结合小波包变换和5次谐波法的谐振接地系统综合故障选线方法  

Comprehensive Fault Line Selection Method for Resonant Grounded System Combining Wavelet Packet Transform with Fifth Harmonic Method

作　　者：刘渝根[1] 王建南[1] 马晋佩 骆仁意 

机构地区：[1]重庆大学输配电装备及系统安全与新技术国家重点实验室,重庆400030

出　　处：《高电压技术》2015年第5期1519-1525,共7页High Voltage Engineering

基　　金：国家创新研究群体基金(51021005)~~

摘　　要：为了提高谐振接地系统单相接地故障选线的可靠性和准确性,提出了一种充分利用故障暂态信息的选线方法,综合考虑了故障线路与非故障线路零序暂态电流小波包分解系数的极性关系和模值关系,定义并计算了各条线路的故障特征值。在各特征频带相同时,可通过比较各线路的故障特征值直接得到选线结果;特征频带不一致时,结合5次谐波法和小波分析自适应地进行故障选线。随机设定了20种单相接地故障,并应用该选线算法进行选线,选线准确率达100%。说明该选线方法不受故障点位置、接地点过渡电阻和故障时刻的影响,具有很高的可靠性和准确度,且在有多回线-缆混合馈线的情况下,具有较高的选线效率。In order to improve the reliability and accuracy of fault line selection for single-phase earth fault in resonant grounded system, we put forward a comprehensive fault line selection method, which takes the transient information of ground fault into consideration. Taking into account the polar and modulus values of wavelet packet decomposition coef- ficients of zero-sequence current of fault line and health lines, we defined and calculated the fault characteristic value of each line firstly, and got the selection results directly by comparing these values if each line has the same characteristic frequency band. When such bands were different, it could select the fault line adaptively by combining fifth harmonic method with wavelet analysis. Moreover, we set 20 kinds of single-phase earth fault randomly and then selected the fault line with proposed method. Surprisingly, the selection accuracy rate has reached 100%. The results show that the pro- posed method has a high accuracy and reliability and is not affected by fault location, transitional resistor, and initial fault angle. Furthermore, it has a higher efficiency in selecting fault line when the network has many hybrid feeders.

关 键 词：谐振接地系统 故障选线 小波包 5次谐波法 特征频带 故障特征值 

分 类 号：TM862[电气工程—高电压与绝缘技术]