Fault Diagnosis System in Rectifier Units Based on Wavelet Packet and Fuzzy Diagnosis

According to the cophase counter parallel connection rectifier units widely used in electrochemical and the metallurgical industry,the paper analyzes the different kinds of faults and the particularity of the fault diagnosis of the rectifier units.With the experiment,this paper studies a fault diagnosis algorithm by using the valve side phase current of the rectifier transformers.The paper proposes wavelet packet-fuzzy recognition method of realization fault diagnosis.This method is verified by experiments,and the accuracy of the fault diagnosis is excellent.