Research on double-variable life forecasting based on model-building of super-path time and pick-up time for relays

The life of the relay is a major index to indicate the reliability of relay. Super-path time and pick-up time are important characteristic parameters to indicate the life of relay. During the course of open and close of relay's contact, the erosion effect of arc caused electrically damaged to contacts of relay. With the increment of contact erosion, the thickness of contact decreases, which causes super-path time shorter and pick-up time longer. Aimed at existing problems of current relay reliability life test method: (1) the method of statistic probability of sample test to estimate the electric life of relay is not so reliable; (2) the test cycle is long, and much manpower and material resource and power are wasted; (3) the test is destructive. A method of double-variable life forecasting based on model-building of super-path time and pick-up time for relays is present and the life forecasting mathematical models of trend time series and stable time series are built in this paper. The results of the experiments prove this method is valid.