Research On Vibration And Noise Reduction Methods Of Split-core Reactor Based On Magnetostrictive Effect

The split-core reactor can limit the power frequency over-voltage and improve the stability of the power system.With rapid development and wide application in recent years,it plays a very important role in power transmission system.The vibration noise generated by the long-term operation of the reactor not only affects the surrounding environment,but also shortens the service life of the equipment and reduces the reliability of the operation of the power grid.In order to find a new method that can effectively reduce the vibration noise,this dissertation selects the split-core laminated iron reactor as the research object.Considering the influence of the magnetostrictive effect of the silicon steel sheet on electromagnetic properties of the split-core reactor.The reactor prototype was subjected to numerical analysis and experimental verification of electromagnetic vibration.The research work in this thesis focuses on the following aspects:Firstly,the magnetization and magnetostriction characteristic curves of the oriented silicon steel sheet and the non-oriented silicon steel sheet in different directions were measured by the magnetic characteristic measuring device,and the actual working state of the iron core was reflected to the greatest extent.Based on the data of magnetization and magnetostrictive characteristics of electric silicon steel sheet,the magnetization and magnetostrictive characteristic curves were processed into single-valued curves by cubic spline interpolation method,which provides a data basis for later finite element calculation.Based on the magnetic characteristic measurement data of two kinds of silicon steel sheets,an iron core structure consisting of alternating oriented and non-oriented silicon steel main magnetic circuit was proposed.In order to prove the effectiveness of the method,based on the energy principle and theoretical analysis,a three-dimensional magneto-mechanical coupling model of the split-core iron reactor was established.The vibration analysis of the reactor was carried out by multi-physics numerical coupling analysis software COMSOL Multiphysics.Finally,according to the numerical calculation results,the prototype of the reactor was designed and fabricated,and the electromagnetic vibration measurement platform of the split-core reactor was built.The vibration data of the reactor prototype is sampled by the German SQuadriga_Ⅱ vibration noise measurement system.The numerical calculation data was compared with the experimental results to verify the feasibility of the vibration reduction method.The research work in this thesis has certain reference value for optimizing the core structure of split-core reactor and reducing the electromagnetic vibration noise of laminated core reactor.