高铁综合接地系统接地效果验证与评价

Validation and Evaluation of Grounding Effect on Integrated Grounding System of High-Speed Railway

摘要:

对高铁综合接地系统的接地效果进行准确评价可为综合接地系统的设计施工及运营维护提供依据；在牵引供电系统实际组成结构的基础上,采用传输线模型,考虑保护线(PW线)和钢轨互感对分流系数及贯通地线接地阻抗的影响,推导得到符合综合接地系统实际情况的分流系数及接地阻抗的表达式；选用分流系数及接地阻抗作为衡量接地效果的评价指标,通过与遂渝线实测数据的验证对比表明,所提指标对路基段及桥梁段都有较好的评价结果；尤其对路基段的评价,能更好地与实测数据印证,减少了评价误差。

Abstract:

To evaluate the grounding effect on integrated grounding system(IGS) of high-speed railway accurately can provide the basis for the IGS’s design, construction , operation and maintenance. The transmission method is used in this paper based on actual structure of the traction power supply system. Shunting coefficient and integrated grounding wire’s(IGW) impedance are deduced considering the effect of protection wire(PW) and mutual inductance between rail and IGW respectively. Shunting coefficient and IGW’s impedance are used as assessment indices. A comparison between the theoretical result and measurement result on Suining-Chongqing railway shows that the method could get a good assessment result when it is used to evaluate the grounding effectiveness of IGS in roadbed section and bridge section. Especially in roadbed section, the grounding impedance’s theoretical result and measurement result are the same and the method reduces evaluation’s error.