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.
作者
李硕
吕飞鹏
LI Shuo;LV Fei-peng(College of Electrical Engineering,Sichuan University,Chengdu 610065,China;State Grid Chengdu Power Supply Company,Chengdu 610041,China)
出处
《水电能源科学》
北大核心
2020年第12期176-179,共4页
Water Resources and Power
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
resonant grounding system
single-phase ground fault
fault line selection
sensitivity
zero sequence network
transient current
correlation analysis
