Review of Characteristic Parameter Extraction and State Evaluation Methods for AC Contactors

As a prevalent electrical on - off apparatus, the AC contactor is extensively applied in power supply and distribution systems. Consequently, conducting an assessment of its operating state is of great significance, as it contributes to ensuring the reliable operation of power supply and distribution systems. This paper comprehensively reviews the extraction of characteristic parameters and the means of condition assessment for AC contactors. From the perspective of classifying condition assessment methods into physical models and data driven models, this paper summarizes the research advancements in recent years. Relevant technologies are generalized to enhance the reliability of AC contactors in the future, and the future development trends are also outlined.