电网单相断线故障类型及电压特征  

Types and Voltage Characteristics of Single-Phase Line Breaking Faults in Power Grid

作　　者：李斌 曾子琪 潘轩 LI Bin;ZENG Ziqi;PAN Xuan(Loudi Power Supply Company of State Grid Hunan Electric Power Co.,Ltd.,Loudi 417000,China)

机构地区：[1]国网湖南省电力有限公司娄底供电公司,湖南娄底417000

出　　处：《安徽电气工程职业技术学院学报》2024年第1期59-68,共10页Journal of Anhui Electrical Engineering Professional Technique College

摘　　要：断线故障包括断线不接地、断线电源端接地、断线负荷端接地等。而断线故障类型、位置、系统中性点接地方式等均会影响系统电压幅值和相位等电气量特征。为挖掘各种断线故障在不同情景下的电压特征,系统地归纳和总结了单相断线故障类型,分析了不同断线故障下中性点可能的移动范围及断线后断口两端电压变化特征,运用对称分量法推导了110 kV断线时,负荷侧35 kV、10 kV母线电压特征,对断线故障定位、电网故障判别与处置具有现实意义。Line breaking faults include broken line ungrounding,broken line power side grounding,broken line load side grounding,etc.The type,location and neutral grounding mode will affect the voltage amplitude and phase of the system.In order to explore the voltage characteristics of various line breaking faults in different situations,this paper systematically summarizes the types of single-phase line breaking faults,analyzes the possible moving range of neutral points of different line breaking faults and the voltage variation characteristics of both ends of the break after line breaking.The symmetric component method is applied to deduce the voltage characteristics when 110 kV line breaking occurs,with 35 kV on the load side and 10 kV on busbars,which is of practical significance for locating,discriminating and dealing with the power grid fault.

关 键 词：单相断线 中性点偏移 断线接地 电压不平衡 故障判别 

分 类 号：TM773[电气工程—电力系统及自动化]