By programming simulation, the single-grade and multi-grade circuits are analyzed, and it is the best moment for thyristor to switch on when the voltage of capacitor to be shorted is zero.

采用编程仿真的方式，对单级电路和多级电路分析后，提出了晶闸管开关最佳接入时刻为被短接电容电压为零时；

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The paper describes the coordination of the multi-grade surge protection, the suppression of the transfer over voltage, as well as the calculation a…

简单介绍了级间配合，抑制横向过电压的产生，以及接地阻抗的简单计算和正确选用等，以达到对电源系统的有效防雷保护。

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