Abstract: Electrical contact reliability is an important aspect of contactor electric products reliability, so assessment of electrical contact performance and reliability and prediction its failure time to improve operational reliability of contactor electrical apparatus products have important application value. Aiming at the complexity of the relay failure reasons, prediction of electrical contact reliability is put forward based on gray theory. By establishing of a single variable prediction model GM(1,1), preferable forecasting the electrical contact failure problems. And HH52P type electromagnetic relays failure detection test is done using dynamic contact resistance measurement system, it proves the accuracy of the grey prediction models.

Key words: Calamity prediction model, Electrical contact, Gray theory, Grey prediction model, Relay