Seismic Wind Resistance Properties And Mechanical Properties Of Ultrahigh Pressure GIS Research

Because of GIS cover an area of an area small and the advantages of wide and popularrange of application, has been widely used in various cities, has become an indispensablepart of life in the engineering line. And with the increase of voltage grade of GIS hasincreased in size and height, resist the ability of environmental load relativelysubdued.Previously for seismic research of power equipment needle against the traditionalopen switch equipment, mostly related to seismic code and there is no written rules ofultrahigh GIS, thus improve the mechanical properties of ultrahigh GIS under theenvironment of large load become a necessary task.Based on the800kV GIS machinery for research object, by earthquake and wind theenvironment factors as the external load, through the theory of modal analysis, the vibrationcharacteristics of the GIS, and USES the theory of seismic response spectrum analysis of theGIS ground motion response of the structure under seismic load.In accordance with the highvoltage switch equipment and control equipment of seismic requirements(GB/T13540-2009), with the damping ratio of2%under the conditions of the seismic levelAG5RRS standard spectrum of input seismic load, according to the results of the800kVGIS natural vibration frequency is low, and the earthquake energy frequency band, thereforethe GIS resonance occur more easily in the process of earthquake; Through seismic spectrumanalysis can be obtained under the AG5seismic fortification levels, the bracket of GIS hascan’t meet the safety standards of the GIS; With800kV GIS part structure as the researchobject, through this part of the GIS structure seismic time history analysis, maximum stressoccurred in same place, and more than the yield strength of material, also can’t meet therequirements of the safety of the GIS, and the structure of the casing stress distributionwithin the scope of its material security. Through the whole structure of GIS and GIS partstructure of spectrum analysis, is a complete GIS spectrum analysis to calculate themaximum stress value of the GIS part structure stress value is large, the structure of theequipment related to each other. After the time history analysis is most a kind of in the timedomain sequence validation method, verified the calculation results and the consistency ofthe spectral analysis results. And by the time history analysis peak acceleration the samesituation, different main frequency seismic waveform have bigger influence on the structure, nearly doubling the structural stress value.With800kV GIS outdoors part as the research object, in the wind load by studying thecharacteristics of busbar tube between the two stents and external wind load of fluctuatingwind vortex frequency, busbar tube is put forward under the wind load is the best length toavoid resonance and insulator spacing. By using the method of wind vibration coefficient ofoutdoor parts equivalent static analysis, choose as far as possible when the object of study tothe surrounding interconnected devices into consideration, to increase the reliability of thecalculation results. It is concluded that the GIS in an average of10minutes maximum windspeed41.9m/s the biggest stress under the condition of72.7MPa, has great safety margin.