Study On Electromagnetic Field Insulation Characteristics Of High Temperature And Voltage Solid Heat Storage Device

With the frequent occurrence of the phenomenon of abandonment of wind in the whole country,this method of heat storage and heating by using the residual electricity generated by the discard wind has been popularized in a large area.Due to the increase of voltage level,the insulation problem of heat storage device is becoming more and more prominent.Under normal operation,the internal temperature of the heat storage device can reach about 500℃,coupled with the voltage of tens volt,a high temperature and high voltage environment has been formed in the heat storage device,especially at the beginning of the work,the internal moisture of the heat storage brick evaporates outward,and then form a high temperature and high voltage moist working condition,the internal conductor of the heat storage device is very easy to produce the phenomenon of insulation breakdown,resulting in damage to the heat storage unit.Aiming at the insulation problem of heat storage device,the following insulation optimization of the device is carried out in this paper:Firstly,the basic working principle of the heat storage device and the material selection of the internal conductor are briefly introduced.Aiming at the phenomenon that the voltage drop is too large when the heating wire arrangement is unreasonable,a new arrangement scheme is summed up,which can reduce the voltage drop between adjacent heating wire and avoid the damage of heat storage unit caused by air breakdown.Secondly,the basic heat transfer mode in the Heat storage device is analyzed,and the calculation formula of the Coke joule of the heating wire is deduced according to the basic principle of heat transfer,and then the coupling form between temperature field and electromagnetic field is explained,as well as their application in the heat storage device,the boundary conditions of these kinds of field strength in the heat storage device are analyzed.By using COMSOL Multiphysics Multi-physics simulation software,the thermoelectric coupling simulation of heat storage device with different heating wire type is carried out,and the distribution of temperature field and electric field under different wire types is obtained,and the optimization scheme is put forward according to the problem of uneven field strength distribution in the device,and verified by simulation comparison.Finally,based on the basic principle of electromagnetic field,the electromagnetic field environment of heat storage device is analyzed,the mathematical model of electromagnetic field of heat storage device is established,and the distribution of electromagnetic field is obtained by simulation analysis of COMSOL Multiphysics simulation software.Aiming at the problem of magnetic field superposition in the device,an optimization scheme is summed up,and the superiority of the scheme is verified by simulation and comparison analysis,which effectively solves the problem of magnetic field superposition between heating wire,and avoids the short circuit of the adhesion between the heating wire due to excessive magnetic field force.Finally,the reliability of the optimized heat storage device is further verified by the real-time data detected by the experimental platform of the solid heat storage system.