Overhead ground wires installed on transmission lines have been proved to be effective to protect conductors from direct lightning strokes, but ground wire breakouts due to icing are frequently reported. In order to prevent electric failure accidents caused by ground wire breakouts under icing conditions, unshielded transmission lines equipped with metal oxide arresters (MOAs) whole line have been proposed in high mountainous areas. Compared with ordinary transmission lines, lightning stroke risk of unshielded lines is much higher. In order to improve the lightning performance of unshielded lines, it is necessary to obtain the essential lightning energy absorption ability of the MOAs installed on unshielded lines. In this article, simulation model of unshielded 220 kV transmission lines equipped with MOAs is built, the influences of lightning parameters, striking occurrence point and grounding resistance on the absorbed energy of MOAs are analyzed. Based on Monte Carlo method, lightning trip-out rate of unshielded transmission lines are calculated, and suggested energy absorption ability of MOAs is proposed, which can give references for the improvement of power supply reliability of transmission lines.

中文翻译：

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配备金属氧化物避雷器的非屏蔽220 kV输电线路的雷电性能

安装在输电线路上的架空地线已被证明可有效保护导体免受直接雷击，但由于结冰导致地线断线的报道屡见不鲜。为防止结冰条件下因地线断线引起的电力故障事故，高山地区已提出全线配备金属氧化物避雷器（MOA）的非屏蔽输电线路。与普通输电线路相比，非屏蔽线路的雷击风险要高得多。为了提高非屏蔽线路的防雷性能，需要获得安装在非屏蔽线路上的MOA的基本雷电能量吸收能力。本文建立了配备MOA的非屏蔽220 kV输电线路仿真模型，分析了雷电参数、雷击发生点和接地电阻对MOA吸收能量的影响。基于蒙特卡罗方法，计算了非屏蔽输电线路的雷击跳闸率，提出了MOA的能量吸收能力建议，可为提高输电线路供电可靠性提供参考。