基于高低频段零序电流与母线零序电压导数的相关分析故障选线  

Fault Line Selection with Correlation Analysis of Zero Sequence Current under High-Low Frequency and Voltage Derivative

作　　者：李硕 吕飞鹏[1] LI Shuo;LV Fei-peng(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Chengdu Power Supply Company,Chengdu 610041,China)

机构地区：[1]四川大学电气工程学院,四川成都610065 [2]国网成都供电公司,四川成都610041

出　　处：《水电能源科学》2020年第12期176-179,共4页Water Resources and Power

摘　　要：针对谐振接地系统发生单相接地故障后的选线准确度问题,尤其是故障发生在相电压过零点及最大值附近时灵敏度欠缺的问题,首先分析零序网络故障暂态电流的特性,探讨健全线路与故障线路的阻抗特性,然后将零序电流和电压导数的相关系数作为判据,充分地利用了馈线暂态零序电流中的衰减直流分量、工频分量和高频分量,提出一种高、低频段下的相关分析故障选线方法,最后从故障合闸角、过渡电阻两方面仿真验证了所提方法的有效性。To solve the resonance grounding system problem that fault line selection is not enough sensitive when a single-phase ground fault occurs near the zero or maximum point,after analyzing the transient current and line impedance characteristics of zero sequence network,and making full use of the decaying DC component,power frequency component and high frequency component of the transient zero sequence current of the feeder,a fault line selection method based on correlation analysis of zero sequence current and bus zero sequence voltage derivative in high and low frequency band is proposed.The effectiveness of the method is verified by the examples from the aspects of fault closing angle,transition resistance.

关 键 词：谐振接地系统 单相接地故障 故障选线 灵敏度 零序网络 暂态电流 相关分析 

分 类 号：TM862[电气工程—高电压与绝缘技术]