Research On High-Speed Repulsion Driver And Fast Monitoring Apparatus Of Fault Current

In recent years, a new sort of fast actuator which is manufactured using eddy current principle is introduced. Because of its characteristic that can drive load to move within a short time, it has aroused great concern in the field of fast switch research. Meanwhile, besides the fast equipment to deal with the faults in the power system fast monitoring apparatus is also required. Both high-speed repulsion driver and fast monitoring apparatus of fault current are studied in this paper.In order to realize the application of repulsion driver on the high-voltage switch, the purpose of this paper is how to make the repulsion driver to drive heavy load on the basis of guaranteeing high-speed movements. Finite element analysis software ANSYS is applied to build the model of the repulsion driver and analyze the factors which influence the velocity of the repulsion driver (including the thickness, radius, resistivity of the metal plate, the fill factor, turns, resistivity, radius, thickness of the coil, the distance between the metal plates and the coil, magnetic circuit, additional resistance, the capacity and the voltage of capacitance etc.), and find out the fundamental laws that how these factors influence the repulsion force and its function time. Meanwhile, command codes are programmed by using APDL (ANSYS Parametric Design Language) to optimize the repulsion driver and analyze its dynamic process, and then some best design parameters are found out. And a prototype is made according to the former analysis and many experiments are done to prove the analysis results. Finally, many performance experiments are taken to both repulsion driver and permanent magnetic actuator which has the same functions as a comparison and the results show the design of the repulsion driver achieves satisfactory result.The monitoring apparatus of fault current used in DC system is designed (High-speed digital process chip as its core). In this apparatus, the front passage adopts high-linearity analog optic-couplers and high-speed processing circuit (optic-coupler as its core), and then effectively realizes the real-time signal acquisition and isolation from the strong electricity. The specialty digital processing chip TMS320LF2407 and concise fault current algorithms are taken to shorten the processing time further. Using a simple data selector makes the switchover between manual control and automatic control more convenient. A new LED display driver MAX6951 is adopted to efficiently realize the human-computer interaction. Finally, the monitoring apparatus is tested by experiments and obtains good performance.