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    METHOD AND APPARATUS FOR DETECTING VECTOR SHIFT
    1.
    发明申请
    METHOD AND APPARATUS FOR DETECTING VECTOR SHIFT 审中-公开
    用于检测矢量移位的方法和装置

    公开(公告)号：US20160334446A1

    公开(公告)日：2016-11-17

    申请号：US15097067

    申请日：2016-04-12

    申请人： ABB Technology AG

    发明人： Frej Suomi

    IPC分类号： G01R23/165 ,  G01R23/02

    CPC分类号： G01R23/165 ,  G01R19/2513 ,  G01R23/02 ,  H02H3/343 ,  H02H3/353 ,  H02J13/0006 ,  H02J2003/388

    摘要： A method and an apparatus for detecting a vector shift in an AC power system, the apparatus comprising frequency measuring means (10) adapted to determine a frequency of the AC power system, derivation means (20) adapted to determine a time derivative of the frequency, filtering means (30) adapted to filter the time derivative of the frequency, and detection means (40, 50, 60, 70) adapted to calculate time derivatives for the filtered time derivatives of the frequency over a time period having the length of the fundamental period of the AC power system, to determine a number of positive and negative time derivatives among the calculated time derivatives, and to detect a vector shift in the AC power system in response to an absolute value of a difference between the determined number of positive time derivatives and negative time derivatives exceeding a predetermined threshold value.

    摘要翻译： 一种用于检测AC电力系统中的矢量移位的方法和装置，所述装置包括适于确定AC电力系统的频率的频率测量装置（10），适于确定频率的时间导数的导出装置（20） ，适于对频率的时间导数进行滤波的滤波装置（30）以及适于计算具有长度为的时间段内的频率的滤波时间导数的时间导数的检测装置（40,50,60,70） 确定交流电力系统的基本周期，以确定所计算的时间导数之间的正数和负时间导数的数量，并且响应于确定的正数之间的差的绝对值来检测交流电力系统中的向量偏移 时间导数和负时间导数超过预定阈值。

    Fault detection circuit for use in determining the existence of a fault in any one of a plurality of DC loads
    3.
    发明授权
    Fault detection circuit for use in determining the existence of a fault in any one of a plurality of DC loads 失效
    故障检测电路用于确定多个DC负载中的任何一个中的故障的存在

    公开(公告)号：US5315256A

    公开(公告)日：1994-05-24

    申请号：US982398

    申请日：1992-11-27

    申请人： Martin Schuyler

    发明人： Martin Schuyler

    IPC分类号： H02H3/353 ,  G01R31/02

    CPC分类号： H02H3/353

    摘要： A fault detection circuit for a plurality of DC loads uses a reference load as a benchmark. The voltages at the centerpoints of the loads to be monitored are monitored and compared with the voltage of the centerpoint of the reference load. The comparison is affected by faults which do not affect all loads equally (as by a short or open) and is unaffected by faults which do affect all loads equally (as by changes in voltage of the source).

    摘要翻译： 用于多个DC负载的故障检测电路使用参考负载作为基准。 监测要监测的负载的中心点处的电压，并将其与参考负载的中心点的电压进行比较。 该比较受到不影响所有负载（如短路或开路）的故障的影响，并且不受同时影响所有负载的故障（如通过电源电压的变化）的影响。

    Method for identifying element failure in capacitor banks
    7.
    发明授权
    Method for identifying element failure in capacitor banks 有权

    公开(公告)号：US11923676B2

    公开(公告)日：2024-03-05

    申请号：US17400907

    申请日：2021-08-12

    申请人： MHO TECHNOLOGIES CORP.

    发明人： Haijie Wang

    IPC分类号： H02H7/16 ,  H02H3/04 ,  H02H3/353

    CPC分类号： H02H7/16 ,  H02H3/042 ,  H02H3/353

    摘要： A method for identifying element failure in capacitor banks is provided. Capacitor bank phase current is measured and a zero-sequence or negative-sequence current is calculated or measured. A three-phase voltage is measured from a three-phase bus voltage transformer and a zero-sequence voltage or negative-sequence voltage is calculated. A compensated unbalance current is calculated and compared to a predetermined acceptable range. A failure is identified where the compensated unbalance current is outside the predetermined acceptable range.

