ELASTIC EQUIVALENT SPRING FOR THE ELECTROMECHANICAL CIRCUIT BREAKERS DRIVEN BY ELECTROMAGNETS
Journal Title: ANALELE UNIVERSITATII DIN CRAIOVA - Seria Inginerie electrica - Year 2011, Vol 35, Issue 35
Abstract
The aim of the present paper is to analyze the transient phase of electromagnetic actuators mechanisms of the electrical switching device by two different analytical methods, in order to simplify the determination of the electromechanical parameters of the mobile assembly of the electromechanical circuit breaker by an approximation method named the "method of the equivalent spring". The paper discusses the mathematical modeling of electromagnetic switching devices such as low voltage contactors, breakers or switches devices, considered electromechanical energy conversion systems with two degrees of freedom, one electric and another mechanical, which are valid for Lagrange equations of analytical mechanics. The value of the parameters on connecting regime can be determined by one or more mathematical systems of differential equations that characterize the transitional electromechanical regime of the direct current electrical switching device. Equivalent spring method has been developed starting from the equations that characterize the electromechanical mechanism of the electrical switching device, on the basis of energy conservation and the approximation of the mechanical work developed by the electromagnetic actuation with magnetic energy variation between the beginning and the end of transient phase for the connecting regime. The innovative solution allows to analyze the behavior of the electrical switching device easily than the other methods. It presents this advantage due to the fact that it is necessary only a system of equations, and therefore does not require a compounding of equations systems.
Authors and Affiliations
Eugen HNATIUC, Marius URSACHE, Radu BURLICA
Keywords
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