变压器及套管隔震体系地震反应及隔震层参数分析

国内外震害表明,变压器在地震中的破坏型式多样,易损性极高。隔震技术是一项能够有效降低地震反应的新型抗震技术,而变压器及套管隔震层的设计和参数选择与普通结构有较大的差异。首先,建立了大型电力变压器及套管隔震体系的多质点分析模型,采用Matlab软件编写计算程序,分别输入人工地震波和Taft地震波,对变压器及套管隔震体系的地震响应进行分析;最后,开展了隔震层等效水平刚度、等效阻尼比、双线性恢复力模型的屈服剪力系数及屈服后刚度等参数的地震响应影响分析。分析结果表明:合理设计变压器及套管隔震体系的隔震层参数,可有效降低变压器及套管的地震响应;另外,通过隔震层的参数分析,得到了相关参数的合理取值范围。该研究对今后变压器及套管隔震体系的设计具有参考与指导作用。

Earthquake Response and Isolation Layer Parameter Effect of Seismic Isolation Systems of Transformers With Bushings

Seismic damage data and experience in power transformers at home and abroad indicate that transformers will have various forms of destruction and expose high vulnerability during the earthquake.Seismic isolation is a new technology which can effectively reduce seismic response for structure.But there is a large difference between the seismic isolation system of transformers with bushings(SISTB) and the system with general structure in terms of isolation layer design and parameters selection.Firstly,a multi-mass analysis model of SISTB was established and the calculation program was compiled with Matlab software.Then,by inputting artificial and Taft seismic wave,earthquake responses of SISTB were analyzed.Lastly,seismic response effect analysis was carried out with respect to parameters of the isolation layer such as equivalent level stiffness,equivalent damp ratio,yield-shearing force coefficient and yield stiffness.The research shows that the seismic isolation technology is very effective to reduce seismic response of transformers and bushings as long as isolation layer parameters of SISTB are rationally defined.In addition,the rational range of parameters of the isolation layer of SISTB was acquired.In conclusion,researches mentioned above play a reference and guidance role in seismic isolation design for power transformers and bushings in the future.