恒值和线性增长时短路电流的动态数学仿真模型,并以1 100 k V/63 k A试验方式T100a断路器为例应用仿真模型计算了电弧电压对电流半波幅值和持续时间的衰减百分比,计算结果可以为断路器短路试验时提供理论参考。

During the current interruption process, the arc voltage across the contacts causes the prospective short-circuit current distorted as the current approaches zero. According to the annex A of IEC 62271-101：2012, theoretical analysis the distortion current expressions with the constant arc voltage and linearly rising arc voltage respectively. Using the MATLAB/Simulink platform, established the distortion current dynamic mathematical simulation model which is respectively with constant arc voltage and linearly rising arc voltage. Furthermore, we have used the dynamic mathematical simulation model to calculate the reductions of the current amplitude and the loop duration which are caused by the arc voltage based on the test duties T100 a for 1 100 k V/63 k A circuit breaker. The results of calculation can provide theoretical reference when circuit breaker short circuit test.