地铁杂散电流引起上海电网变压器偏磁研究  

Study on Transformer Magnetic Bias Caused by Metro Stray Current in Shanghai Power Grid

作　　者：陈璐 伍俊伶 黄华 王泽忠[2] 吴天逸 苏磊 CHEN Lu;WU Jun-ling;HUANG Hua;WANG Ze-zhong;WU Tian-yi;SU Lei(State Grid Shanghai Municipal Electric Power Company,Shanghai 200120,China;School of Electrical and Electronic Engineering,North China Electric Power University,Beijing 102206,China)

机构地区：[1]国网上海市电力公司,上海200120 [2]华北电力大学电气与电子工程学院,北京102206

出　　处：《变压器》2023年第3期16-22,共7页Transformer

基　　金：国家电网有限公司科技项目(520940200013)。

摘　　要：地铁杂散电流造成变压器偏磁的驱动电流源具有复杂、影响因素多等特点。为了认识地铁杂散电流对上海电网变压器偏磁的影响,利用建立的大地模型计算了杂散电流地电位的影响范围,并根据计算结果,选点对上海220kV电网13台变压器和500kV电网7台变压器中性点电流开展了观测实验,利用大量的实测数据研究地铁列车运行工况、变压器运行方式等因素对变压器偏磁电流量值水平和波动性的影响。研究的结果表明,地铁杂散电流对上海城网220kV和500kV变压器的严重影响范围在地铁线路沿线的3km范围内,不能用直流接地极的变压器偏磁评价标准评估地铁杂散电流的偏磁影响。The metro stray current is the driving current source of transformer magnetic bias. Its characteristics are complex and have many influencing factors. In order to understand the influence of stray current on DC magnetic bias of transformers in Shanghai power grid, the influence range of stray current ground potential is calculated by using the established earth model. According to the calculation results,the current of 13 transformers in Shanghai 220kV power grid and 7 transformers in 500kV power grid at the neutral points were observed. Using a large number of measured data, the effects of train operating conditions, transformer operating modes and multiple subway lines on the transformer bias magnetic current value and its fluctuation were studied. The results show that the serious impact range of subway stray current on 220kV and 500kV transformers in Shanghai urban power grid is within 3km along the subway line. And the influence of transformer magnetic bias of metro stray current can not be evaluated by the standard of transformer magnetic bias of DC grounding pole.

关 键 词：地铁杂散电流 城市电网 变压器偏磁 杂散电流地电位 偏磁测量 

分 类 号：TM401.2[电气工程—电器]