Investigation of naturally aged timing relays' service life by employing thermally accelerated aging

This paper presents a study on naturally aged timing relays. This study employs thermally accelerated aging method. This method includes various inspection, surveillance and monitoring (ISM) tests to identify and characterize the process of material and component degradation during the service which leads to the estimation of service life for the target relays. After applying the aforementioned tests, several observations are made and the results are provided. Also, some recommendations are made at the end to improve the thermally accelerated aging analysis in the future.