分析认为，雷电击中大树产生的雷电反击和跨步电压是造成这起雷灾的主要原因。
According to the analysis, the back flashover and the step voltage formed when the lightning strikes a tree are the main causes of the disaster.
采用数值计算方法分析了垂直接地极对接地系统的接地电阻、接触电压及跨步电压等的影响。
The influences of vertical grounding electrodes on grounding resistance, step and touch voltages were analyzed numerically.
安全分析表明，在解决用户跨步问题的前提下，没有降低模型的安全性。
Through the security analysis, the model has settled users' bestriding problem yet still achieved security property.
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