Evaluation Of Seismic Performance Of The Isolation Structure Of 330kV Indoor Substation Under Different Level Seismic Actions

Substation is an important part of power system,it is a key link in lifeline engineering,shoulders the important task.From substation seismic damage caused by the devastating earthquake at home and abroad in recent years,the damagement of High-voltage electrical equipment is severe,paralyzing electric power system of the surrounding areas,and the secondary disaster is difficult to measure.The seismic isolation technology which use laminated rubber bearings has matured,at home and abroad,it is widely used in all kinds of civil buildings,public buildings.Some of the buildings experienced a strong earthquake test,showed superior cushioning effect.But seismic isolation technology applied in electric power building is still rare.In this paper,based on the study of the 110 kV substation building seismic isolation in the early time by this group,and the practical engineering,in 330 kV substation indoor whole isolation of related research,in order to realize the protections of the substation buildings,electrical equipment,and the structures of the building at the same time when the earthquake occurred,improve the seismic performance of substation.This paper comments the research development and application of seismic isolation technology,introduces the seismic damagement of electric power system.Relying on this substation project,analyzed the structure characteristics,put forward the principles of the selection and arrangement of the proposed isolation bearings,screening groups of the artificial and natural ground motion records according to the parameters of proposed site,input after modulation,to get the horizontal damping coefficient of the isolation substation structure,the acceleration amplification coefficient of each equipment layer,and the bearings' deformation under severe earthquake and vertical bearing capacity calculation,evaluation seismic performance of the isolation transformer substation structures under severe earthquake,according to the structural characteristics,calculate the relative displacement of isolationsections and the non-isolation sections to determine a safe distance.Take the near-fault ground motion records to consider the influence of the ground motion with pulse to the isolation transformer substation construction.In recent years,more and more phenomenon appear that the isolation technology combined with damper,is expected to achieve the complementary effect by which isolation technology reduce horizontal vibration,damper reduce vertical vibration,this paper also carried out on the vertical vibration damper design and experimental research.The results show:(1)The models used by author and the analysis are useful and can be practiced;(2)After using isolation technology,the structure's period become longer,combined with the response spectrum shows that seismic effect will be significantly smaller.(3)After entering multiple sets of earthquake records,we can see that the average of the horizontal damping coefficient is small,relative to the ground acceleration,the device layer's horizontal acceleration of non-isolated structure are generally amplified,the device layer's horizontal acceleration of isolated structure are the opposite.So the isolation technique has a significant damping effect to the upper structure.(4)In the ground motion,the rubber isolators' deformation of the four corners is consistent,the whole building was moving flat,small reverse effect.(5)Comparative analysis of plastic hinges' order of appearance and degree of development of the isolated structure and non-isolated structure,it's much better than the non-isolated structure.(6)The interlayer displacement angle under seismic action are all in line with the relevant provisions of Seismic Design Specifications.(7)By calculating the isolated substation structure's earthquake response under the action of near-fault ground motions with impulse recorded,we can see that such buildings are more sensitive to the action of near-fault ground motions,the substation structure isolated has greater earthquake damage at near-fault.(8)Aiming at reducing vertical vibrations of equipment inside the isolated substation structure,U shaped vertical dampers made of steel are designed and tested,the test proved that this component may take some energy dissipation effect.