潜供电弧的仿真分析

Simulation and Analysis of Secondary Arc

介绍了超高压输电线路上产生潜供电弧的机理。基于电路原理得出恢复电压和潜供电流的数学表达式,运用MATLAB编程得到恢复电压和潜供电流的数值。通过SIMULINK组建模块,仿真整个电路,得到恢复电压和潜供电流的波形图和数值。分析快速接地开关抑制潜供电弧的机理,在线路上安装快速接地开关,选用电动弹簧操作机构来提高HSGS的关合速度,降低弧道上的潜供电流和恢复电压,减少了潜供电弧的熄灭时间,从而确保了单相自动重合闸的成功。

This paper presents the theory of generating secondary arc current in ultra-high-voltage （UHV） power transmission system. The mathematic representations of recovery voltage and secondary arc current can be obtained based on circuit principle, and the values can also be obtained by using MATLAB. Based on SIMULINK the whole circuit has been simulated, thus, the waveshapes of recovery voltage and secondary arc current are obtained. The effect of secondary arc suppression is studied when the high speed grounding switch （HSGS） is adopted. The mechanism of secondary arc restriction by HSGS is analyzed. Motor-driven spring operating mechanism has been used to enhance breaking velocity of HSGS. The magnitude of the secondary arc current and recovery voltage in arc path are obviously reduced after using HSGS on line. Then it reduces the extinction time of the secondary arc and assures successful single-phase auto reclosure.