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合并运行两单回线路的保护适应性
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作者 任小平 《贵州电力技术》 2009年第7期33-34,32,共3页
根据系统发展需求,需将海桐Ⅰ回、海桐Ⅱ回两单回路合并成一回导线为双分裂结构的单回线路,本文从差动保护、距离保护、零序保护三方面分析各种线路保护的适应性。
关键词 线路合并 差动保护 距离保护 零序保护 整定
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基于双目测距的输电线交叉跨越测量 被引量:6
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作者 孙胜男 吕玉祥 +2 位作者 王帅 南永兵 邵亦博 《高电压技术》 EI CAS CSCD 北大核心 2018年第11期3657-3663,共7页
高压输电线间距过小时容易出现相间闪络和短路等故障,为预防此类故障带来的危害,提出了基于双目测距的输电线交叉跨越测量方法。该方法基于改进的链码算法,设计了一种输电线自动检测算法,以提取输电线的像素坐标;依据双目测距原理,建立... 高压输电线间距过小时容易出现相间闪络和短路等故障,为预防此类故障带来的危害,提出了基于双目测距的输电线交叉跨越测量方法。该方法基于改进的链码算法,设计了一种输电线自动检测算法,以提取输电线的像素坐标;依据双目测距原理,建立了输电线交叉跨越几何测量模型,计算了输电线间距。最后将该方法应用于对山西阳泉2条输电线的现场测量中。实际测量结果表明,该方法可以有效地对待测线路进行检测、拟合与合并,能够准确地获取待测线路的像素坐标;在几何测量模型中,待测的2条线路无论是平行,还是交叉跨越,均可被准确测量,实现了自动检测与无接触测量。与全站仪测量结果相比,新方法的最大测量误差〈2%,证明新方法准确有效,满足实际测量要求。 展开更多
关键词 输电线路 交叉跨越 改进链码 线路合并 双目测距 几何测量模型
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Teaching Business English Course: Incorporating Portfolio Assessment-based Blended Learning and MOOC
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作者 YANG Xiao GAO Hao 《Journal of Literature and Art Studies》 2018年第9期1364-1369,共6页
Recent years have witnessed the growth of the popularity of open online learning platforms in China’s colleges and universities. This not only promotes the change of teaching concept and the reform of teaching method... Recent years have witnessed the growth of the popularity of open online learning platforms in China’s colleges and universities. This not only promotes the change of teaching concept and the reform of teaching methodology, but also provides a broad new opportunity for the teaching resource integration between universities in China and the prestigious universities in the world. However, with MOOC’s booming and spreading, educators and teachers have also found its limitations during the course of teaching and learning. This paper focuses on the design and the application of the integration of blended learning model and MOOC in Business English Course by selective use of the Open Course Ware of MIT Management School. With the advanced e-portfolio assessment as the standard for students’ achievement, it aims to reveal that the proposed model can trigger students’ study interest and cultivate their autonomous study, corporate learning as well as creative thinking ability. 展开更多
关键词 MOOCs Blended learning PORTFOLIO Business English
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