Dynamic Study and Stress Analysis of Mechanical Spring Drive(MSD) in Circuit Breaker

Abstract

The need of electrical energy without interruption is becoming more and more im- portant. To meet this requirement, the demand on reliability of each individual component is increasing. The circuit-breaker constitutes the last link in the chain of the protection equipment for a power supply system. The dynamic analysis of drive mechanism, Enable industries to save cost and re- duce time that spend on doing mechanical testing of actual prototype of mechanism. Due to the wide range of physical principles involved in high voltage circuit-breakers, di erent numeric tools have been employed to simulate and understand mechanics, hydrodynamics and electrical behaviour. In power transmission or distribution net- work, circuit breaker provide automatic protection in response to abnormal load conditions. The circuit breaker may therefore be called upon to perform a number of di erent operations such as interruption of terminal faults or short line faults, interruption of small inductive currents, interruption of capacitive currents, out-of- phase switching or no-load switching. In circuit breaker, actual opening and closing operation is carried out by two con- tacts: Fixed Contact and Moving Contact The moving contact is operated by drive mechanism, where linkage system connects the drive mechanism to the moving contact. In this work initially mathematical model for four bar mechanism is simulated in ADAMS. The results of software is compared and validated by analytical calculations. Further, Various analytical solutions are obtained for di erent components of MSDx1 Drive (Mechanical Spring Drive). An assembly is prepared and its dynamic properties are modelled in MSC ADAMS R3 (Automatic Dynamic Analysis of Mechanical Sys- tem) for dynamic analysis. Results are obtained by running simulation in ADAMS.