Damage Assessment Studies And Sesmic Performance Of Typical Indoor Substation Main Plant

Power system is one of the pillar industries of national economy, the substation as an important part of power system, it plays a role of changing voltage grade and the pivotal role of distribution power, its damage will cause the whole power system can not run normally, so the seismic performance of the study on the main transformer substation building and earthquake damage assessment has very important significance.This paper, according to the national science foundation project “Considering the interaction among the main factory building structure and electrical equipment of large transformer substation seismic performance research(No.51008246)”,Established the prototype shaking table test model of finite element model. Through the results of the experiment and finite element analysis found:under the action of the earthquake, with the increase of input seismic peak acceleration, main substation building peak acceleration and displacement of every floor increases with the increase of structure of floor, and the top floor is the structure’s weak floor. The peak acceleration response of equipment main body and the casing is greater than the input peak acceleration value and the second floor’s peak acceleration value, this embodies the interaction of structure and equipment, the equipment casing’s peak acceleration value is greater than the device body’s peak acceleration value. Trials found that column’s damage is worse than beam’s, the short to the side span beam’s edge, the angle coloum’s bottom and top of second floor and top floor has relatively severe damage, electrical equipment under the framework of beam found no obvious damage. In addition, by comparing the two experimental prototype M1, M2 found that the main factory building structure’s vibration period value of consider the interaction is greater than the vibration period value that does not consider the interaction, and with the increase of modal order number, vibration period of main building corresponding vibration mode increase rate is smaller and smaller.analyzed the finite element numerical simulation results and experimental results, verified the correctness of the test process and results.Put forward the comprehensive consideration of shaking table test and finite element analysis of displacement correction coefficient method, the method using the floor displacement obtained from the test to correct the interlayer displacement from finite element model, and use the revised interlayer displacement to calculate the stiffness degradation of substation’severy floor,obtain the floor’s damage assessment result, then use the result to get the whole structure’s damage assessment result by using the weighted combination method, the result is match with experimental, show the effectiveness of the method. Finally, calculated the damage distribution coefficient of various components and the weighted coefficient of component’s layer damage value to floor damage value and component’s whole damage value to structure damage value,the weighted coefficients can be used to assess the indoor type substation main building’s damage.