Early warning of current‐carrying faults based on deterioration assessment of electric contacts

This article presents a novel early warning approach of current‐carrying faults of electric equipment based on the deterioration assessment of electric contacts. We propose to detect the temperature diversity among three phases at a certain site by employing the singular entropy analysis to the temperature sequences. Then, power spectrum density is employed to analyze the deterioration and to locate the potential faulty contacts while accomplishing the precaution task. Experimental results are presented to verify the feasibility and validity of the proposed method. © 2018 Institute of Electrical Engineers of Japan. Published by John Wiley & Sons, Inc.