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    DETECTION OF A FAULT IN AN UNGROUNDED ELECTRIC POWER DISTRIBUTION SYSTEM
    13.
    发明申请
    DETECTION OF A FAULT IN AN UNGROUNDED ELECTRIC POWER DISTRIBUTION SYSTEM 有权
    检测无功电力分配系统中的故障

    公开(公告)号：US20150077133A1

    公开(公告)日：2015-03-19

    申请号：US14477495

    申请日：2014-09-04

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Normann Fischer ,  Amandeep Singh Kalra

    IPC: G01R31/08

    CPC classification number: G01R31/08 ,  G01R31/085 ,  G01R31/086 ,  G01R31/088 ,  H02H3/165 ,  Y04S10/522

    Abstract: Detection of a fault in an ungrounded electric power distribution system that includes a plurality of feeders and buses is disclosed herein. Embodiments consistent with the present disclosure may monitor an electrical parameter associated with each of a plurality of feeders and buses in the ungrounded electric power distribution system. An incremental change in the monitored electrical parameters may be determined using the monitored electrical parameter. Further, the incremental change may be associated with a first sub-set of the plurality of feeders. Torque values for the feeders may be calculated using a reference quantity from the bus first exhibiting an incremental change above a threshold. A feeder having the largest incremental change in the first sub-set of the plurality of feeders may be identified. A fault may be identified based on the torque and the incremental change.

    Abstract translation: 本文公开了包括多个馈线和总线的未接地配电系统中的故障的检测。 与本公开一致的实施例可以监测与未接地电力分配系统中的多个馈线和总线中的每一个相关联的电参数。 可以使用所监视的电参数来确定所监视的电参数的增量变化。 此外，增量变化可以与多个馈送器的第一子集相关联。 可以使用来自总线的参考数量来计算进给器的扭矩值，其中显示出高于阈值的增量变化。 可以识别在多个馈送器的第一子集中具有最大增量变化的馈线。 可以基于扭矩和增量变化来识别故障。

    SINGLE PHASE BROKEN CONDUCTOR DETECTION
    14.
    发明申请
    SINGLE PHASE BROKEN CONDUCTOR DETECTION 有权

    公开(公告)号：US20250147123A1

    公开(公告)日：2025-05-08

    申请号：US18503273

    申请日：2023-11-07

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Yanfeng Gong ,  Normann Fischer ,  Gandhali P. Juvekar ,  Kanchanrao Gangadhar Dase

    IPC: G01R31/54 ,  H02H1/00 ,  H02H6/00

    Abstract: The present disclosure relates to systems and methods to detect a fault in an electric power system. One embodiment may detect a single phase broken conductor in a multi-phase electric power system. An intelligent electronic device (IED) may receive a plurality of measurements over time of a current through an electrical conductor in the electric power system. Based on the measurements of the current, a fault detection subsystem may determine a zero-sequence current, a negative-sequence current, and a positive-sequence current. The fault detection subsystem may determine a ratio of the zero-sequence current, the negative-sequence current, and the positive-sequence current, and may monitor the ratio over time. The fault detection subsystem may identify the broken conductor condition based on the ratio and a fault detection region. A protective action subsystem may implement a protective action based on identification of the broken conductor condition.

    ADAPTIVE PROTECTIVE RELAY EVENT REPORTS
    15.
    发明申请
    ADAPTIVE PROTECTIVE RELAY EVENT REPORTS 有权

    公开(公告)号：US20250132599A1

    公开(公告)日：2025-04-24

    申请号：US18490145

    申请日：2023-10-19

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Normann Fischer ,  Douglas I. Taylor ,  Ritwik Chowdhury

    IPC: H02J13/00 ,  H02H1/00

    Abstract: The present application relates to generating adaptive protective relay event reports. In one embodiment, a system comprises a power system response subsystem to monitor electrical parameters in an electric power system and to receive a trigger signal from a trigger source based on identification of an event in an electric power system. An adaptive event report subsystem is configured to generate an adaptive report depending on the trigger related to the event and based on a pre-trigger start, a duration, and a sampling rate. The adaptive event report comprises at least one electrical parameter related to the event beginning at a time established by the pre-trigger start, covering an interval established by the duration, and recorded at the sampling rate.

