Study On Seismic Performance Of Large Transformer Substation Main Power House System With Equipment-structure Interaction

The transformer substation is an important part in the power system, it is the pivotto change voltage class, bring together the distribution of electrical energy, provides animportant guarantee for the rapid and steady development of the national economy.Substation system is prone to be damaged subjecting a strong earthquake, causingdamage to the main plant structure or partial collapse, and electrical equipment, whichled to the paralysis of the entire power system. Currently, study on seismic performanceof large transformer substation main power house system without equipment-structureinteraction at home and abroad has achieved some results, but study on seismicperformance of large transformer substation main power house system withequipment-structure interaction still in its infancy, many issues waits for furtherstudying.According to eight kinds of different levels of indoor substations of State GridCorporation of China Typical Design of Power Transmission and Distribution Projectand electrical equipment produced by Xi’an High Voltage Switchgear Factory, thisarticle establishes a three-dimensional finite element model of large transformersubstation main power house system with equipment-structure interaction. Forcomparative analysis, a three-dimensional finite element model of large transformersubstation main power house system without equipment-structure interaction is alsoestablished. After model analysis, we obtain the law of dynamic characteristics of thesubstation main plant, and study the impact of electrical equipment in different floors onnatural period of vibration of the main plant system, the analysis result shows that thenatural period of vibration of main power house system with equipment-structureinteraction is higher than the main power house system without equipment-structure interaction, and the former shows equipment-based local vibration after the third-stagemode of vibration. The study also found that when electrical equipment at higher floors,its impact on the vibration period is higher, and when in lower floors, its impact issmaller.We conduct seismic response analysis for eight kinds of substation plant systemwith equipment-structure interaction by the time history analysis method, and weobtained changing regulations of structure capitals acceleration, top acceleration ofelectrical equipment, capitals displacement, interstory drift, basic structural shear ofseismic force. The results show that under frequent earthquakes, the seismic responsesof main power house system with equipment-structure interaction and main powerhouse system without equipment-structure interaction differ little, while under rareearthquakes, the seismic response of the former is much stronger than the latter.According to the analysis results of acceleration and displacement of the main plantsystem, this article also improved the acceleration dynamical magnification factor andinterstory drift of substation plant system.Based on the actual engineering, this article also conducted elastic-plastic timehistory response analysis under earthquakes of8or higher magnitudes for main powerhouse system with equipment-structure interaction and main power house systemwithout equipment-structure interaction, and obtain the differences in both yield orderand plastic hinges chang. The study shows that many beams and columns of mainpower house system with equipment-structure interaction and main power house systemwithout equipment-structure interaction were under the elastic stage, but there wereserious damage about beams and colunmns at the end of gable walls. In addition, therewere many different of yield order and plastic hinges chang on some position betweenmain power house system with equipment-structure interaction and main power housesystem without equipment-structure interaction, there were many beams plastic hingehad yield at the equipment floor of the main power house system withequipment-structure interaction, but all beams plstic hinge were keep elastic stage at thesame position of main power house system without equipment-structure interaction.