摘要
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。
It is necessary to research the lightning protection performance of contact network of subway elevated bridge section to obtain lightning protection measures. We established a lightning withstanding level model of subway elevated bridge, by which the impacts of grounding resistance and elevated bridge height on lightning protection performance were discussed. The rule of lightning protection performance on ground wire erection and lightning arrester location was also analyzed. The results show that the range of influence of pillar grounding resistance on the lightning withstanding level is less than 0.5 kA. Meanwhile, the overvoltage of subway elevated bridge section is about 8 times as much as that of gener- al subway when lightning strikes a ground wire; the magnitude of lightning protection performance is increased by different levels in the insulators of each pillar after erecting ground wires, i.e. the lightning withstanding level is increased by more than two times on the nearest pillar, Moreover, the lightning withstanding level is more than doubled by installing lightning arresters when the ground wire gets struck by lightning, and when the contact network is struck by lightning, it is increased by over two times though the spacing insulators will be breakdown.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2015年第11期3611-3617,共7页
High Voltage Engineering
基金
中央高校基本科研业务费专项资金资助(2682014CX022)~~
关键词
城市地铁
高架桥
耐雷水平
接地电阻
避雷线
避雷器
urban subway
elevated bridge
lightning protection performance
grounding resistance
ground wire
lighming arrester
