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1. 发明申请

US20160320437A1 Frequency Measuring Method and Measuring Device For Electricity System 审中-公开
标题翻译：频率测量方法和电力系统测量装置
公开(公告)号：US20160320437A1
公开(公告)日：2016-11-03
申请号：US15075793
申请日：2016-03-21
申请人： XJ GROUP CORPORATION , XJ ELECTRIC CO.,LTD , XUCHANG XJ SOFTWARE TECHNOLOGIES LTD , STATE GRID CORPORATION OF CHINA
发明人： Li Wang , Chuankun Ni , Baowei Li , Xu Li , Wenzheng Li , Yanmei Tang , Xin Shi , Huizhen Hao , Liping Meng
IPC分类号： G01R23/02
CPC分类号： G01R23/02
摘要： The invention relates to a frequency measuring method and measuring device. The method comprises: firstly sampling the current signal to be measured, and discretizing the sampled signals; secondly obtaining sampling matrixes [In] and [In,] of the current signal to be measured at time n and time n−1 from the discrete sampled signals, setting a reference frequency fref, constructing a reference voltage signal u(t) from fref, and discretizing u(t) to gain reference matrix; finally, attaining phase values of time n and time n−1 from the eigenvalues of matrixes [In]+[U] and [In−1]+[U], and determining a calculation frequency fcomp. The invention uses sampled matrixes constructed from the reference signals and the signals to be measured. Through QR decomposition and similarity transformation of matrixes and the eigenvalues calculation of the corresponding matrixes, phases of the matrixes to be measured are gained, and the frequencies of the signals to be measured are calculated through the phase difference between the former and the latter sampling moment. The solution simplifies calculating process and reduces calculation, in comparison to the prior art, and can calculate the frequencies of the sinusoidal signals quickly and precisely in the power frequency data window.
摘要翻译：本发明涉及一种频率测量方法和测量装置。该方法包括：首先对待测量的当前信号进行采样，并对采样信号进行离散化; 其次从离散采样信号获取在时间n和时间n-1要测量的当前信号的采样矩阵[In]和[In，]，设置参考频率fref，从fref构建参考电压信号u（t），并离散u（t）以获得参考矩阵; 最后，从矩阵[In] + [U]和[In-1] + [U]的特征值获得时间n和时间n-1的相位值，并确定计算频率fcomp。本发明使用由参考信号和要测量的信号构成的采样矩阵。通过矩阵的QR分解和相似变换以及相应矩阵的特征值计算，获得要测量的矩阵的相位，并通过前者和后一采样时刻之间的相位差来计算被测信号的频率。与现有技术相比，该解决方案简化了计算过程并减少了计算，并且可以在功率频率数据窗口中快速和精确地计算正弦信号的频率。

2. 发明申请

US20170163024A1 METHOD FOR PREVENTING DIFFERENTIAL PROTECTION MALOPERATION OF OPTICAL FIBER CAUSED BY SATURATION OF SINGLE CT OF 3/2 CONNECTION 审中-公开
公开(公告)号：US20170163024A1
公开(公告)日：2017-06-08
申请号：US15352349
申请日：2016-11-15
申请人： XJ GROUP CORPORATION , XJ ELECTRIC CO.,LTD , Xuchang XJ Software Technology Co.,Ltd , State Grid Corporation of China
发明人： Baowei Li , Chuankun Ni , Wenzheng Li , Xu Li , Ziqiang Jiang , Yanmei Tang , Huizhen Hao , Xin Shi , Jiansong Zhao , Xintao Dong , Yingying Xi , Quanxia Ma , Yantao Qiao , Yu Tang , Liping Meng
IPC分类号： H02H3/28
CPC分类号： H02H3/283
摘要： The present disclosure relates to a method for preventing a maloperation of differential protection of an optical fiber caused by saturation of a single Current Transformer (CT) of 3/2 connection. By applying a combination of the differential judgment and the sub-CT current judgment, reliable identification of internal and external faults is ensured, and the problem of misjudging of the internal fault as the external fault can be prevented as well.

3. 发明授权

US10622804B2 Method for preventing differential protection maloperation of optical fiber caused by saturation of single CT of 3/2 connection 有权
公开(公告)号：US10622804B2
公开(公告)日：2020-04-14
申请号：US15352349
申请日：2016-11-15
申请人： XJ GROUP CORPORATION , XJ ELECTRIC CO., LTD , Xuchang XJ Software Technology Co., Ltd , State Grid Corporation of China
发明人： Baowei Li , Chuankun Ni , Wenzheng Li , Xu Li , Ziqiang Jiang , Yanmei Tang , Huizhen Hao , Xin Shi , Jiansong Zhao , Xintao Dong , Yingying Xi , Quanxia Ma , Yantao Qiao , Yu Tang , Liping Meng
IPC分类号： H02H3/00 , H02H3/28
CPC分类号： H02H3/283
摘要： The present disclosure relates to a method for preventing a maloperation of differential protection of an optical fiber caused by saturation of a single Current Transformer (CT) of 3/2 connection. By applying a combination of the differential judgment and the sub-CT current judgment, reliable identification of internal and external faults is ensured, and the problem of misjudging of the internal fault as the external fault can be prevented as well.

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