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气体绝缘金属封闭输电线路地震响应的薄弱部位及其响应规律

DOI: 10.13336/j.1003-6520.hve.2015.05.003, PP. 1437-1445

Keywords: 气体绝缘金属封闭输电线路,地震响应,模态振型,反应谱分析,抗震分析,薄弱部位,参数优化

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Abstract:

针对地震中气体绝缘金属封闭输电线路(GIL)的潜在故障问题,基于海南昌江某项目220kVGIL物理结构,建立了三相输电管道水平敷设下的3维有限元模型,并提出依据现行设计规范模拟GIL地震响应的分析方法。首先通过模态分析获得了GIL结构的振型特性,利用反应谱分析方法研究了不同地震反应谱激励下GIL地震响应的薄弱部位;然后对不同地震激励下GIL的抗震性能进行了具体评估,并进一步对GIL薄弱部位的地震响应规律进行分析总结。结果表明建模所依据的220kVGIL输电管道结构能够耐受6度的地震烈度,但对于7度及以上的地震烈度,其有损坏的可能;绝缘子和导体是GIL结构地震响应的薄弱部位;合理选取绝缘子和导体的机械参数能有效提高GIL的抗震能力。

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