AT供电方式下直接供电分支接触网的故障测距方案  

Fault Location Scheme of Direct Feeding Branch Overhead Contact Lines in Auto-transformer Feeding System

作　　者：洪彬 林国松[1] 吴泽方 杜欧洋 朱志龙 HONG Bin;LIN Guosong;WU Zefang;DU Ouyang;ZHU Zhilong(Southwest Jiaotong University,Chengdu 610031,China;China Railway Guangzhou Group Co.,Ltd.,Guangzhou 518001,China)

机构地区：[1]西南交通大学,成都610031 [2]中国铁路广州局集团有限公司,广州518001

出　　处：《高速铁路技术》2023年第5期23-28,99,共7页High Speed Railway Technology

基　　金：四川省自然科学基金项目(2022NSFSC0405)。

摘　　要：在我国电气化铁路的AT供电方式中,直接供电分支线路在供电区段内进行“T”接。然而,当这些分支直供线路发生故障时,既有AT测距系统无法识别故障区段并精确定位。通过分析AT供电方式带直接供电分支线路的电路模型,发生T-R短路故障时的电流分布、吸上电流比特征以及在牵引变电所测量的短路阻抗,提出一种吸上电流比法和电抗法的综合方案,实现了AT供电方式下直接供电分支接触网的故障测距。该方案通过数值仿真验证了其可行性和准确性,并以某高速铁路线路的历史故障报告验证了基于分支点电流比识别故障支线方法的合理性。For China’s electrified railways,there is a situation that the traction network of auto-transformer feeding system forks into the direct feeding branch line in the power supply section with a“T”junction.When the branch direct feeding line fails,the existing auto-transformer ranging system cannot identify the faulty section and accurately locate it.By analyzing the circuit model of auto-transformer feeding system with direct feeding branch line,current distribution when T-R short circuit fault occurs,characteristics of boosting current ratio and short circuit impedance measured in traction substations,this paper proposes a comprehensive method to realize fault location of direct feeding branch overhead contact lines under auto-transformer feeding system by using boosting current ratio method and reactance method.Numerical simulation was used to verify the feasibility and accuracy of this scheme.The historical fault report of a high-speed railway line verifies the rationality of the method for identifying faulty branch lines based on the current ratio at branch points.

关 键 词：分支接触网 AT供电 故障测距 吸上电流比法 电抗法 

分 类 号：U223.512[交通运输工程—道路与铁道工程]