Characteristics Of Ehv Circuit Breakers Hydraulic Actuator

High voltage circuit breaker is an important equipment in electric network playing control and security role. The operating capability of high voltage circuit breaker is largely determined by hydraulic operating mechanism, as its driver. For the Mechanical failure of hydraulic operating mechanism of high voltage circuit breaker especially of super high voltage circuit breaker caused in designing and producing, designing and optimizing new hydraulic operating mechanism with higher capability and reliability is an important direction in the area of high voltage circuit breaker research.Researching a hydraulic operating mechanism of 550kv high voltage circuit breaker, the thesis theoretically researched the Characteristics of whole system, cushion component and pipeline, analyzed the capability changes effected by structure and environment changing, given some optimization, and created a customized simulation tool, with using the theoretics of Hydrodynamics and Hydraulic drive and many simulation software. The thesis also designed a characteristics test rig of high voltage circuit breaker hydraulic operating mechanism and did experimental study.The whole thesis consists of several sections as follows:Chapter 1: This chapter gives the historical review on progress of high voltage circuit breaker and its hydraulic operating mechanism, and current development of hydraulic operating mechanism.Chapter 2: This chapter theoretically analyzed the Characteristics of hydraulic operating mechanism and its changes effected by structure and environment changing. A customized simulation model is also created.Chapter 3: This chapter theoretically analyzed the pressure and flow characteristic of cushion structure of hydraulic operating mechanism, with separating the flow process in the cushion structure and using differential equation and CFD tool.Chapter 4: This chapter theoretically analyzed the pipeline effect of hydraulic operating mechanism.Chapter 4: This chapter introduced the hydraulic operating mechanism Characteristics testing device and process of testing.