配网绝缘渐损接地增量电流波形及选线定位分析  

Incremental current waveform analysis and line-selection fault-location method forintermittent breakdown grounding in distribution network

作　　者：周奕轩 皮杰 宋天宝 邹运 杨丽丽 骆德昌[3] ZHOU Yixuan;PI Jie;SONG Tianbao;ZOU Yun;YANG Lili;LUO Dechang(Automation Engineering,Shanghai University of Electric Power,Shanghai 200090,China;School of Electrical and Power Engineering,China University of Mining and Technology,Xuzhou 221116,China;School of Electrical and Power Engineering,Wuhan University,Wuhan 518052,China)

机构地区：[1]上海电力大学自动化工程学院,上海200090 [2]中国矿业大学电气与动力工程学院,江苏徐州221116 [3]武汉大学电气与自动化学院,湖北武汉430072

出　　处：《电力科学与技术学报》2020年第4期58-65,共8页Journal of Electric Power Science And Technology

基　　金：上海市电站自动化技术重点实验室资助(13DZ2273800);国家级大学生创新训练计划资助(201610290026);江苏省研究生科研与实践创新计划项目(SJCX17_0527)。

摘　　要：为提高配网包括绝缘渐损接地在内的单相接地选线定位的可靠性,仿真观察绝缘渐损接地在不同阶段的电流波形。首先,根据这些电流波形及发展变化的共有规律,选择接地相的次暂态锯齿波增量电流和健全相与之对应时刻的增量电流作为配网绝缘渐损接地自举选线定位的判据信号源,分析锯齿波电流反映所有接地电流的通用性特点,并研究设计锯齿波标量和矢量相位差的计算方法;然后,仿真研究并比较包括锯齿波在内的单相接地电流与操作性、诱发性扰动电流的波形特征,为辨识真伪单相接地找寻判别基准,并以此为依据,研究设计包括绝缘渐损在内的配网单相接地防误辨识和选线定位方法;最后,采用所制作的接地定位器在低压配网模型的合环运行线路上验证所设计方法的正确性。In order to improve the reliability of line-selection and fault-location for single-phase grounding failures in distribution network,the current waveform at different stages were studied and stimulated.Firstly,in terms of the summarized common features of current waveforms during their development,the incremental current of the sub-transient sawtooth wave in the grounding phase and the incremental current in the sound phase are selected as the criterion signal sources for the fault location of the insulation loss in distribution networks.The general characteristics of all grounding currents reflected by the saw tooth currents are analyzed.Then,the difference of waveform characteristics is analyzed between single-phase grounding current and operation-induced disturbance currents.It provides a criterion for identifying the authenticity of single-phase grounding failure.The line selection and location method are proposed for the single-phase grounding including the insulation loss to avoid misidentification.Finally,the proposed method is applied to the grounding locator in a low voltage distribution network model for verification.

关 键 词：配网 绝缘渐损接地 锯齿波 镰刀波 相地增量电流 选线定位 

分 类 号：TH411[机械工程—机械制造及自动化]