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    Accurate modeling of equipment overexcitation damage curves
    1.
    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
    2.
    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.

    SENSITIVE DIRECTIONAL ELEMENT FOR GENERATOR PROTECTION
    5.
    发明申请
    SENSITIVE DIRECTIONAL ELEMENT FOR GENERATOR PROTECTION 审中-公开

    公开(公告)号：US20200067445A1

    公开(公告)日：2020-02-27

    申请号：US16275696

    申请日：2019-02-14

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Ritwik Chowdhury ,  Dale S. Finney

    IPC: H02P29/024 ,  G01R31/34 ,  G01R31/02

    Abstract: Disclosed are systems and methods to determine a direction to a fault of an electrical generator using sensitive current. A ground fault is determined using voltage signals from the generator installation. Incremental residual values of the sensitive current, along with the voltage, are used to determine a direction to the fault. The generator may be high-impedance grounded. The systems and methods further indicate the direction to a fault where multiple generators are connected using a common generation bus.

    Multiple generator ground fault detection
    6.
    发明授权
    Multiple generator ground fault detection 有权

    公开(公告)号：US10333291B2

    公开(公告)日：2019-06-25

    申请号：US16106567

    申请日：2018-08-21

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Ritwik Chowdhury ,  Dale S. Finney

    IPC: H02H7/06 ,  H02H1/00 ,  G01R31/02 ,  G01R31/34

    Abstract: Detection and protection against electric power generator stator ground fault conditions in multiple-generator high-impedance grounded installations is provided herein. In one embodiment, a generator protection element may block a determination of a fault using third harmonic voltages when the third harmonic voltage from the generator is less than a factor of the maximum third harmonic voltage from all of the generators on the common bus. A tripping subsystem may issue a trip command based upon detection of a stator ground fault condition.

    GENERATOR PROTECTION ELEMENT
    8.
    发明申请
    GENERATOR PROTECTION ELEMENT 有权
    发电机保护元件

    公开(公告)号：US20160181790A1

    公开(公告)日：2016-06-23

    申请号：US14579573

    申请日：2014-12-22

    Applicant: Schweitzer Engineering Laboratories, Inc.

    Inventor： Michael J. Thompson ,  Dale S. Finney

    IPC: H02H7/06 ,  F01D15/10 ,  G01R31/34

    CPC classification number: H02H7/06 ,  F01D15/10 ,  F05D2220/76 ,  G01R19/2513 ,  G01R21/001 ,  G01R31/34 ,  G01R31/343

    Abstract: The present disclosure is applicable to generators with low motoring power. In one embodiment, a generator protection element may include a generator monitoring subsystem configured to measure a real power output and an imaginary power output of a generator. The system may also include an electrical parameter threshold subsystem configured to determine whether the measured real power output and the measured imaginary power output satisfy a tripping characteristic. The tripping characteristic may be defined by a function having a slope with respect to a real power axis and an imaginary power axis. In some embodiments, the function may be a piecewise function that defines a first linear segment having a first slope and a second linear segment having a second slope. The first slope and the second slope may be equal and opposite. A tripping subsystem may issue a trip command based upon satisfaction of the tripping characteristic.

    Abstract translation: 本公开适用于具有低电动机功率的发电机。 在一个实施例中，发电机保护元件可以包括被配置为测量发电机的有功功率输出和虚功率输出的发电机监控子系统。 系统还可以包括电参数阈值子系统，其被配置为确定测量的有功功率输出和测量的虚功率输出是否满足跳闸特性。 跳闸特性可以通过相对于实际功率轴和虚拟动力轴具有斜率的函数来定义。 在一些实施例中，该功能可以是限定具有第一斜率的第一线性段和具有第二斜率的第二线性段的分段函数。 第一斜坡和第二斜坡可以相等和相反。 跳闸子系统可以基于跳闸特性的满足来发出跳闸命令。

    BREAKER CONTROL UNITS AND RELATED SYSTEMS AND METHODS
    9.
    发明公开
    BREAKER CONTROL UNITS AND RELATED SYSTEMS AND METHODS 审中-公开

    公开(公告)号：US20240022112A1

    公开(公告)日：2024-01-18

    申请号：US17812041

    申请日：2022-07-12

    Applicant: Schweitzer Engineering Laboratories, Inc.

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

    IPC: H02J13/00 ,  H02B1/30 ,  H02H1/00

    CPC classification number: H02J13/00036 ,  H02B1/30 ,  H02J13/00002 ,  H02H1/0061

    Abstract: Breaker control units (BCUs) may include an output to selectively cause a circuit breaker (CB) to open and close a circuit, a voltage input to monitor a voltage of at least one of a bus and a line, a processor to calculate a point-on-wave switching time, and a remote input configured to be coupled to a remote intelligent electronic device (IED) to receive commands to selectively open and close the CB at a specified optimal time. Electric power systems may include such BCUs. Methods of switching CBs may include monitoring at least one of a bus and a line with a BCU and controlling switching of the CB at a predetermined point-on-wave value with onboard electronics of the BCU. The methods may additionally include calculating a trapped charge and/or a residual flux with an IED and causing the BCU to switch the CB at a specific optimum point-on-wave value.

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