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34 条记录 (耗时 0.033 秒)

    Crossover fault classification for power lines with parallel circuits
    31.
    发明授权
    Crossover fault classification for power lines with parallel circuits 失效
    具有并联电路的电力线交叉故障分类

    公开(公告)号：US06721670B2

    公开(公告)日：2004-04-13

    申请号：US09951267

    申请日：2001-09-13

    申请人： James D. Stoupis ,  David Lubkeman ,  Reto Buettner ,  David G. Hart

    发明人： James D. Stoupis ,  David Lubkeman ,  Reto Buettner ,  David G. Hart

    IPC分类号： G06F1300

    CPC分类号： H02H1/00 ,  H02H3/286 ,  H02H7/267

    摘要： The invention describes a method, system, device, and computer-readable medium having computer-executable instructions for classifying faults on an electrical power line. In particular, the invention permits the classification of crossover faults using a local measurement technique. The inventive method includes providing a first electrical power transmission line and a second electrical power transmission line, and monitoring the first electrical power transmission line to identify a crossover fault occurring between the first and the second electrical power transmission lines.

    摘要翻译： 本发明描述了具有用于对电力线上的故障进行分类的计算机可执行指令的方法，系统，设备和计算机可读介质。 特别地，本发明允许使用局部测量技术对交叉故障进行分类。 本发明的方法包括提供第一电力传输线和第二电力传输线，并且监视第一电力传输线以识别出现在第一和第二电力传输线之间的交叉故障。

    Generator protection system and method for phasor estimation and frequency tracking during frequency ramping
    33.
    发明授权
    Generator protection system and method for phasor estimation and frequency tracking during frequency ramping 失效
    发电机保护系统和频率估计和频率跟踪频率跟踪方法

    公开(公告)号：US5832413A

    公开(公告)日：1998-11-03

    申请号：US939514

    申请日：1997-09-29

    申请人： Joseph P. Benco ,  Frederick P. Perfect ,  David G. Hart ,  James D. Stoupis

    发明人： Joseph P. Benco ,  Frederick P. Perfect ,  David G. Hart ,  James D. Stoupis

    IPC分类号： G01R19/25 ,  G01R23/00 ,  G01R23/16 ,  G01R23/10

    CPC分类号： G01R19/2513 ,  G01R23/16 ,  G01R23/00

    摘要： A method for estimating phasors and tracking the frequency of a signal during frequency ramping is provided. The method uses a variable N-point DFT periodically to compute one or more phasors based on data acquired from one or more sampled signals. The period between DFT computations is a predetermined number of sample periods. After each DFT computation, the change in phasor angle between the current phasor estimate and the most previous phasor estimate is determined and used to estimate the instantaneous frequency of the signal. The current instantaneous frequency estimate and the most previous instantaneous frequency estimate are averaged to compute an average cycle frequency. In addition, a number of discrete frequencies and corresponding DFT windows based on a fixed sampling rate and a predetermined fundamental frequency of the signal are defined and used in estimating the instantaneous frequency. Once the average cycle frequency is determined the DFT window is adjusted by setting it equal to the DFT window corresponding to the discrete frequency closest to the average cycle frequency. A generator protection system analyzing voltage and current signals output from a generator is also provided. The voltage and current signals are monitored by respective voltage and current sensors to produce a plurality of signals representative of voltage and current characteristics of the generator. The system comprises components for receiving and sampling signal input, and for processing the samples according to the inventive method.

    摘要翻译： 提供了一种用于在频率斜坡期间估计相量并跟踪信号频率的方法。 该方法使用可变N点DFT周期性地基于从一个或多个采样信号获取的数据来计算一个或多个相量。 DFT计算之间的周期是预定数量的采样周期。 在每个DFT计算之后，确定当前相量估计与最先前相量估计之间的相量角的变化，并用于估计信号的瞬时频率。 对当前瞬时频率估计和最先前的瞬时频率估计进行平均以计算平均周期频率。 另外，基于固定采样率和信号的预定基频定义了多个离散频率和相应的DFT窗口，并用于估计瞬时频率。 一旦确定平均周期频率，则通过将DFT窗口设置为等于最接近平均周期频率的离散频率的DFT窗口来调整DFT窗口。 还提供了分析从发电机输出的电压和电流信号的发电机保护系统。 电压和电流信号由相应的电压和电流传感器监测，以产生代表发电机的电压和电流特性的多个信号。 该系统包括用于接收和采样信号输入的组件，并且用于根据本发明的方法处理样本。