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针对现有的规程法、电磁暂态仿真程序等对耐雷水平的计算过程中都尚未考虑线路运行时工频电压的影响,为了准确评估接触网受雷击后的影响,根据接触网雷击过电压的产生途径,将其分为3种类型,分别建立等值电路,然后结合规程法,推导了计及工频电压后接触网耐雷水平的计算公式,并利用该公式计算了常见高速铁路接触网的耐雷水平,最后分析了工频电压对接触网耐雷水平的影响。结果表明:接触网耐雷水平是关于工频电压的函数,随工频电压的变化而变化,在接触网防雷设计中,需以耐雷水平的最小值为评估依据。
In order to accurately evaluate the influence of lightning strike upon the contact network, the influence of lightning frequency on line operation has not been taken into account in the existing procedures and electromagnetic transient simulation programs. Therefore, according to the overvoltage Which is divided into three types, respectively, to establish the equivalent circuit, and then combined with the rules of law, derive the calculation formula of the lightning-resistant level of the contact network after the power frequency voltage, and use the formula to calculate the common high-speed railway contact network Lightning-resistant level, the final analysis of the power frequency voltage on the level of contact with the mine-resistant impact. The results show that the lightning protection level of the contact network is a function of power frequency voltage and varies with the change of power frequency voltage. In the lightning protection design of the contact network, the minimum lightning protection level should be used as the assessment basis.