Lightning shielding failure is the main factor to threat the safety and reliability of EHV transmission lines.
雷电绕击是危及超高压输电线路安全稳定运行的主要原因。
Several units calculate the UHV transmission line shielding failure trip ratio with the leader propagation model (LPM).
国内外也有多个单位研究使用先导传播模型（LPM）计算特高压线路雷电绕击跳闸率。
The electrogeometric model (EGM) described with striking distance has been widely used in the shielding failure analysis of transmission line.
使用击距描述的电气几何模型广泛用于输电线路的雷电绕击分析。
With such model the effect of tower structure, lightning current amplitude, angle of the lightning incidence, as well as the ground angle on the shielding failure rate are analyzed.
应用改进的电气几何模型分析了输电线路杆塔结构、避雷线和导线的布置、雷电流的幅值、地面倾角对绕击率的影响。
This passage also points out that the way of enlarging ground wire's equivalent radius can reduce the rate of shielding failure and enhance the security and stability of the transmission lines.
本文提出增大避雷线的半径的方法，可以减少输电线路的绕击率，从而提高输电线路的安全、稳定性。
The principal cause of lightning stroke failures occurred in UHV transmission lines is the shielding failure, so it is suggested to adopt the negative protecting Angle for UHVDC transmission lines.
引起特高压输电线路雷击故障的主要因素是雷电绕击，建议特高压输电线路采用负保护角运行。
Shielding failure is the main reason to cause flashover of the UHV transmission line, so that the shielding angle of grounding wires should be reduced, especially in mountain area.
绕击是造成特高压线路跳闸的主要原因，尤其在山区应适当减小地线保护角。
Shielding failure is the main reason to cause flashover of the UHV transmission line, so that the shielding angle of grounding wires should be reduced, especially in mountain area.
绕击是造成特高压线路跳闸的主要原因，尤其在山区应适当减小地线保护角。
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