Test And Simulation Analysis On 3D Dynamic Characteristics Of High-voltage DC Relay

As a kind of bridge type direct-acting dual-breakers control electrical device with high-power processing capacity,the high-voltage DC relay is widely used in the fields of new energy vehicles and power supply equipment,photovoltaic and wind power generation system and so on.If there are some problems about the structure design and assembly,the situation of contact and arcing imbalance of the dual-breakers electrical apparatus will occur.In the actual operation process,the relay contact system does not show a single-direction movement,but there will be some deviation in other directions in three-dimensional space,which will increase the wear of the contact system,thus reduce the service life of the relay even make it invalid.Due to operating under the high-voltage and heavy current condition,it has important significance to improve the reliability and service life of high-voltage DC relay by studying the electromagnetic structure and contact system comprehensively.Therefore,this paper combines the three-dimensional dynamic testing technology with virtual prototype technology to test and analyze the dynamic characteristics of the contact system of high-voltage DC relay,then carries out the analysis for the spring system and entire model by the three-dimensional simulation method.It will provide an important theoretical guideline for the design,quality control of production and assemble of the high-voltage DC relay.A three-dimensional dynamic characteristic testing platform which based on virtual binocular vision principle is designed in this paper.The testing platform consists of image acquisition system,plane mirror,illumination system and fixing device.The precision of the testing system has been verified and the influence factor has been analyzed.By this platform,the bridge type dual-breakers contact system of high-voltage DC relay is tested under the different exciting voltage and three-dimensional reconstruction is conducted,then the three-dimensional dynamic characteristic curve is created and analyzed.After importing the three-dimensional reconstruction data into the Adams Multibody Dynamics software,the visualization of the three-dimensional movement process could be realized.By means of finite element method(FEM),the paper builds the simulation model of spring system and carries on the theoretical research and simulation analysis for the spring system's movement mechanism during the electrical apparatus action.Meanwhile,it verifies the spring simulation model by the spring tension and compression testing machine.By the control variable method,this paper conducts simulation on the springs with different structural parameters and researches the influence structural parameters on the mechanical properties of spring,which lays the foundation for improving the performance of the product.Using the coupling method of electricity,magnetism and force,the paper builds electromagnetic mechanism and entire machine simulation model of the high-voltage DC relay with Maxwell and Adams to simulate and analyze the three-dimensional dynamic characteristic of the contact system,which provide a new method for the electrical virtual prototype three-dimensional simulation.On this basis,according to the influence of effective coil number on mechanical properties of the spring,the contact spring is designed.Thus the stability of the three-dimensional movement of the contact is improved under ensuring reasonable cooperation of suction and reaction force.It has an important significance of promoting production performance and service life.