变电站室外端子箱凝露可能引起直流接地等异常,严重威胁电网的安全运行。以一座220 k V变电站为例,深入分析造成端子箱凝露的原因,结合多年来防治端子箱凝露的经验,提出具体的改进措施,采取电缆沟湿热空气释放、端子箱底部标准封堵、端...变电站室外端子箱凝露可能引起直流接地等异常,严重威胁电网的安全运行。以一座220 k V变电站为例,深入分析造成端子箱凝露的原因,结合多年来防治端子箱凝露的经验,提出具体的改进措施,采取电缆沟湿热空气释放、端子箱底部标准封堵、端子箱内驱潮元件合理布局、端子箱顶部加装保温材料的综合方法。运行实践证明,设计的装置制作简单,材料购买容易且价格低,安装维护方便,具有良好的防凝露效果。展开更多
In this paper,the author establishes the concepts of relative self-compatibility andrelative finite derivability of languages and obtains the relation between self-compatibilityand relative self-compatibility.From thi...In this paper,the author establishes the concepts of relative self-compatibility andrelative finite derivability of languages and obtains the relation between self-compatibilityand relative self-compatibility.From this it is proved that a family of languages isnondeterministically recognizable if and only if it is relatively self-compatible andrelatively finitely derivable to some set of families of langugaes.展开更多
文摘变电站室外端子箱凝露可能引起直流接地等异常,严重威胁电网的安全运行。以一座220 k V变电站为例,深入分析造成端子箱凝露的原因,结合多年来防治端子箱凝露的经验,提出具体的改进措施,采取电缆沟湿热空气释放、端子箱底部标准封堵、端子箱内驱潮元件合理布局、端子箱顶部加装保温材料的综合方法。运行实践证明,设计的装置制作简单,材料购买容易且价格低,安装维护方便,具有良好的防凝露效果。
基金This work was supported in part by Beijing-Hong Kong Academic Exchange Centre.
文摘In this paper,the author establishes the concepts of relative self-compatibility andrelative finite derivability of languages and obtains the relation between self-compatibilityand relative self-compatibility.From this it is proved that a family of languages isnondeterministically recognizable if and only if it is relatively self-compatible andrelatively finitely derivable to some set of families of langugaes.
