Feature fragment and wavelet packet combined cable fault feature extraction method and device

• Main Authors: WANG PEILUN, WANG YISHUANG, JIANG LIANGGANG, YIN XIUHONG, LIU YUMING, LYU TENGFEI, KIM KIL JIN, LIU QIANQIAN
• Format: Patent
• Language: Chinese; English
• Published: 05.04.2024
• Subjects: CALCULATING; COMPUTING; COUNTING; ELECTRIC DIGITAL DATA PROCESSING; MEASURING; MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES; PHYSICS; TESTING

The invention provides a cable fault feature extraction method and device combining feature fragments and wavelet packets, and belongs to the technical field of power cable fault detection. According to the method, a cable fault signal is segmented, and then wavelet packet decomposition is used for decomposing each segment of fault signal on the basis of wavelet decomposition, so that high-frequency fault information in a cable fault mode is obtained. The zero-sequence current amplitude and the positive-sequence voltage phase of a cable fault signal serve as an original fault mode, fragmentation processing is carried out on the original fault mode, wavelet packet decomposition is carried out on each fragment to obtain a wavelet packet coefficient, weighted summation is carried out on the wavelet packet coefficients of different fragments, and then different weights are given to the fragments to obtain new fault features. And judging whether a classification result is accurate or not by utilizing a Fisher crit