一种基于故障模型的补偿电网接地综合选线装置  

The grounding line selection device of compensation grid based on grounded fault model

作　　者：陈忠仁[1] 朱明军[2] 黄健[1] 何业军[1] Chen Zhongren;Zhu Mingjun;Huang Jian;He Yejun(School of Electrical Engineering,Zhongshan Polytechnic,Zhongshan,Guangdong 528404;Xinyang Electric Power Company,Xinyang,He'nan 464000)

机构地区：[1]中山职业技术学院机电工程学院,广东中山528404 [2]信阳供电公司检修公司,河南信阳464000

出　　处：《电气技术》2019年第1期42-48,共7页Electrical Engineering

基　　金：广东省省级科技计划项目(2016A010102005)

摘　　要：由于消弧线圈的接入,补偿电网改变了电网的电气特征量的性质,给利用电气特征量进行接地选线带来了诸多困难,且较高的过渡电阻对选线的结果也有较大影响。为解决上述问题,本文研制了一种基于接地故障模型的小电流接地综合选线装置。首先建立了接地故障的数学模型,根据数学模型识别出瞬时性接地故障、高阻接地故障和低阻接地故障。瞬时性接地故障时选线进行闭锁。根据高阻接地故障的特点,优选出零序电流有功分量法和零序电流增量法,这两种选线方法受过渡电阻的影响比较小。在此基础上,构成接地综合选线装置。仿真实验和低压模拟实验验证了这两种方法的有效性,达到了满意的选线结果。The electrical characteristic of compensation grid is changed because of the arc-suppression coil,which brings many difficulties to grounding line selection using the electrical characteristic.And the higher transition resistance has a great influence on result of grounding line selection.To solve the above problems,a small current grounding line selection device is developed based on grounded fault model.First,a mathematical model of grounded fault is established.Transient ground fault,high resistance grounding fault and low resistance grounding fault are identified according to the mathematical models.Line selection device should be locked up when transient grounded fault.According to the characteristics of the high resistance grounding fault,the zero sequence current active component method and its increment method are adopted.The two line selection methods are less affected by the transition resistance.On this basis,a composite grounding line selection device is constituted.Matlab simulation and low-voltage experiments verify the effectiveness of the two methods and achieve satisfactory results of line selection.

关 键 词：接地故障 模型 补偿电网 接地综合选线 装置 

分 类 号：TM862[电气工程—高电压与绝缘技术]