基于S变换特征频率序列的小电流接地系统故障区段定位方法  

A novel fault section location method for small current neutral grounding system based on characteristic frequency sequence of S-transform

作　　者：王晓卫[1] 田书[1] 李玉东[1] 李涛[1] 张玉均[1] 李青 

机构地区：[1]河南理工大学电气工程与自动化学院,河南焦作454000 [2]河南省商丘市商丘供电局,河南商丘476632

出　　处：《电力系统保护与控制》2012年第14期109-115,共7页Power System Protection and Control

基　　金：河南省教育厅科学技术研究重点项目(12B470002);河南省控制工程重点学科开放实验室资助项目(KG2011-15);河南理工大学青年基金(Q2012-28);已申请国家发明专利(申请号:201210112373.9)

摘　　要：提出了一种基于特征频率序列经多重组合方式判定的小电流接地系统单相接地故障区段定位方法。该方法对一条馈线上各检测点的暂态零模电流纯故障分量经S变换,以暂态能量最大时对应的频率点为基准,选取出特征频率序列。将一整条馈线作为系统,求取出任意相邻两检测点的暂态零模电流能量相对熵值。采用多重组合方式对求取的的熵值进行比较,待所有组合方式比较完毕后,将出现次数最多的'可能故障区段'判定为故障区段。采用相对熵值衡量波形的差异性,特征效果明显;运用多重组合方式进行判定,可提高定位结果的可信度。We propose a novel fault section location method based on characteristic frequency sequence determined by multiple combinations for small current neutral grounding system. We transform the transient zero-mode current components of every detection point through S-transform for a whole line, and utilize the frequency point corresponding to the maximum of transient energy as reference to select the characteristic frequency sequence. Then we consider the whole line as a system, and calculate the relative entropy values of any two adjacent detection points for transient zero-mode current. Finally, we adopt the multiple combinations to compare the relative entropy values calculated, when all of the combination ways are compared, we determine that the possible fault section with high frequency is the fault section. The method of adopting the relative entropy values to measure the difference of waveforms shows an obvious characteristic effect, and using multiple combinations to judge can improve the reliability of location results.

关 键 词：故障定位 S变换 特征频率序列 多重组合 相对熵 

分 类 号：TM862[电气工程—高电压与绝缘技术]