    Accurate modeling of equipment overexcitation damage curves
    16.
    发明授权
    Accurate modeling of equipment overexcitation damage curves 有权

    公开(公告)号：US11631972B2

    公开(公告)日：2023-04-18

    申请号：US17123450

    申请日：2020-12-16

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Ritwik Chowdhury ,  Dale S. Finney ,  Normann Fischer ,  Matchyaraju Alla

    IPC: G01R31/34 ,  H02H1/00 ,  G05B19/042 ,  H02H7/04 ,  G01R31/62

    Abstract: The present disclosure relates to systems and methods for protecting against and mitigating the effects of over-excitation of elements in electric power systems. In one embodiment, a system consistent with the present disclosure may comprise a point pair subsystem to receive a plurality of point pairs that define an over-excitation curve for a piece of monitored equipment. The system may receive a plurality of measurements corresponding to electrical conditions associated with the piece of monitored equipment. A logarithmic interpolation subsystem may determine a logarithmic interpolation corresponding to one of the plurality of measurements based on the plurality of point pairs. An over-excitation detection subsystem may detect an over-excitation condition based on the logarithmic interpolation, and a protective action subsystem may implement a protective action based on the over-excitation condition.

    Generator loss-of-field protection
    17.
    发明授权
    Generator loss-of-field protection 有权

    公开(公告)号：US11196369B2

    公开(公告)日：2021-12-07

    申请号：US16425763

    申请日：2019-05-29

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Matchyaraju Alla ,  Armando Guzman-Casillas ,  Dale S. Finney ,  Normann Fischer

    IPC: H02P9/00 ,  G01R31/34 ,  H02P29/40 ,  H02H7/06

    Abstract: Protection devices prevent damage to synchronous generators during loss-of-field events. In various embodiments, a first protective element is associated with a first protection zone to protect a generator from a loss-of-field event at full load. A second protective element is associated with a second protection zone to prevent thermal overload during underexcited operation of the generator and to protect from loss-of-filed at light load. A third protective element associated with a third protection zone limits operation of the generator within the generator's specific steady-state stability limits. A fourth protective element is associated with a fourth protection zone to provide an alarm prior to operation of the second protective element. In various embodiments, characteristics and limits of each of the protective elements are defined in the same plane (specifically, the P-Q plane) to simplify settings and allow for visualization of the element characteristics and the generator capability curve at one or more temperatures or cooling capacities.

    Systems and methods for system-wide digital process bus fault recording
    19.
    发明授权
    Systems and methods for system-wide digital process bus fault recording 有权

    公开(公告)号：US10270859B2

    公开(公告)日：2019-04-23

    申请号：US15295839

    申请日：2016-10-17

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Qiaoyin Yang ,  Normann Fischer

    IPC: H02H7/00 ,  H04L29/08 ,  G01D9/00 ,  H02H1/00 ,  H02J13/00

    Abstract: The present disclosure provides systems and methods for generating a system-wide event report for electrical power delivery systems. A monitoring device within the power system may generate a key message upon the occurrence of a predetermined condition. A master IED within the power system may generate and/or transmit a system-wide key message to a plurality of monitoring IEDs within the power system. Digital process bus data, continuously recorded by a plurality of monitoring IEDs within the power system, may be saved locally by each monitoring IED within the power system and retrieved by a master IED within the power system. Alternatively, digital process bus data may be transmitted to a master IED and saved locally. A software and/or hardware module may be used to merge the local reports into a system-wide event report.

    HIGH-IMPEDANCE DIFFERENTIAL PROTECTION USING A DIVERSITY OF SIGNALS
    20.
    发明公开
    HIGH-IMPEDANCE DIFFERENTIAL PROTECTION USING A DIVERSITY OF SIGNALS 审中-公开

    公开(公告)号：US20240250518A1

    公开(公告)日：2024-07-25

    申请号：US18419092

    申请日：2024-01-22

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Normann Fischer ,  Anushka M. Dissanayake ,  Jay Hartshorn ,  Marcos A. Donolo

    IPC: H02H7/045 ,  H02H1/00 ,  H02H7/04

    CPC classification number: H02H7/045 ,  H02H1/0007 ,  H02H7/042

    Abstract: A system for high-impedance differential protection for power systems using a variety of signals from the power system. A fault may be detected using filtered phase current or filtered phase voltage magnitudes from current transformers (CTs) connected in parallel by phase. A fault may be detected using filtered phase voltages and raw phase voltages from the CTs. A fault may be detected using raw phase currents and raw phase voltages from the CTs. A fault may be detected using filtered phase currents and raw phase currents. A fault may be detected using raw phase currents and raw neutral currents. The embodiments herein maintain dependability and security of a differential element even when low-class CTs are used. The embodiments herein may allow users to optimize pickup settings even when low-class CTs are used.

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