Development Of Hydraulic Operating Devices LW-252 SF6 Circuit Breaker & Calculation And Analysis Of Dynamic Behavior

Soon after its advent in circuit breaker at the beginning of 1960s, hydraulic operating mechanism drew great attention from countries all over the world.By adopting a totally new working principle, hydraulic operating mechanism has the advantages of less part number, higher reliability, convey power stable. On the basis of successful development of hydraulic operating mechanism this paper lays emphasis on the study of the deep-seated correlative theories, aiming at providing theoretical guidance for the design and optimization of hydraulic operating mechanism.In the first of the paper, based on the introduction of hydraulic operating mechanism development history and application at home and abroad, the development vista of Hydraulic operating mechanism is analyzed. Chapter 2 to 6 constitute the main part of the paper - choose and design of structure. It is the pure problems being designed for hydraulic operating mechanism that is discussed both in aspects of action time and velocity characteristics.The calculation methods adapted from fluid mechanics and dynamics are applied on calculating dynamic time property in hydraulic operating mechanism, which is popular at present.There are no more descriptions to the arithmetic itself, because it is enough to use in engineering.It is the dynamic time property that is figured out so as to provides parameters for engineering design lately, compared with actual value, and analyzed the factors of influencing pilot valve.Meanwhile it is also a theoretical basis of adjusting pilot valve during the period of sample test.The paper formulates the dynamic analyses of hydraulic operating mechanism in large space, established mathematical model, presents methods of differential equation system, and corrects its parameters concerned in process of solution.After the unloaded characteristics calculation and test under real condition are developed for type LW-252 breaker equipped with hydraulic operating mechanism, the time-displacement cures and the velocity-displacement cures are obtained. Calculation results are in correspondence with testing results.In addition, this paper calculates safe valve device fixed on the hydraulic operating mechanism, it is satisfied with requirements on all kinds of running conditions and the safety problem-in the hydraulic operating mechanism, made or designed in China, is worked out in this paper. Not only does it open accurately at the valueln advance but close when it returns.