500 kV变压器卡扣式套管抗震试验及刚度分析  

Seismic Test and Stiffness Analysis on Mechanical Clamped Type Bushing for 500 kV Transformer

作　　者：张郑楠 马清越 薛志航 谢强[1] ZHANG Zhengnan;MA Qingyue;XUE Zhihang;XIE Qiang(College of Civil Engineering,Tongji University,Shanghai 200092,China;State Grid Sichuan Electric Power Research Institute,Chengdu 610041,China)

机构地区：[1]同济大学土木工程学院,上海200092 [2]国网四川省电力公司电力科学研究院,成都610041

出　　处：《高压电器》2025年第4期54-62,82,共10页High Voltage Apparatus

基　　金：国家自然科学基金项目(51878508)。

摘　　要：500 kV变压器卡扣式套管在地震作用中易损性较高,易发生套管绝缘油泄漏现象。为了研究卡扣式套管法兰的抗震性能,文中采用某型号500 kV卡扣式套管节点进行3组不同加载工况的拟静力侧推试验,对卡扣式法兰节点及瓷质套管在地震作用下的破坏现象和机理进行研究,并通过顶部位移的分解和抗弯刚度公式的推导,对卡扣式法兰节点在地震作用下的刚度变化进行分析。结果表明:地震作用下卡扣式套管往复的振动会使得瓷套管根部密封圈挤压变形移位,以及出现陶瓷碎裂的破坏现象;耳板薄弱处拉应力较大,与震害破坏现象一致。结合拟静力侧推试验数据以及理论分析,修正了500 kV变压器卡扣式法兰节点抗弯刚度计算公式中的抗弯刚度经验系数。The vulnerability of the mechanical clamped type bushing for 500 kV transformer is high under seismic action and the leakage of insulating oil of bushing is likely to occur.For studying the seismic performance of the me⁃chanical clamped type bushing flange,a certain type of 500 kV mechanical clamped type bushings joint is adopted in this paper to perform quasi⁃static lateral push tests under three different loading conditions.The damage phenome⁃na and mechanisms of the mechanical clamped type flange joint and the porcelain bushings under seismic action are studied.Through the decomposition of the top displacement and the derivation of the bending stiffness formula,the stiffness variation of the mechanical clamped type flange joint under seismic action is analyzed.The results show that the reciprocating vibration of the mechanical clamped type bushing under seismic action will cause the extrusion de⁃formation and displacement of the sealing ring at the root of the porcelain bushing and the damage phenomena of ce⁃ramic fracture.The tensile stress at the weak part of the hitch lug is relatively large,which is consistent with the dam⁃age phenomenon in the seismic damage.Based on the quasi⁃static lateral push test data and theoretical analysis,the bending stiffness empirical coefficient in the bending stiffness calculation formula of the mechanical clamped type flange joint of the 500 kV transformer is corrected.

关 键 词：变压器套管 卡扣式法兰 拟静力试验 破坏现象 刚度分析 

分 类 号：TM41[电气工程—电器]