Dynamic control by contact tisk in powered electric contacts with use shape memory alloys

Abstract

Collapsible contact joints are the most numerous elements of electrical installations. The 

efficiency of the contacts, their reliability to a large extent depends on the modes of electric current and temperature, contact pressure, etc. Modification of modes and operation time lead to an increase in the resistance of the contacts, the temperature of their heating and possible thermal destruction. Traditional means for controlling the pressure in the contacts when changing the temperature regime are steel plate springs. Previous investigations have established that these means only partially solve the problem of regulation of contact pressure. An alternative to traditional means is the innovative development of dynamic pressure control tools based on the use of functional alloys with the shape memory effect.
The mathematical analysis of terms of carrying out repair works and service life of collision type contacts with the use of probability theory in the conditions of incompleteness of the initial information is carried out. The research substantiates that the use of dynamic method of control of the thermomechanical regime of collapsible contacts allows to stabilize pressure and extend the life of collapsible contacts by 3-4 times.