大型变压器的汶川震害及其隔震技术研究
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摘要
针对电力系统大型变压器,对汶川地震震害进行了调研,总结了大型变压器的震害特征.并根据震害特点,提出了对大型变压器隔震的策略,设计了适合于大型变压器隔震的水平刚度小、低面压和满足竖向稳定性的铅芯橡胶隔震支座,并应用于实际750 kV大型变压器的隔震.分析结果表明,采用隔震后,750kV变压器弱轴向最大倾覆力矩减小为非隔震结构的17%,弱轴向最大剪力减小为非隔震结构的23%,变压器本体的加速度减小为未隔震的29.5%,8度罕遇地震作用下,隔震层最大位移满足支座最大容许位移的要求.
For large power transformer in electric power system,the earthquake disaster investigations in Wenchuan Earthquake are conducted and characteristics of damage of large power transformer are summarized.According to the characteristics of damage of large power transformer,the isolation technology is presented.Lead rubber bearings which have lower horizontal stiffness,lower limited pressure and vertical stability meeting requirement are designed.The lead rubber bearings are used to the actual 750 kV transformer.Analytical results show maximum overturning moment,shear force and acceleration of isolated 750 kV transformer in the direction of weak axis are decreased to 17%,23%and 29.5%of non-isolated 750 kV transformer response respectively.The maximum displacement of isolation layer is less than maximum limited displacement of rubber bearings under the intensity 8 rare earthquake.
For large power transformer in electric power system,the earthquake disaster investigations in Wenchuan Earthquake are conducted and characteristics of damage of large power transformer are summarized.According to the characteristics of damage of large power transformer,the isolation technology is presented.Lead rubber bearings which have lower horizontal stiffness,lower limited pressure and vertical stability meeting requirement are designed.The lead rubber bearings are used to the actual 750 kV transformer.Analytical results show maximum overturning moment,shear force and acceleration of isolated 750 kV transformer in the direction of weak axis are decreased to 17%,23%and 29.5%of non-isolated 750 kV transformer response respectively.The maximum displacement of isolation layer is less than maximum limited displacement of rubber bearings under the intensity 8 rare earthquake.
引文
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[2]周世平.5.12汶川大地震变压器损坏情况分析[J].湖北电力,2008,32(4):1-4.ZHOU S P.Transformer damage analysis in the 5.12 Wenchuan earthquake[J].Hubei Electr Power,2008,32(4):1-4.
[3]曹枚根,周福霖,谭平,等.变压器及套管隔震体系地震反应及隔震层参数分析[J].中国电机工程学报,2012,32(13):166-174.CAO M G,ZHOU F L,TAN P,et al.Earthquake response and isolation layer parameter effect of seismic isolation systems of transformers with bushings[J].Proceed CSEE,2012,32(13):166-174.
[4]甘艳,陈鹏云,王成智.地震灾害下变压器的损毁情况及对策研究[J].华中电力,2009.22(3):14-17.GAN Y,CHEN P Y,WANG C Z.Study on the seismic effects on the transformer[J].Mid China Electr Power,2009,22(3):14-17.
[5]刘彦辉.带有分布参数的串联体系地震响应分析及智能控制[D].兰州:兰州理工大学,2009.LIU Y H.Seismic response analysis and smart control of serial system with distributed parameters[D].Lanzhou;Lanzhou University of Technology,2009.
[6]曹枚根.大型电力变压器套管体系抗震性能及隔减震控制研究[D].广州:广州大学,2011.CAO M G.Research and application on seismic control technology for the system of large power transformer[D].Guangzhou:Guangzhou University,2011.
[7]国家电网公司科技部.汶川8.0级地震电网受灾情况调研及初步分析报告[R].2008,6.Department of Science and Technology of State Grid.Investigation of power network damage and preliminary report in Wencuan 8.0 degree earthquake[R].2008,6.
[8]于永清,李光范,李鹏,等.四川电网汶川地震电力设施受灾调研分析[J].电网技术,2008,32(11):1-6.YU Y Q,LI G F,LI P,et al.Investigation and analysis of electric equipment damage in Sichuan power grid caused by Wenchuan earthquake[J].Power Sys Tech,2008,32(11):1-6.
[9]张子引,赵彪,曹伟炜,等.四川汶川8.0级地震电网受灾情况调研与初步分析[J].电力技术经济,2008,20(4):1-4.ZHANG Z Y,ZHAO B,CAO W W,et al.Investigation and preliminary analysis of damages on the power grid in Wenchuan earthquake of M 8.0[J].Electr Power Tech Econ,2008,20(4):1-4.
[10]四川省电力试验研究院.汶川大地震四川电网电气设备受损情况调研分析报告[R].2009,3.Sichuan Provincial Electric Power Test Research Institute.Report of investigation and analysis of damages for electric equipments on Sichuan power network in Wenchuan earthquake[R].2009,3.
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