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RESEARCH PAPER
Predicting Remaining Useful Life of AC Contactors Based on a Novel Doubly Truncated Degradation Model Considering Arcing Mode Transitions
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Kui Li 1
 
 
 
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1
Hebei University of Technology, China
 
 
Submission date: 2026-02-11
 
 
Final revision date: 2026-03-21
 
 
Acceptance date: 2026-03-31
 
 
Online publication date: 2026-04-25
 
 
Corresponding author
Shihu Xiang   

Hebei University of Technology, China
 
 
 
KEYWORDS
TOPICS
ABSTRACT
Accurate remaining useful life (RUL) prediction of AC contactors is essential for efficient operation and maintenance of the manufacturing system. Existing methods cannot adequately capture the degradation of AC contactors due to their inability to depict the special characteristic of zero and bounded arcing Joule integrals (i.e., degradation increments). To tackle this problem, the physical model of arcing Joule integrals is first derived through arcing mechanism analysis. Bounds of arcing Joule integrals are obtained by introducing critical breaking phase angles to the physical model, and four arcing modes are identified. A method for measuring the similarity between arcing modes is proposed, and then an arcing mode similarity based discrete-time Markov chain is constructed to depict arcing mode transitions. Motivated by zero and bounded arcing Joule integrals, an increment process with zero and bounded increments is proposed to characterize the degradation of a single-phase contact pair. Finally, the superiority of the proposed method is illustrated by real and numerical cases.
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