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    Line reactor protection security using local frequency measurement
    1.
    发明授权
    Line reactor protection security using local frequency measurement 有权

    公开(公告)号：US12176716B2

    公开(公告)日：2024-12-24

    申请号：US18459691

    申请日：2023-09-01

    Applicant: Schweitzer Engineering Laboratories, Inc.

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

    IPC: H02J3/24 ,  H02H7/22 ,  H02J3/00 ,  H02J3/01

    Abstract: The present application discloses systems and methods related to protection of a reactor in an alternating current (AC) electric power system. In one embodiment, a system may include a protective action subsystem to implement a protective action based on identification of a fault condition associated with a reactor. A frequency determination subsystem may determine when a frequency of the AC voltage is outside of a range defined by a lower threshold and an upper threshold and may identify a change in the frequency associated with de-energization of a line in electrical communication with the reactor. A supervisory subsystem may restrain implementation of the protective action when the frequency is outside of the range or when the change in the frequency is associated with de-energization of the line in electrical communication with the reactor.

    SPLIT-PHASE PROTECTION OF GENERATORS
    2.
    发明公开
    SPLIT-PHASE PROTECTION OF GENERATORS 审中-公开

    公开(公告)号：US20240072697A1

    公开(公告)日：2024-02-29

    申请号：US17823344

    申请日：2022-08-30

    Applicant: Schweitzer Engineering Laboratories, Inc.

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

    IPC: H02P9/00

    CPC classification number: H02P9/006 ,  H02P2103/20

    Abstract: The present disclosure pertains to devices, systems, and methods for monitoring a generator. In one embodiment, the system may include a measurement subsystem to receive a plurality of split-phase measurements of branch currents associated with the at least one generator. A split-phase transverse differential monitoring subsystem may receive the plurality of split-phase measurements of branch currents associated with the at least one generator and may generate an offset value representing a standing split-phase current. A protective action subsystem may generate a first protective action based on the phasor operating current.

    GENERATOR LOSS-OF-FIELD PROTECTION
    3.
    发明申请
    GENERATOR LOSS-OF-FIELD PROTECTION 审中-公开

    公开(公告)号：US20200076338A1

    公开(公告)日：2020-03-05

    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 ,  H02H7/06 ,  H02P29/40 ,  G01R31/34

    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 routing sampled values upon loss of primary measurement equipment
    4.
    发明授权
    Systems and methods for routing sampled values upon loss of primary measurement equipment 有权

    公开(公告)号：US10379991B2

    公开(公告)日：2019-08-13

    申请号：US15711898

    申请日：2017-09-21

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Qiaoyin Yang ,  Normann Fischer

    IPC: G06F11/34 ,  H04L12/721 ,  H04L12/24 ,  H04L12/707 ,  H04L12/26

    Abstract: Systems and Methods are disclosed for providing measurement data redundancy to intelligent electronic devices (IEDs) in an electric power system, without additional redundant components. In various embodiments, a first measurement device obtains measurement data from a first portion of the electric power delivery system. A second measurement device obtains measurement data from a second portion of the electric power delivery system. A first IED monitors the first portion of the electric power delivery system based on measurement data associated with the first portion of the electric power delivery system, and a second IED monitors the second portion of the electric power delivery system based on measurement data associated with the second portion of the electric power delivery system. Assuming the first and second portions are coordinated, a communication system dynamically routes measurement data from the second measurement device to the first IED upon a failure of receiving digital measurements from the first measurement device.

    SYSTEMS AND METHODS FOR MONITORING AND PROTECTING AN ELECTRIC POWER GENERATOR
    5.
    发明申请
    SYSTEMS AND METHODS FOR MONITORING AND PROTECTING AN ELECTRIC POWER GENERATOR 审中-公开
    用于监测和保护电力发电机的系统和方法

    公开(公告)号：US20160025811A1

    公开(公告)日：2016-01-28

    申请号：US14807339

    申请日：2015-07-23

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Bogdan Z. Kasztenny ,  Normann Fischer ,  Dale S. Finney ,  Douglas I. Taylor

    IPC: G01R31/34 ,  H02H7/06

    CPC classification number: G01R31/343 ,  H02H3/083 ,  H02H7/06

    Abstract: Protection of an electrical generator includes determining a rotor and stator components using rotor and stator electrical signals, calculating a unbalance and/or differential component using the stator and rotor components, and determining a stator or rotor fault based on the unbalance and/or differential component. Further, the faulted phase and/or zone of a stator fault may be determined using the stator positive sequence voltage and negative sequence current.

