Optimization Of Filler Density Process Parameters For High Voltage Fuse

High-voltage fuse is a kind of circuit protection device with high breaking performance in power grid system,which can effectively guarantee the safe operation of power grid.In the structure of high-voltage fuse,the insulating quartz sand filler which can meet the requirements of compactness can play the role of arc extinguishing,heat transfer and explosion-proof,so the dense filling process of quartz sand filler is very important for the performance assurance of high-voltage fuse.At present,the compact filling technology of the small-sized packing tube fuse has been very mature.However,due to the large ratio of length to diameter of cartridge,the filling process and parameter control are more complex,which makes the existing filling process difficult to apply to high-voltage fuse.At present,the filling of quartz sand filler for high-voltage fuse adopts the manual knocking operation.The filler density of each product is not high,the difference is large and the production efficiency is low.In order to improve the finished product quality and efficiency of high-voltage fuse products and the level of filling automation,this paper explores a filling process of horizontal radial impact rotating cartridge.Based on the discrete element method,the vibration compactness effect of quartz sand column is simulated by EDEM software.Based on the Love shell theory,the dynamic model of cartridge under radial impact is established,and the law of packing density and the optimization of process parameters are analyzed through several experiments.Through simulation and experiment,it is found that the vibration mode of the cartridge under radial impact is the combination of the first-order circumferential mode and the first-order axial mode.In order to better observe the movement of quartz sand and its related laws under the radial impact rotating cartridge process,transparent acrylic tube is used in the experimental exploration.The comparative analysis of the amplitude of the cartridge and acrylic tube shows that the vibration laws of the two materials are similar,and the acrylic tube can be used to replace the cartridge for experimental exploration.The results show that the density of each part along the axial direction decreases gradually from the maximum at the impact point to both ends.At the same time,the accumulation effect of quartz sand in the pipe is not significant,which can ensure the uniform distribution of quartz sand particles with different sizes.In the range of reasonable parameters preliminarily explored,through the filling test of 50mm outer diameter tube by orthogonal test,the process parameters of the best densification effect are obtained,impact frequency is 2.8Hz,impact position is L/3,cartridge speed is 55s/r,impact time is 180s.Fill the cartridge under this process parameter,the compactness can reach 1.65g/cm~3 in 18s,and the compactness limit can reach 1.689g/cm~3 in 220s.It is proved that this process can make the average compactness of the filler reach the basic requirement of 1.65g/cm~3,and has higher production efficiency.Through the vibration mode analysis of the cartridge,the simulation analysis of the quartz sand filler and the experimental exploration of the compactness law,the compactness law of the quartz sand filler and the process parameters of effectively increasing the compactness of the high-voltage fuse filler are obtained.The research conclusion can improve the dense filling process of quartz sand filler of high-voltage fuse,and has practical guiding effect on the production of high-voltage fuse.