| The electrical equipment of the substation has the characteristics of high,heavy and flexible,and has high vulnerability under the action of earthquake.Pillar electrical equipment such as isolating switches and transformers have the characteristics of high center of gravity,and their main structures usually include lower brackets and upper porcelain insulator pillars.The material porcelain has poor energy dissipation and deformation capacity,and low ultimate strength,and is prone to root fracture damage in high-intensity earthquakes.The natural vibration frequency of pillar-type electrical equipment is distributed in 1～10Hz,usually around 2Hz,which is close to the excellent frequency of seismic waves,and is prone to resonance damage under the action of earthquakes.Based on the above engineering background,this paper takes the GW7B-252 disconnector as the research object,conducts in-depth research on its seismic performance,and on this basis,conducts research on the vibration reduction and isolation control method,and finally takes the soft bus coupling disconnector as an example to verify the The reliability of the seismic isolation method,and the formula and curve of the vertical-span ratio of the soft busbar and the stress peak value at the root of the porcelain bottle are given.The specific research work of this paper is as follows:（1）The isolating switch entity model was established by the ABAQUS finite element analysis software,and the time history response analysis and calculation of the isolating switch under different seismic waves and different peak acceleration inputs were carried out under seven working conditions.In case of an earthquake,the porcelain bottle may be broken,and the natural vibration frequency of the isolation switch is 2.1696 Hz,which has a great risk of resonance damage.（2）Based on the results obtained from the time-history response analysis of the isolating switch,a ring damper was installed on the top of the upper porcelain bottle,the flange connection,and the root of the lower porcelain bottle respectively,and the time-history response analysis was carried out.When the damper is installed at the root,the acceleration,displacement and stress shock absorption rate are the largest,and the shock absorption effect is the best,and the shock absorption rate is 12.41%～16.14%.（3）On the basis of the isolation switch’s shock absorption,the isolation support is installed on its base,and the laminated lead-core rubber support and the sliding friction pendulum support are respectively installed,and the time-history response analysis is carried out.The research shows that the displacement of the top of the base will be enlarged after the seismic isolation bearing is installed,and the magnification ratio of the laminated lead-core rubber bearing is the smallest.The acceleration peaks are obviously reduced,and the average value of the maximum reduction is 60.43%.The stress distribution of the isolating switch is only reduced by the use of the laminated lead-core rubber bearing alone,and the average seismic isolation is 45.93%,while other working conditions are slightly amplified.（4）Establish the model of the soft busbar coupling isolation switch and current transformer.The vertical span ratio of the soft busbar is selected from 13% to 28%.The isolation switch adopts damper for shock absorption and laminated lead-core rubber bearing for shock isolation.method and time-history response analysis.The analysis results show that the seismic stress of the coupling model will be amplified to a certain extent.The minimum value of the stress amplification characteristic is 20.74% and the maximum value is 99.34%.In practical engineering,sufficient safety margin should be reserved. |