    Abstract translation: 发电机的保护包括使用转子和定子电信号确定转子和定子部件，使用定子和转子部件计算不平衡和/或差动部件，以及基于不平衡和/或差动部件确定定子或转子故障 。 此外，可以使用定子正序电压和负序电流来确定定子故障的故障相位和/或区域。

    HIGH-IMPEDANCE FAULT DETECTION USING WIRELESS CURRENT TRANSFORMERS
    6.
    发明申请
    HIGH-IMPEDANCE FAULT DETECTION USING WIRELESS CURRENT TRANSFORMERS 有权

    公开(公告)号：US20210109147A1

    公开(公告)日：2021-04-15

    申请号：US16688168

    申请日：2019-11-19

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Normann Fischer ,  Raymond W. Rice ,  Ravindra P. Mulpuri ,  James Mobley

    IPC: G01R31/02 ,  G01R31/3185

    Abstract: The present disclosure pertains to systems and methods for monitoring and protecting an electric power system. In one embodiment, a system may comprise line-mounted wireless current transformers to measure at least one parameter of an alternating current (AC), receive a synchronization signal at which to measure the AC, and send a message comprising the measured AC. The system may also comprise an intelligent electronic device (IED) to send the synchronization signal to and receive the messages from the line-mount wireless current transformers, determine whether a high-impedance fault (HiZ) exists between the line-mounted wireless current transformers, and implement a control action based on the existence of the HiZ fault.

    Detection of cross-country faults
    8.
    发明授权
    Detection of cross-country faults 有权

    公开(公告)号：US10474142B2

    公开(公告)日：2019-11-12

    申请号：US15718145

    申请日：2017-09-28

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Dennis Haes ,  Normann Fischer

    IPC: H02H7/00 ,  G05B23/02 ,  H02H1/00 ,  G01R19/25 ,  G01R31/02

    Abstract: Disclosed herein are a variety of systems and methods related to detection of a cross-country fault in an electrical power system. In one embodiment, a system consistent with the present disclosure may be configured to monitor electrical parameters in the electrical power system. The system may determine when a voltage magnitude of one phase exceeds a first voltage threshold. The one phase that exceeds the first voltage threshold may be identified as an un-faulted phase. The system may further be configured to determine that the voltage magnitude of the un-faulted phase exceeds a second threshold based on a zero-sequence voltage. The system may further be configured to determine that a phase angle between the un-faulted phase and the zero-sequence voltage is within a range. A protective action to clear the cross-country fault condition may be implemented upon identification of a cross-country fault.

    DETECTION OF CROSS-COUNTRY FAULTS
    10.
    发明申请
    DETECTION OF CROSS-COUNTRY FAULTS 审中-公开

    公开(公告)号：US20190094845A1

    公开(公告)日：2019-03-28

    申请号：US15718145

    申请日：2017-09-28

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Dennis Haes ,  Normann Fischer

    IPC: G05B23/02 ,  G01R31/02 ,  G01R19/25 ,  H02H1/00

    Abstract: Disclosed herein are a variety of systems and methods related to detection of a cross-country fault in an electrical power system. In one embodiment, a system consistent with the present disclosure may be configured to monitor electrical parameters in the electrical power system. The system may determine when a voltage magnitude of one phase exceeds a first voltage threshold. The one phase that exceeds the first voltage threshold may be identified as an un-faulted phase. The system may further be configured to determine that the voltage magnitude of the un-faulted phase exceeds a second threshold based on a zero-sequence voltage. The system may further be configured to determine that a phase angle between the un-faulted phase and the zero-sequence voltage is within a range. A protective action to clear the cross-country fault condition may be implemented upon identification of a cross-country fault.

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