    Insulation diagnosis device
    8.
    发明申请
    Insulation diagnosis device 审中-公开
    绝缘诊断装置

    公开(公告)号：US20030098694A1

    公开(公告)日：2003-05-29

    申请号：US10078400

    申请日：2002-02-21

    发明人： Yasunobu Fujita ,  Naoki Kawamura

    IPC分类号： H04B003/46 ,  H01H031/02

    CPC分类号： H02H1/0015 ,  H02H3/347 ,  H02H3/353

    摘要： An insulation diagnosis device for diagnosing insulation deterioration in a non-grounded type electric power distribution system provided with a computation processing unit which calculates an intermittent flash grounding and which is inputted of zero phase voltages and line voltages and includes a peak hold processing unit, a peak hold reset processing unit and a phase region detection and processing unit. Thereby, an insulation diagnosis device is provided which can always diagnose insulation deterioration safely under actual use condition without stopping the concerned electric power installation, and, at the time of intermittent flash grounding occurrence, can specify existence and non-existence of grounding occurrence before activation of a protective relay.

    摘要翻译： 一种绝缘诊断装置，用于诊断具有计算处理单元的非接地型配电系统中的绝缘劣化的绝缘诊断装置，所述计算处理单元计算间歇闪光接地并输入零相电压和线电压，并包括峰值保持处理单元， 峰值保持复位处理单元和相位区域检测和处理单元。 因此，提供绝缘诊断装置，其可以在实际使用状态下始终在安全地诊断绝缘劣化而不停止有关的电力设备，并且在间歇性闪电接地发生时，可以指定在激活之前存在和不存在接地发生 的保护继电器。

    Fault detection circuit for use in determining the existence of a fault in any one of a plurality of multi-phase loads
    9.
    发明授权
    Fault detection circuit for use in determining the existence of a fault in any one of a plurality of multi-phase loads 失效
    故障检测电路，用于确定多个多相负载中的任何一个中是否存在故障

    公开(公告)号：US5168236A

    公开(公告)日：1992-12-01

    申请号：US703005

    申请日：1991-05-20

    申请人： Martin Schuyler

    发明人： Martin Schuyler

    IPC分类号： H02H3/353

    CPC分类号： H02H3/353

    摘要： A fault detection circuit for a plurality of three-phase loads uses a wye-connected reference load as a benchmark. The voltages at the centerpoints of the loads to be monitored are monitored and the largest monitored voltage is identified. This largest voltage is compared with the voltage of the centerpoint of the reference load. The comparison is affected by faults which do not affect all loads equally (as by a short or open in one of the phases of one of the loads) and is unaffected by faults which do affect all loads equally (as by changes in voltage of one of the phases of the source).

    摘要翻译： 用于多个三相负载的故障检测电路使用以叶片为基准的参考负载作为基准。 监控要监测的负载的中心点处的电压，并识别最大的监测电压。 将该最大电压与参考负载的中心点的电压进行比较。 该比较受到不影响所有负载的故障的影响（如通过其中一个负载的一个相中的短路或开路），并且不受同样影响所有负载的故障的影响（如通过一个电压的变化 的来源）。

    Reactor fault relay
    10.
    发明授权
    Reactor fault relay 失效
    反应器故障继电器

    公开(公告)号：US3699391A

    公开(公告)日：1972-10-17

    申请号：US3699391D

    申请日：1971-09-02

    申请人： US INTERIOR

    发明人： EILTS LARRY E

    IPC分类号： H02H3/16 ,  H02H3/353

    CPC分类号： H02H3/353 ,  H02H3/165

    摘要： A relay for protecting three-phase, wye-connected circuits by monitoring neutral voltage. To prevent relay operation during normal unbalanced conditions, the current input to each phase is monitored, and relay operation enabled only when three currents are present.

    摘要翻译： 用于通过监测中性点电压来保护三相，Y形连接电路的继电器。 为了防止在正常不平衡条件下的继电器动作，监视每相的电流输入，只有存在三个电流时，继电器运行才能使能。