摘要
为了评估某型1 100 kV特高压(UHV)变压器瓷套管的抗震性能及其可能存在的抗震薄弱位置,对该套管进行了地震模拟振动台试验,获得了套管的动力特性及在不同地震动输入工况下的地震响应。试验结果表明,特高压套管自振频率较低,阻尼比小,其自身对地震动有较大的放大作用。在目标峰值人工波激励下,套管铸铝法兰下部连接套筒底板发生破坏,出现沿法兰加劲肋分布的裂缝且发生漏油,其破坏现象与汶川灾害中出现的套管破坏特征一致。发生破坏后,套管基频降低,阻尼比升高。对其破坏现象进行了分析,明确了该型套管的破坏原因。该型特高压变压器套管抗震设计薄弱位置位于其铸铝法兰与加劲肋连接处,应对此处结构进行优化以提高套管抗震性能。
In order to evaluate the seismic performance and weakness of ultra-high voltage（UHV） bushing,shaking table tests were carried out on a 1 100 kV UHV transformer porcelain bushing under different input ground motions.The dynamic property and seismic responses of the bushing were measured.The results indicate that the natural frequencies of the bushing are low and the damping ratios are small,while the dynamic amplification effects are obvious.Under the input ground motion of the synthetic time history,the bottom plate of the cast aluminum flange cracks along its stiffeners and oil leakage happens.The failure phenomenon is in accordence with the transformer bushing flanges in Wenchuan Earthquake.After the failure,the fundamental frequency decreases and the damping ratio of the bushing increases.Moreover,the reason for the failure is analyzed and the weakness of the bushing is found to be the flange connection between the bottom plate and stiffeners.Some countermeasures are suggested to improve the seismic performances of the bushing.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2017年第10期3154-3162,共9页
High Voltage Engineering
基金
国家电网公司科技项目(SGTYHT/14–JS–188)
教育部霍英东教育基金会优选资助课题(114021)~~
关键词
特高压变压器瓷套管
振动台试验
抗震性能
法兰
破坏机理
UHV transformer porcelain bushing
shaking table test
seismic performance
flange
failure mechanism
