摘要
在分析矿井交流杂散电流产生机理的基础上,以某矿井交流供电系统为研究对象,结合交流杂散电流可能流通的路径,搭建了矿井交流杂散电流模型,并采用Matlab/Simulink软件进行仿真分析,研究了高低压电缆绝缘电阻在不同不平衡系数下交流杂散电流的分布规律。研究结果表明:当高压或低压电缆绝缘电阻发生不对称后,因其产生的交流杂散电流主要分布在绝缘电阻不对称区间内的屏蔽层/地线芯、金属网等结构上;当整条电缆绝缘电阻不对称时,交流杂散电流在返回电网的回流路径中不断增大;随着电缆绝缘电阻不平衡系数的增大,流经屏蔽层/地线芯、金属网及各接地极的交流杂散电流有效值均增大。
Taking AC power supply system of a mine as research object and combining possible circulation path of AC stray current,a mine AC stray current model was built based on analysis of generation mechanism of mine AC stray current.Distribution laws of AC stray current under different unbalance coefficient of insulation resistance of high voltage or low voltage cable were researched by Matlab/Simulink simulation.The research results show that when insulation resistance of high voltage or low voltage cable is asymmetry,the generated AC stray current mainly distributes in shielding or ground wire and metal net in asymmetry section of insulation resistance.When insulation resistance of the entire cable is asymmetric,AC stray current increases continuously in return path to power grid.With the increase of unbalance coefficient of insulation resistance,effective value of AC stray current flowing through shielding or ground wire,metal net and each ground electrode all increases.
作者
张敏
武兴华
耿蒲龙
宋建成
牛宏辉
田德翔
ZHANG Min;WU Xinghua;GENG Pulong;SONG Jiancheng;NIU Honghui;TIAN Dexiang(National&Provincial Joint Engineering Laboratory of Mining Intelligent Electrical Apparatus Technology,Taiyuan University of Technology,Taiyuan 030024,China;Shanxi Key Laboratory of Mining Electrical Equipment and Intelligent Control,Taiyuan University of Technology,Taiyuan 030024,China)
出处
《工矿自动化》
北大核心
2019年第2期65-69,共5页
Journal Of Mine Automation
基金
国家自然科学基金资助项目(U1510112)
山西省青年科技研究基金资助项目(201701D221240)
关键词
矿井交流供电系统
矿井供电电缆
交流杂散电流
绝缘电阻不对称
绝缘电阻不平衡系数
mine AC power supply system
mine power cable
AC stray current
insulation resistance asymmetry
unbalance coefficient of insulation resistance
