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电缆开裂原因分析 总被引:1,自引:0,他引:1
岭澳核电站主控室照明用电缆(核级K3类),运行不到3年,伸入灯管段的电缆芯线绝缘发生变色脆化开裂现象,而其它低压动力电缆未发现有该异常现象。为了验证现场所用类似电缆的整体可靠性,项目组对4种不同电缆的样品进行了性能测试,并对该电缆芯线绝缘的开裂机理进行了分析。分析认为:在光、热、氧、应力的共同作用下,该照明电缆芯线绝缘发生了变色及脆性开裂,绝缘材料的耐光性较差。建议的纠正行动是:一方面,目前应改变主控室照明电缆在灯光侧的接线方式,芯线不能直接裸露在灯光下;另一方面,在电缆有可能受到灯光照射或类似环境时,电缆护套及绝缘材料设计应有耐光性的要求。 相似文献
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A software network model with multiple links is constructed on the basis of a dynamical model of a general complex network with multiple links. The principle of network division of multiple links is introduced. Following these principles, the software network model is decomposed into three types of subnets and different relationships between classes are revealed. Then, the dynamic analysis of software networks is presented. A sufficient condi-tion for the stability of general complex networks is obtained followed by that of software networks. Fi-nally, the dynamics of an open-source software sys-tem is analyzed, and their simulations are provided to demonstrate the effectiveness of the presented model. 相似文献
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介绍了预应力鱼腹式梁结构形式在连云港工业展览中心基坑支护中的应用,阐述了其结构受力特点和施工方法.实践表明:预应力鱼腹式梁结构不仅能保证基坑支护的安全,而且显著改善了基坑内作业的施工空间,大大地减少了支护结构的安装、拆除工作量,有效地降低了工程造价,缩短施工周期,为其他深基坑支护结构的设计与施工提供了借鉴. 相似文献