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铁路站场中间接触网短路对附近信号电缆的影响
作者:曹晓斌 何方方   张先怡 
单位:西南交通大学 电气工程学院,四川 成都 610031
关键词:接触网支柱 短路 土壤电阻率 信号电缆 
分类号:
出版年·卷·期(页码):2017·39·第8期(45-51)
摘要:

在一些较大站场中,由于贯通地线铺设在站场两侧,中间道岔处的支柱通常只能采用单独接地。当接触网对支柱发生短路时,敷设在支柱附近的信号电缆将承受较大的过电压并可能将电缆击穿。为了研究过电压的幅值及影响因素,搭建了站场中单独接地支柱模型,并仿真分析接触网短路时,电缆上的相关电位分布情况;研究土壤电阻率等因素对电缆承受电压的影响规律,据此做出土壤电阻率等因素的安全临界值变化曲线图;由于站场条件的局限性,发现只有减少经独立支柱入地短路电流,才能达到降低电缆上承受电压的目的,以此提出了两种解决方案。结果表明两种方案均可以大幅度减少信号电缆上承受的电压,其中方案二效果更加明显,两种方案均可在铁路站场中推广运用。

In some large station yards, due to the fact that link-up grounding wire is laid in both sides of the station yard, the Overhead Contact System PoleOCS Polein the middle of station yard can only be separately grounded. When the OCS Pole is short circuited, the signal cable laid in the vicinity of OCS Pole will withstand overvoltage and may be broken down. In order to study the amplitude of overvoltage and other influence factors, the model of sepa-rately grounding OCS Pole was built, to simulate the distribution of related potential of cable when the catenary is short circuited. The influence rules of soil resistivity and other factors on   voltage withstanding of the cable were investigated, by which the graph of safety critical value changes about soil resistivity and other factors was made. Finally, because of the limitation of situation on station yard, it was found that only reducing the short circuit current conducting to the ground through the separate OCS Pole can achieve the purpose of reducing the voltage on the cable. Based on the above analysis, two solutions were proposed. The results indicate that both solutions can sharply de-crease the withstanding voltage on the signal cable and the solution No.2 shows better effect. Both   solutions can be widely used in railway station yards.

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