考虑牵引负荷动态特性的牵引网高阻接地保护方案  

Scheme for High Resistance Earthing of Traction Network with Consideration of Dynamic Characteristics of Traction Loads

作　　者：徐力军 XU Lijun

机构地区：[1]中铁第四勘察设计院集团有限公司电化院

出　　处：《电气化铁道》2023年第3期24-29,34,共7页Electric Railway

摘　　要：电气化铁路全并联AT供电方式牵引网发生高阻接地故障时,传统的馈线保护方案难以实现精确识别,易导致馈线保护装置拒动。为研究该问题,利用广义对称分量法分析了3种典型运行工况下牵引网的等效阻抗特性,分析了馈线保护装置拒动的原因;在此基础上,考虑牵引负荷动态特性对牵引网阻抗影响规律及其与高阻接地故障发生时的牵引网阻抗特性异同点,提出一种考虑系统负荷功率大小动态修正整定动作边界的牵引供电系统距离后备保护新方案,并将其与传统的距离保护相配合形成了一种三段式保护方案;结合仿真分析和现场实测数据验证了所提保护方案的有效性,并讨论了关键因素对保护整定边界的影响规律。When high resistance earthing fault occurs in the traction network of electrified railway with fully parallel AT power supply,the traditional feeder protection scheme is difficult to realize accurate identification,and liable to cause failure of feeder protection device.In order to study this problem,the equivalent characteristics of resistance under three types of typical operation modes are analyzed by use of generalized symmetric component method,and the causes of the failure of the feeder protection devices are analyzed as well;and on the basis of this,with consideration of the regularities affecting of resistance of traction network caused by the dynamic characteristics of the traction load as well as the similarities and differences of resistance characteristics of traction network as occurrence of high resistance earthing fault,a new distance backup protection scheme is put forward for traction power supply system that considers the dynamic correction and setting of action boundaries based on the magnitude of the system load power;and it incorporates with the traditional distance protection scheme and forms a type of three-stage protection scheme;the effectiveness of the proposed scheme has been verified by the simulation analysis and on-site tested data.The influence of key factors on the protection setting boundary has been discussed as well.

关 键 词：高阻接地 距离保护 全并联AT供电 牵引负荷动态特性 

分 类 号：U223.8[交通运输工程—道路与铁道工程]