Sabalaeva N. Ground of Ways of Improvement of Commutations and Mass-sizes Descriptions of Hybrid Contactors of Low Voltage

Subject of inquiry - nonstationary electromagnetic and heat processes in power circuits of hybrid contactors; the aim of treating - improvement of switching and mass-sizes descriptions of hybrid contactors of low voltage by means of development new engineering solution; the analysis and installation - techniques of circuit theory with use of law of probability and integration of heat conduction equation in partial derivatives with use of analytical and numerical methods (Laplace transform and finite-difference method), computer program packages Mathcad, Matlab were used for working up of algorithm of calculation, experimental methods of investigation with the use of Rogovsky's welt and noninductive shunts; scientific novelty of obtained results - the techniques of calculation of thermal fields in power semiconductor devices which work in hybrid contactors take further evolution due to more detail accounting of geometry of power semiconductor devices and character of current load, defined the conditions of calculation of maximum temperature of power semiconductor devices by action of current load, the process model of transfer of current in shunting path have taken evolution, the dependence of process of reverse reactivation of power semiconductor devices by speed of current fall has accounting for the first time; practical importance of obtained results - schematic circuit of AC and DC hybrid contactors have been developed, which permit to produce the models of apparatuses which have improvement of switching and mass-sizes descriptions, design procedure of electromagnetic and heat processes in power circuits of hybrid contactors have been refined, that is permit to use the progressive methods of automated design; amount of introduction - practical recommendations, engineering solutions and design procedures are used in modernization of hybrid contactors of product lines КТ64, КТП64, КП81 in close corporation "ЭНАС" (Kharkov), in educational process in sub-faculty of electric transport in Kharkov State Academy of Municipal Economy; field of use - development of new hybrid contactors low voltage and modernization of existent product lines of this apparatuses.