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21. 发明授权

US06944554B2 Method for detecting fault on transmission lines by using harmonics and state transition diagram 失效
标题翻译：通过谐波和状态转换图检测传输线故障的方法
公开(公告)号：US06944554B2
公开(公告)日：2005-09-13
申请号：US10731467
申请日：2003-12-10
申请人： Chul-Hwan Kim , Jeong-Yong Heo
发明人： Chul-Hwan Kim , Jeong-Yong Heo
IPC分类号： H02H3/05 , G01R31/00 , G01R31/02 , G01R31/08 , G06F19/00 , H02H3/40 , H02H3/42 , H02H3/52
CPC分类号： G01R31/088 , H02H3/40 , H02H3/52
摘要： Disclosed is a method for detecting a fault by using harmonics and a state transition diagram. When the fault occurs on transmission lines, the fault is detected by using harmonics and the state transition diagram. Two logic signals are outputted by using apparent impedance of a steady state characteristic and a sum of harmonics components of a transient state characteristic. Such two logic signals are used as input parameters of the state transition diagram so that the state of an electric power system is presumed based on a state transition of the electric power system. It is possible to prevent a distance relay from being malfunctioned under an increase of load and unstable voltage. The state of the electric power system is presumed by using harmonics and the state transition diagram, and the fault on the transmission line is reliably detected.
摘要翻译：公开了一种通过使用谐波和状态转移图来检测故障的方法。当传输线发生故障时，通过使用谐波和状态转换图来检测故障。通过使用稳态特性的视在阻抗和瞬态特性的谐波分量之和来输出两个逻辑信号。这样的两个逻辑信号被用作状态转移图的输入参数，从而基于电力系统的状态转换来推定电力系统的状态。在负载增加和电压不稳定的情况下，可以防止距离继电器发生故障。通过使用谐波和状态转换图来推定电力系统的状态，并且可靠地检测到传输线路上的故障。

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