摘要
采用CDEGS软件建立直供带回流线供电方式和自耦变压器供电方式下牵引供电系统对架空电力贯通线感应电耦合特性的计算模型;在验证计算模型正确性和有效性的基础上,从容性、阻性和感性3种耦合方式入手,通过改变不同供电方式下牵引网与架空电力贯通线之间的平行架设长度和水平间距,分析架空电力贯通线感应电的耦合特性,并进行安全防护技术优化。结果表明:停电检修时架空电力贯通线路上的静电感应电流及电磁感应电压和电流与平行架设长度成正比、与水平间距成反比,在水平间距小于5 m或平行架设长度大于2 km时存在较大安全隐患;牵引变电所设置接地网可使其附近地电位抬升,电位梯度增大,从而导致架空电力贯通线阻性耦合电流增大;钢轨对电磁感应电压的屏蔽效果明显,且基本不受水平间距的影响;通过计算得到检修架空电力贯通线时接地封线的安全设置间距,以及不同土壤电阻率下对应的安全间距系数,为防护方案优化设计提供技术支撑。
CDEGS software was used to establish the calculation model for the coupling characteristics of the induced electricity on the overhead continuous railway power line in traction power supply system under the direct supply with return line power supply and the autotransformer power supply modes. On the basis of verifying the correctness and validity of the calculation model, starting with capacitive, resistive and inductive coupling modes, the coupling characteristics of the induced electricity of the overhead continuous railway power line were analyzed and the safety protection technology was optimized by changing the parallel erection length and horizontal spacing between the traction network and the overhead continuous railway power line under different power supply modes. Results show that the static induction current, electromagnetic induction voltage and current on the overhead continuous railway power line are proportional to the parallel erection length and inversely proportional to the horizontal spacing during interruption maintenance. There is a greater potential safety hazard when the horizontal spacing is less than 5 m or the parallel erection length is more than 2 km. The grounding grid equipped in the traction substation can raise the ground potential and increase the potential gradient nearby, which leads to an increase in the resistance coupling current of overhead continuous railway power line. The shielding effect of rail on the electromagnetic induction voltage is obvious and is basically not affected by the horizontal spacing. By calculating the safety setting distance of grounding sealing line when overhauling the overhead continuous railway power line and the corresponding safety distance coefficient under different soil resistivity, the technical support for the optimum design of protection scheme is provided.
作者
陈民武
谢崇豪
赵鑫
王颢
靳忠福
CHEN Minwu;XIE Chonghao;ZHAO Xin;WANG Hao;JIN Zhongfu(School of Electrical Engineering,Southwest Jiaotong University,Chengdu Sichuan 610031,China;Electrification Department,China Railway First Survey and Design Institute Group Co.,Ltd.,Xi an Shaanxi 710043,China)
出处
《中国铁道科学》
EI
CAS
CSCD
北大核心
2019年第6期119-125,共7页
China Railway Science
基金
四川省科技厅重点研发项目(2018FZ0107)
昆明铁路局科技计划重点课题(K17J14)
关键词
牵引供电系统
电力贯通线
耦合特性
感应电
防护技术
Traction power supply system
Continuous railway power line
Coupling characteristics
Induced electricity
Protection technology
