Gaoya dianqi, 2006 针对现有的小电流接地选线装置选线准确率不高及存在选线死区等问题,通过分析小电流接地系统单相接地时的特性,综合分析各种选线方法,提出以采用目前稳态法中准确度最高的零序功率法为主判据,以5次谐波相位法为二次判据的选线方案。使用ATP仿真软件对某个110/10 kV变电站单相接地故障进行模拟,结果显示对于不同的接地电阻和接地位置,该判据均能准确判断出故障线路。由此设计了基于PC104工控机的新型小电流接地选线装置。
徒有锋 +4 more
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Gaoya dianqi, 2012 笔者分析了利用架空线路作为电流、电压线测量接地网接地电阻的误差来源,指出了线路的架空地线未与地绝缘是产生测量误差的根本原因。通过建立数学模型研究了变电站接地电阻值、电流回路电阻值、杆塔接地电阻值、架空地线类型的改变对接地电阻测量误差的影响;指出接地装置对地电压测量偏差主要受架空地线的短接范围的影响。为了减小大电流法测量接地装置接地电阻的误差,应当令测试范围内架空地线对地绝缘或采取人工放线的方式。
刘玮, 聂葳, 陈智, 徐鹏
doaj
[Analysis of setup errors and their correlation with clinical factors in image-guided radiotherapy for prostate cancer using different immobilization devices]. [PDF]
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