Accurate assessment of lightning protection performance of extra high voltage transmission lines is important for transmission line design and different lightning protection. Based on the electro-geometrical model, this paper introduces the angle influence factor, and presents an algorithm for shielding failure trip-out rate of angle tower, and the existing algorithm is expanded. By establishing the three-dimensional geometric model of the angle tower, the electrical geometric relations of conductors and ground wires on both sides are analyzed, respectively, and the projection area algorithm for shielding failure is modified. To further verify the application value of the calculation algorithm, the change of the shielding failure trip-out rate of the typical angle tower with the bending angle of transmission line and the tower height in a 500 kV transmission line is analyzed. The analysis results show that the trip-out rate of the outside corner is higher than that of the inside one, and with the increase of the angle and the height of the tower, the trip-out rate shows an upward trend. When the tension tower height is 71.5 m and the angle increases from 0° to 80°, the outside shielding failure trip-out rate increased by 10.9% and the inside decreased by 9.3%. Compared with the classical electro-geometrical model calculation, the difference of trip-out rate is 4.3% when the bending angle is 80°. When the tangent tower height is 70 m and the angle increases from 0° to 40°, the shielding failure trip-out rate on the outside increased by 5.9% while the inside decreased by 6.2%. The research results provide a simple algorithm for solving bending transmission line and give some reference for lightning protection design of EHV transmission lines. © 2022 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

中文翻译：

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解决输电弯线屏蔽失效跳闸率的算法

准确评估特高压输电线路的防雷性能对于输电线路设计和不同的防雷保护具有重要意义。在电几何模型的基础上，引入角度影响因素，提出了一种角塔屏蔽失效跳闸率的算法，并对现有算法进行了扩展。通过建立角塔三维几何模型，分别分析两侧导体和地线的电气几何关系，修正屏蔽失效的投影面积算法。为进一步验证计算算法的应用价值，分析了500 kV输电线路中典型角铁塔屏蔽故障跳闸率随输电线路弯曲角度和铁塔高度的变化。分析结果表明，外角跳闸率高于内角，且随着塔角和塔高的增加，跳闸率呈上升趋势。当张力塔高度为71.5 m，角度从0°增加到80°时，外侧屏蔽失效跳闸率增加10.9%，内侧下降9.3%。与经典电几何模型计算相比，折弯角为80°时跳出率相差4.3%。当切线塔高为70 m，角度从0°增加到40°时，外侧屏蔽失效跳闸率增加5。9%，而内部则下降了 6.2%。研究结果为解决输电线路弯曲提供了一种简单的算法，为超高压输电线路的防雷设计提供了一定的参考。© 2022 日本电气工程师学会。由 Wiley Periodicals LLC 出版。