Research On Transformer Vibration Isolation Structure Based On Earthquake Resistance Analysis

In the transformer in operation due to reasons such as the earthquake will lead to the transformer fails,transformer in the event of failure,will limit the generator output,and interrupt for part of the user’s power supply,prolonging transformer maintenance time,if not timely solve the problems,will be safe and reliable power supply of power grids caused great threat,and cause significant losses to the national economy.In this paper,the earthquake disasters at home and abroad over the years are collected,and the main damage realization forms of Transformers after earthquake disasters are summarized.It is found that the two kinds of damage forms,i.e.body displacement and porcelain bushing rupture,displacement and leakage,are relatively concentrated and prominent.Therefore,a vibration isolator is designed for the influence factors and hazards of earthquake on transformers,which can effectively alleviate or Reduce the damage of transformer caused by earthquake.In this paper,firstly,the vibration of transformer itself is analyzed.By establishing the mathematical equation and analyzing the deformation nephogram of transformer,it is determined that the material to eliminate the vibration and noise of transformer itself is high damping vibration isolation material.By introducing the periodic excitation of single direction,multi direction and multi direction,the forced vibration system with damping of single degree of freedom and multi degree of freedom is constructed,and the dynamic equation of single degree of freedom and the motion equation of multi degree of freedom are established.The response spectrum method is used to solve the system analytically,and then the amplitude frequency response characteristics and force transfer rate characteristics of the system are analyzed in detail.Compared with the linear vibration isolation theory,the low-frequency vibration isolation performance evaluation index of the vibration isolation system is given based on the fixed point of the transmission rate curve about the system damping ratio,and the score is further aligned with the low-frequency vibration isolation performance of the zero stiffness vibration isolation system theory Analysis and demonstration.In this paper,the research results of power flow rate prove that the isolation performance ofdouble-layer isolation system can be improved by properly reducing the mass ratio,stiffness ratio and damping ratio,and the effect of low-frequency isolation system is more obvious than that of equivalent linear isolation system.Thus,the effective scheme to enhance the vibration isolation effect of the double-layer vibration isolation system is summarized,and the form of the double-stage vibration isolator is determined.The traditional method of single-stage vibration isolator can not effectively avoid the seismic hazards.After the demonstration of this paper,the development of double stage vibration isolator is imperative.In this paper,Bilz vibration isolation pad is used as the primary vibration isolation material of the two-stage vibration isolator,which has excellent compression deformation value.The two-stage vibration isolation is designed as a damping spring structure with multi-point circular distribution.On the basis of the traditional vibration isolator,innovation has been carried out through the optimization of the use of new materials and the reasonable arrangement of the combined distribution,so as to achieve better vibration isolation effect.Finally,through the actual use and installation of the 220 kV transformer,the combined layout of the two-stage isolator is determined,and the safety of the combined layout is checked.Finally,it is concluded that the research of two-stage vibration isolator can effectively solve the damage problem of power transformer in earthquake and play a positive role in the stable operation of power system.