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电压互感器二次回路中性点击穿保险在线监测技术分析 被引量:2
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作者 戴向峰 《电工技术》 2023年第16期130-132,145,共4页
雷电等自然天气是影响变电站稳定安全运行的重要因素,变电站遭受雷击、雷电波入侵输电线路,很容易损坏电力线路及相关设备设施。在雷电冲击下,电压互感器二次回路中性点可能发生被击穿的情况,此时通过在线监测可明确中性点运行状态。为... 雷电等自然天气是影响变电站稳定安全运行的重要因素,变电站遭受雷击、雷电波入侵输电线路,很容易损坏电力线路及相关设备设施。在雷电冲击下,电压互感器二次回路中性点可能发生被击穿的情况,此时通过在线监测可明确中性点运行状态。为加大互感器二次回路中性点击穿保险监测力度,分析了中性点雷电传递过电压原理,并以国网江苏省电力有限公司所用电压互感器二次回路中性点击穿保险在线监测设备为研究对象,探讨了在线监测装置具体应用方法,以期为相关工作者提供参考。 展开更多
关键词 电压互感器 二次回路 中性击穿保险 在线监测
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发挥行业协会作用 促进保险业健康发展 被引量:1
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作者 谢文华 《福建金融》 2000年第8期8-10,共3页
关键词 保险行业协会 保险点 作用 保险市场 发展
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China's Global Shipping Connectivity:Internal and External Dynamics in the Contemporary Era(1890–2016) 被引量:6
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作者 Cesar DUCRUET WANG Liehui 《Chinese Geographical Science》 SCIE CSCD 2018年第2期202-216,共15页
China's global shipping connectivity had been somewhat overlooked as the bulk of related studies predominantly focused on the throughput volume of its own port cities. This article tackles such lacunae by providin... China's global shipping connectivity had been somewhat overlooked as the bulk of related studies predominantly focused on the throughput volume of its own port cities. This article tackles such lacunae by providing a relational perspective based on the extraction of vessel movement archives from the Lloyd's List corpus. Two complementary analyses are proposed: long-term dynamics with all ships included(1890–2008) and medium-term dynamics focusing on container flows(1978–2016). Each analysis examines China's maritime connectivity in various ways and on different spatial scales, from the global to the local, in terms of concentration, vulnerability, and expansion. The main results underline the influence of technological, economic, and political factors on the changing distribution of connectivity internally and externally. In particular, China has managed to reduce its dependence upon external transit hubs, to increase the internal connectivity of its own port system, and to strengthen its dominance towards an increasing number of foreign nodes and trade partners through the maritime network. 展开更多
关键词 China CONNECTIVITY maritime network port system vessel movements
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