基于相位比较与固有频率的混合线路故障测距  

Fault Location of Hybrid Line Transmission Based on Phase Comparison and Natural Frequency

作　　者：张媛媛 陈金辉 王茜[1,2] 刘学琴 ZHANG Yuan-yuan;CHEN Jin-hui;WANG Qian;LIU Xue-qin(Skills Training Center of State Grid Jibei Electric Power Company Limited,Baoding 071000 China;Baoding Technical College of Electric Power,Baoding 071000 China)

机构地区：[1]国网冀北电力有限公司技能培训中心,河北保定071000 [2]保定电力职业技术学院,河北保定071000

出　　处：《自动化技术与应用》2023年第3期36-39,共4页Techniques of Automation and Applications

摘　　要：多测点相位比较法原理简单易实现,但无法进行故障距离的计算;固有频率法不受波头检测和同步时钟的限制,但测距精度会随故障距离的增大而降低。考虑二者的特点,提出基于相位比较与固有频率的混合线路故障测距方法。首先应用相位比较法确定故障区间;利用锁定故障区间的相邻两测点频域信息,提取行波固有频率主成分;最后应用频域信息完成故障测距。仿真表明,该方法可以准确的判定出故障区间,具有较高的测距精度和较强的适应性。The principle of the multi-measurement phase comparison method is simple and easy to implement,but it is not possible to calculate the fault distance.The natural frequency method is not limited by the wave head detection and synchronous clock,but the accuracy of the ranging decreases with the increase of the fault distance.Considering the characteristics of the two methods,a combined distance measurement method for T-type transmission lines based on phase comparison and natural frequency is proposed.First,the phase comparison method is used to determine the fault interval;the frequency domain information of the two adjacent measurement points in the locked fault interval is used to extract the main component of the traveling wave natural frequency;finally,the fault distance can be calculated corresponding the frequency domain.The simulation results show that the combined method can accurately determine the fault interval,and has higher ranging accuracy and stronger adaptability.

关 键 词：故障测距 相位比较 固有频率 混合线路 

分 类 号：TP277[自动化与计算机技术—检测技术与自动化装置]