基于小波变换的短路故障早期检测门限值的研究  

Research on Threshold of Early Prediction for Short Circuit Fault Based on Wavelet Transform

作　　者：陈丽安[1] 张培铭[1] 

机构地区：[1]福州大学电气工程与自动化学院

出　　处：《电工技术学报》2005年第3期64-69,共6页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(50007004)。

摘　　要：当采用小波分解方法对低压配电系统短路故障进行早期检测时,门限值的合理设置对故障检测的可靠性及灵敏度是至关重要的。本文通过对低压配电系统电动机的起动、过载及线路短路的暂态过程进行深入研究,得到了基于三次 B 样条小波变换的短路故障早期检测门限值的设置方法。该方法与全波傅里叶模值检测方法相比,不仅可将短路故障与电动机起动、过载正确区分开,而且还可超高速地检测出短路故障。仿真结果证实了该方法的正确性及有效性。The proper setting of threshold is crucial for the early prediction of the short circuit fault in the low-voltage distributed system when using the method of wavelet decomposition. The approach of threshold setting for the short circuit fault early detection based on quadratic B spline wavelet has been discussed in this paper by researching on the transient process of motor starting, overload and short circuit faults in low-voltage system. Compared with the Full-wave Fourier Module method, this approach can distinguish the different types of fault and detect the fault quickly. The validity of this method has been verified by simulating results.

关 键 词：小波变换 短路故障 早期检测 门限值 

分 类 号：TM711[电气工程—电力系统及自动化]