Seismic Performance Study On Porcelain Bushing Installed On The High Voltage Reactor Electrical Equipment In The UHV Substation

UHV power transmission project is a key measure to solve the uneven distribution of energy and environmental pollution in our country,and provide clean energy for China's economic development.It plays a key role in the field of electric energy distribution function;and its safe operation is related to the national economy and the people's livelihood.High voltage shunt reactor is important electrical equipment in substation and the main failure modes for the reactor are ontology dumping and displacement,or the high pressure casing occur fracture and dislocation.Aft the Tangshan earthquake,we have been taken reinforcement measures for the high voltage reactor equipment in our country's earthquake area,equipment damage has been reduced.But the porcelain bushings above the equipment ontology seriously damaged under strong earthquake.In this paper,combining with the characteristics of the structure of high voltage electrical equipment,according to the theoretical analysis,numerical simulation analysis and shaking table test were adopted,we completed the four important research contents:(1)Dynamic characteristics and seismic response study for high resistance body-bushing system in UHV substation.We set up the numerical simulation model of high resistance body-bushing system and study the equipment characteristics rule of porcelain bushing including formation,frequency distribution,and mass distribution,and study on structural measures to reduce casing seismic response.(2)Similarity model design research for high resistance body-bushing system.This paper investigates the similarity model design of high resistance body-bushing system based on similarity theory.A test scheme is established based on numerical simulation analysis.The scheme is easy to conduct on a shaking table and the gravity effects can be neglected.(3)Isolation technology research of high resistance body-bushing system.Establish high resistance body-bushing system similar model which ignore the influence of gravity and conduct isolation design analysis.Theoretical analysis is used to determine the isolation device parameters.Seismic response of high resistance body-bushing system added isolation device is obtained according to the numerical simulation.The calculation results show that isolation effect is remarkable.(4)Shake table test research of high resistance body-bushing system. According to shake table test of high resistance body-bushing system similar model,we study that seismic response rules of reactor casing under the seismic action and verify the effectiveness of the isolation design scheme.Test results and simulation results show that,for the aseismic structure,simulation results are consistent with shaking table test results,which indicates that simulation can reveal the seismic response of reactor bushing under an earthquake.Using vibration isolation,the maximum strain of reactor bushing reduces significantly.The isolation efficiency can reach more than 50%if the earthquake is relatively strong.