通过建立35kV 线路的仿真模型,研究线路在有避雷线无避雷器、无避雷线有避雷器以及有避雷线和避雷器这3种情况下,线路耐雷水平的差异以及杆塔分流系数的变化情况。仿真结果表明:在同样的接地电阻下,杆塔在有避雷线无避雷器时的分流系数要比有避雷线和避雷器时的分流系数至少大20%。另当接地电阻小于20Ω 时, 线路在无避雷线有避雷器的情况下,其耐雷水平是有避雷线无避雷器情况下的1.8~2.0倍;而线路在有避雷线和避雷器的情况下的耐雷水平是有避雷线无避雷器情况下的1.9~2.3倍。当接地电阻分别为20、15、10、5Ω 时,线路在有避雷线无避雷器的情况下的耐雷水平的提高效果不到其他2种情况的60%。研究结果对于35kV 线路的防雷保护具有一定的指导作用和参考价值。
By establishing the simulation model of 35 kV lines, the difference of lightning withstand level and the variation of shunt coefficient of towers are studied under three lightning protection cases of applying a shielding wire without lightning arresters, applying lightning arresters without shielding wires, and applying lightning arresters and a shielding wire. The simulation results show that the shunt coefficient of the tower with a shielding wire without lightning arresters is at least 20% larger than that with both lightning arresters and a shielding wire under the same grounding resistance. In addition, when the grounding resistance is less than 20 Ω, the lightning withstand level of the line having a shielding wire without lightning arresters is 1.8 to 2.0 times higher than that of the line having lightning arresters without shielding wires. The lightning withstand level of the line having lightning arresters and a shielding wire is 1.9 to 2.3 times higher than that of the line having a shielding wire without lightning arresters. When the grounding resistance is 20, 15, 10 and 5 Ω respectively, the improvement effect of lightning withstand level of the line in the condition of having shielding wire without lightning arrester is less than 60% of the other two conditions. The research results have certain guidance and reference value for the lightning protection of 35 kV transmission line.
王振羽,宋明钰,薄岩,杨廷方,苏盛.35kV线路避雷器与避雷线防雷效果量化比较分析[J].电力科学与技术学报,2021,(4):165-171. Wang Zhenyu, Song Mingyu, Bo Yan, Yang Tingfang, Su Sheng. Quantitative comparison of lightning protection effect between 35 kV line arrester and lightning line[J]. JOURNAL OF EIECTRIC POWER SCIENCE AND TECHNOLOGY,2021,(4):165-171.复制