Temperature Rise And Optimal Design Of Dry Hollow Reactor Based On ANSYS

In recent years,as the scale of the power grid continues to grow and the fluctuation of the power grid becomes more and more volatile,the design and manufacturing level of reactors has also become higher and higher.In particular,the development of dry hollow reactor is so rapid that its manufacturing standard and level have also been greatly improved.The effective reduction of local temperature rise is of great significance to the operating efficiency,operating life and the whole power industry of dry hollow reactors.In order to improve the calculation accuracy of temperature rise of dry hollow reactor,this paper not only designs and simulates the distribution of two-dimensional field strength of reactor from the basic principle of electromagnetic field,but also gives the calculation method of magnetic field distribution of reactor and derives the calculation expression of loss of reactor.On this basis,the thermal effect of the eddy current loss of the terminal arm and the influence of the bracing strip on the temperature rise are considered,and the existing dry hollow reactor is studied and the structure is improved.In order to reduce the influence of eddy current loss,the center ring bushing of the terminal arm is eliminated and the structure is replaced by direct welding of the terminal arm shaft end;in order to improve the heat dissipation performance of the envelope air channel,the spacer bar between the envelope is eliminated.To ensure that the experimental results are accurate enough,a three-dimensional finite element model is established in ANSYS to analyze the temperature rise of the dry hollow reactor using the resistance loss,eddy current loss and eddy current loss in the winding of the reactor and the upper and lower terminal arms as the basic heat source.By comparing the temperature rise pattern with and without the spacer bar and the center ring bushing of the wiring arm,it was verified that the structure-optimized reactor is more conducive to heat dissipation,improving the operating performance and significantly reducing the local temperature rise from the root.In order to ensure the stability of the overall mechanical structure of the reactor,mechanical simulations of the envelope and terminal arm were carried out in ANSYS,and the overall reactor was subjected to externally applied withstand voltage test and lightning shock test.The winding overvoltage simulation was carried out on the basis of the lightning shock test,and it was concluded that the voltage at each envelope node of the reactor increases from the innermost layer to the outermost layer,and the more the outer envelope is,the smaller the difference of the instantaneous voltage of the coil at different positions of each layer.Finally,it is concluded that the overall mechanical strength of the dry hollow reactor meets the requirements after structural optimization.