Theoretical Study of Electrical Contact Dustiness Impact on Transition Resistance

摘要

Electronic equipment widely uses low-voltage electrical contacts. Errors and failures in such contacts basically occur due to dust contact surfaces, the formation of films, changes in the pressing force of the contacts, etc. The development of mathematical models of the electrical contacts allow us to determine the main parameters of the switching elements taking into account possible contamination and to develop methods of prevention of failures. This article discusses the mathematical model used to determine the resistance of the transition zone of the electrical contacts. The proposed model takes into account elastic, elastoplastic and plastic deformation of Microsystem rough surface contacts, the presence of surface films and dust particles on them. The obtained theoretical dependence of the probability of failure of the electrical contacts on the concentration of dust particles. The failure of probation was fixed at an increase of the transition resistance of the transition zone twice.