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地铁高架区段耐雷水平的研究对于地铁防雷措施的选取具有重要意义。为此,建立了地铁高架接触网耐雷水平模型,讨论了接地电阻、高架桥高度对耐雷水平的影响,重点分析了避雷线架设和避雷器安装位置对高架桥线路耐雷水平影响规律。研究结果表明:桥墩接地电阻变化对耐雷水平影响不超过0.5 k A;有高架桥与无高架桥相比,有高架桥时避雷线处的过电压为无高架时的8倍左右;架设避雷线对每个支柱所对应的绝缘子的耐雷水平提高幅度不同,离桥墩近的支柱,耐雷水平提高2倍以上;雷击避雷线时,安装避雷器时线路耐雷水平提高1倍以上,雷击接触线时耐雷水平提高2倍以上,但会引起间隔支柱绝缘子击穿。
Research on the level of lightning-proof in metro elevated section is of great significance for the selection of metro lightning protection measures. For this reason, the subway overhead mine network lightning tolerance level model was established. The influence of grounding resistance and viaduct height on the mine-resistant level was discussed. The influence of lightning conductor installation location and arrester installation location on the mine-resistant level of viaduct line was analyzed emphatically. The results show that the change of the grounding resistance of the bridge pier has no effect on the lightning-resistant level by more than 0.5 kA. Compared with the viaduct without viaduct, the overvoltage at the lightning conductor with the viaduct is about 8 times of that without the viaduct. When the lightning arrester is installed on the lightning arrester, the lightning proofing level of the arrester is increased by more than 1 time and that of the lightning arrester is increased by 2 times when the lightning arrester contacts the lightning arrester Above, but will cause breakdown of pillar insulators.