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    Coordinated high-impedance fault detection systems and methods
    1.
    发明授权
    Coordinated high-impedance fault detection systems and methods 有权
    协调的高阻抗故障检测系统和方法

    公开(公告)号：US09160158B2

    公开(公告)日：2015-10-13

    申请号：US14052449

    申请日：2013-10-11

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Edmund O. Schweitzer, III ,  Mangapathirao Venkata Mynam ,  Daqing Hou

    IPC: H02H3/08 ,  H02H3/52 ,  H02H7/26

    CPC classification number: H02H3/08 ,  H02H3/52 ,  H02H7/261

    Abstract: Systems and methods are presented for detecting high-impedance faults (HIFs) in an electric power delivery system using a plurality of coordinated high-impedance fault detection systems. In certain embodiments, a method for HIFs may include receiving first and second current representations associated with first and second locations of the electric power delivery system respectively. Based on at least one of the first and second current representations, the occurrence of an HIF may be determined. A relative location of the HIF may be determined based on a relative amount of interharmonic content associated with an HIF included in the first and second current representations, and a protective action may be taken based on the determined relative location.

    Abstract translation: 提出了用于检测使用多个协调的高阻抗故障检测系统的电力输送系统中的高阻抗故障（HIF）的系统和方法。 在某些实施例中，用于HIF的方法可以包括分别接收与电力输送系统的第一和第二位置相关联的第一和第二电流表示。 基于第一和第二电流表示中的至少一个，可以确定HIF的发生。 可以基于与包括在第一和第二当前表示中的HIF相关联的间谐波内容的相对量来确定HIF的相对位置，并且可以基于所确定的相对位置来采取保护动作。

    COORDINATED HIGH-IMPEDANCE FAULT DETECTION SYSTEMS AND METHODS
    4.
    发明申请
    COORDINATED HIGH-IMPEDANCE FAULT DETECTION SYSTEMS AND METHODS 有权
    协调的高阻抗故障检测系统和方法

    公开(公告)号：US20140104738A1

    公开(公告)日：2014-04-17

    申请号：US14052449

    申请日：2013-10-11

    Applicant: SCHWEITZER ENGINEERING LABORATORIES, INC.

    Inventor： Edmund O. Schweitzer, III ,  Mangapathirao Venkata Mynam ,  Daqing Hou

    IPC: H02H3/08

    CPC classification number: H02H3/08 ,  H02H3/52 ,  H02H7/261

    Abstract: Systems and methods are presented for detecting high-impedance faults (HIFs) in an electric power delivery system using a plurality of coordinated high-impedance fault detection systems. In certain embodiments, a method for HIFs may include receiving first and second current representations associated with first and second locations of the electric power delivery system respectively. Based on at least one of the first and second current representations, the occurrence of an HIF may be determined. A relative location of the HIF may be determined based on a relative amount of interharmonic content associated with an HIF included in the first and second current representations, and a protective action may be taken based on the determined relative location.

    Abstract translation: 提出了用于检测使用多个协调的高阻抗故障检测系统的电力输送系统中的高阻抗故障（HIF）的系统和方法。 在某些实施例中，用于HIF的方法可以包括分别接收与电力输送系统的第一和第二位置相关联的第一和第二电流表示。 基于第一和第二电流表示中的至少一个，可以确定HIF的发生。 可以基于与包括在第一和第二当前表示中的HIF相关联的间谐波内容的相对量来确定HIF的相对位置，并且可以基于所确定的相对位置来采取保护动作。

    FREQUENCY ESTIMATION AND TRACKING USING CURRENT
    5.
    发明申请
    FREQUENCY ESTIMATION AND TRACKING USING CURRENT 有权

    公开(公告)号：US20220178976A1

    公开(公告)日：2022-06-09

    申请号：US17113725

    申请日：2020-12-07

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Kei Hao ,  Daqing Hou

    IPC: G01R19/25 ,  G01R21/133 ,  G01R19/175

    Abstract: The present disclosure relates to systems and methods tracking an alternating current frequency in an electric power system. In one embodiment, a system may include a waveform receiving subsystem to receive a representation of a current waveform. A sampling subsystem may sample the representation of a current waveform at a first estimated frequency and generate a sampled representation of the current waveform. A filtered and sampled representation of the current waveform may be generated using a filter subsystem. A period subsystem may determine an estimated period of the filtered and sampled representation of the current waveform. A frequency determination subsystem may determine a second estimated frequency based on the estimated period. The second estimated frequency may then be used by the sampling subsystem in a subsequent iteration to sample a subsequent representation of the current waveform.

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