220 kV氧化锌避雷器地震易损性分析
Seismic fragility analysis of a 220 kV zinc oxide arrester
洪志湖 1邹德旭 1朱龙昌 1代维菊 1闵青云 1严敬义 1孙灏若 1赵熙靖 2朱登杰 3谭向鹏3
作者信息
- 1. 云南电网有限责任公司电力科学研究院,云南 昆明 650217
- 2. 云南电网有限责任公司普洱供电局,云南 普洱 665000
- 3. 南方电网科学研究院有限责任公司,广东 广州 510000
- 折叠
摘要
变电站中的避雷器在地震中易受破坏,对其进行抗震评估分析是必不可少的.为研究220 kV避雷器的抗震性能和地震易损性,建立了 220 kV氧化锌避雷器-支架体系的精细化有限元模型.基于数值模拟,首先,对其进行地震响应分析,研究了避雷器的地震响应特点和抗震能力;其次,对避雷器进行了在地震动、电气设备结构和认知等多重不确定性下的地震易损性分析;最后,建立概率地震需求模型拟合得出避雷器的失效概率与地震峰值加速度的关系曲线,即易损性曲线.结果表明:在 9 度设防地震作用下,220 kV氧化锌避雷器抗震能力较强,失效概率仅为 0.03;支架放大系数为1.915,大于现行规范中规定的最小取值 1.2,说明在实际研究中应考虑支架的实际放大作用.在地震易损性分析中,该避雷器的抗震能力中值为0.79 g.随着所考虑的不确定因素的增加,当遭遇的地震强度低于设备的抗震能力中位值时,电气设备的失效概率增大,当遭遇的地震强度高于设备的抗震能力中位值时,失效概率则降低.说明在分析电气设备的地震易损性时,应考虑多重不确定性的影响.本文的研究为避雷器的抗震设计以及在不同地震强度下的失效概率提供了有益的参考和借鉴价值.
Abstract
Arresters in substations are prone to damage during earthquakes,so it is necessary to conduct the seismic assessment.To investigate the seismic performance and vulnerability of a 220 kV surge arrester,a refined finite element model of the 220 kV zinc oxide surge arrester-bracket system was established.Through numerical simulations,seismic response analysis was conducted initially to study the seismic response characteristics and seismic resistance capability of the surge arrester.Subsequently,vulnerability analysis of the surge arrester was performed under multiple uncertainties,such as seismic motion,structural aspects of electrical equipment,and cognition.Finally,a probabilistic seismic demand model was established to fit the relationship curve between the failure probability and peak ground acceleration of the surge arrester.The results indicate that under the influence of a seismic action with a fortification intensity of 9 degrees,the 220 kV zinc oxide surge arrester exhibits strong seismic resistance,and the failure probability is only 0.03.The amplification factors for the bracket are 1.915,exceeding the minimum specified value of 1.2 in current standards.This suggests that the actual amplifying effect of the bracket should be considered in practical studies.Additionally,in seismic vulnerability analysis,the median seismic resistance capability of the surge arrester is 0.79 g.With the increase of the considered uncertain factors,when the seismic intensity encountered is below the median seismic resistance capability of the equipment,the probability of electrical equipment failure increases.Conversely,when the encountered seismic intensity is higher than the median seismic resistance capability of the equipment,the failure probability decreases.Therefore,the influence of multiple uncertainties should be considered when analyzing the seismic vulnerability of electrical equipment.The study in this article provides valuable reference and guidance for the seismic design of surge arresters and the assessment of failure probabilities under different seismic intensities.
关键词
避雷器/有限元分析/地震易损性/概率地震需求模型/多重不确定性Key words
arrester/finite element analysis/seismic fragility/probabilistic seismic demand model/multiple uncertainties引用本文复制引用
基金项目
南方电网公司科技项目(YNKJXM20220019)
出版年
2024
NETL
NSTL
万方数据