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我国接触网没有直击雷防护措施,耐雷水平低,架设避雷线可以有效提高接触网耐雷水平。为此,利用ATP-EMTP软件建立了雷击接触网模型,分析了保护线升高(方案1)和单独架设避雷线(方案2)这2种方案的雷电防护效果,同时研究了2种方案的支柱分流系数、避雷线分流系数以及它们之间的耦合关系,从而确定其改善接触网防雷机理。研究结果表明:方案1的耐雷水平提高约20%,方案2的耐雷水平提高约40%;支柱分流系数可达到约80%,远大于保护线和避雷线分流系数;接触网改造后,方案1支柱分流系数能够降低约2%,方案2支柱分流系数能够降低约4%,从而有效降低了支柱顶端电位;接触网改造后,方案1耦合系数能够提高约10%,而方案2耦合系数能够提高到50%以上,2种方案均降低了绝缘子两端电压,从而提高了耐雷水平。
Catenary in our country there is no direct lightning protection measures, low level of lightning-resistant, erection of lightning lines can effectively improve the level of contact network lightning. Therefore, the lightning contact network model was established by using ATP-EMTP software. The lightning protection effects of two schemes of protection line rise (Scheme 1) and separate lightning protection line (Scheme 2) were analyzed. At the same time, Pillar shunt coefficient, lightning shunt coefficient and the coupling between them, so as to determine the mechanism to improve the contact network lightning protection. The results show that the lightning-resistant level of Scheme 1 is increased by about 20%, the lightning-resistant level of Scheme 2 is increased by 40%, the branch-flow coefficient can reach about 80%, which is much larger than the shunting coefficient of protection line and lightning conductor. Pillar shunt coefficient can be reduced by about 2%, Pillar 2 shunt coefficient can be reduced by about 4%, thus effectively reducing the pillar tip potential; catenary transformation, the coupling coefficient can be increased by about 10%, while the coupling coefficient can be increased To more than 50%, both solutions reduce the voltage across the insulator, thus improving the lightning-resistant level.