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公开(公告)号：US11381084B1
公开(公告)日：2022-07-05
申请号：US17494190
申请日：2021-10-05
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn , Veselin Skendzic , Chandrasekaran Swaminathan , Vinod K. Yedidi , Angelo D'Aversa , Hang Li , Subhash C. Patel
Abstract: A method includes receiving electrical measurements of an input signal of a power system. The method includes determining an estimated frequency of the power system using a rate of change of phase of the power system and using zero crossings of the power system. Selection between using the rate of change of phase of the power system and using zero crossings of the power system is based on a comparison between an estimated phase angle and a measured phase angle of the power system.
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公开(公告)号：US20230170685A1
公开(公告)日：2023-06-01
申请号：US18056087
申请日：2022-11-16
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn , Anushka M. Dissanayake , Pallavi Kulkarni , Veselin Skendzic , Vinod K. Yedidi , Subhash C. Patel , Angelo D'Aversa
CPC classification number: H02H7/0455 , G01R15/181
Abstract: Signal transducers in electrical communication with shorted leads of current transformers are used to provide monitoring and protection functions to an electric power delivery system. Differential protection is performed by comparing a predetermined threshold against a voltage signal from series-connected leads of signal transducers in electrical communication with shorted leads of current transformers. The signal transducers may be Rogowski coils. Signal transducers in communication with shorted leads may be used to improve safety and increase performance of the current transformers by decreasing susceptibility to saturation.
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公开(公告)号：US11218103B2
公开(公告)日：2022-01-04
申请号：US17066860
申请日：2020-10-09
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn , Subhash C. Patel , Vinod K. Yedidi , Jianchun Qin
Abstract: An intelligent electronic device (IED) according to the present disclosure can estimate a full load rotor resistance value as a function of motor positive-sequence resistance. The IED may estimate the full load rotor resistance value by measuring zero-crossings of voltage after a motor disconnect. The IED may also acquire motor current and voltage measurements and calculate motor slip using the acquired motor current and voltage measurements and the estimated full load rotor resistance value.
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公开(公告)号：US12244135B2
公开(公告)日：2025-03-04
申请号：US18056087
申请日：2022-11-16
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn , Anushka M. Dissanayake , Pallavi Kulkarni , Veselin Skendzic , Vinod K. Yedidi , Subhash C. Patel , Angelo D'Aversa
Abstract: Signal transducers in electrical communication with shorted leads of current transformers are used to provide monitoring and protection functions to an electric power delivery system. Differential protection is performed by comparing a predetermined threshold against a voltage signal from series-connected leads of signal transducers in electrical communication with shorted leads of current transformers. The signal transducers may be Rogowski coils. Signal transducers in communication with shorted leads may be used to improve safety and increase performance of the current transformers by decreasing susceptibility to saturation.
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Patent Agency Ranking
公开(公告)号：US20160334468A1
公开(公告)日：2016-11-17
申请号：US14710796
申请日：2015-05-13
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Subhash C. Patel , George E. Alexander
IPC: G01R31/34
CPC classification number: G01R31/343 , H02H7/0855
Abstract: Detection of a locked rotor condition of an electric motor during startup herein uses a virtual speed switch. The methods and systems herein determine whether the motor is in a starting state, and the monitor the motor current to determine if it is greater than a predetermined threshold, and that the motor current decrease exceeds a predetermined threshold after a predetermined amount of time. If the decrease in motor current is not less than a predetermined threshold, then a speed switch bit is set, indicating that the rotor is turning. The methods and systems herein further determine whether a physical speed switch is faulty, and determine a locked rotor condition using the virtual speed switch signal, a physical speed switch signal, and whether the physical speed switch is faulty.
Abstract translation: 在启动期间检测电动机的转子转子状态使用虚拟速度开关。 这里的方法和系统确定电动机是否处于起动状态，并且监视电动机电流以确定其是否大于预定阈值，并且在预定时间量之后电动机电流下降超过预定阈值。 如果电动机电流的下降不小于预定阈值，则设定转速开关位，表示转子转动。 这里的方法和系统进一步确定物理速度开关是否有故障，并且使用虚拟速度开关信号，物理速度开关信号以及物理速度开关是否有故障来确定锁定的转子状况。
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公开(公告)号：US20160181966A1
公开(公告)日：2016-06-23
申请号：US15059091
申请日：2016-03-02
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Angelo D'Aversa , Subhash C. Patel , Vinod K. Yedidi , Jianchun Qin
CPC classification number: H02P29/60 , G01R19/175 , G01R19/2513 , G01R31/343 , H02H7/0805
Abstract: Monitoring thermal conditions of an electric motor using current signals from power supplied to the motor is disclosed herein. The current signals may be used to calculate composite current values which may be used to calculate slip. The slip may be used to provide thermal monitoring and protection to the electric motor. Slip may be calculated using only values from the stator of the electric motor for providing thermal monitoring and protection to electric motors where rotor measurements are not available.
Abstract translation: 这里公开了使用供给电动机的电力的电流信号来监视电动机的热条件。 电流信号可用于计算可用于计算滑差的复合电流值。 滑块可用于为电动机提供热监测和保护。 可以仅使用来自电动机的定子的值来计算滑差，以便对没有转子测量的电动机提供热监测和保护。
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公开(公告)号：US20210111653A1
公开(公告)日：2021-04-15
申请号：US17066860
申请日：2020-10-09
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Jay Hartshorn , Subhash C. Patel , Vinod K. Yedidi , Jianchun Qin
Abstract: An intelligent electronic device (IED) according to the present disclosure can estimate a full load rotor resistance value as a function of motor positive-sequence resistance. The IED may estimate the full load rotor resistance value by measuring zero-crossings of voltage after a motor disconnect. The IED may also acquire motor current and voltage measurements and calculate motor slip using the acquired motor current and voltage measurements and the estimated full load rotor resistance value.
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公开(公告)号：US09939492B2
公开(公告)日：2018-04-10
申请号：US14710796
申请日：2015-05-13
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Subhash C. Patel , George E. Alexander
CPC classification number: G01R31/343 , H02H7/0855
Abstract: Detection of a locked rotor condition of an electric motor during startup herein uses a virtual speed switch. The methods and systems herein determine whether the motor is in a starting state, and the monitor the motor current to determine if it is greater than a predetermined threshold, and that the motor current decrease exceeds a predetermined threshold after a predetermined amount of time. If the decrease in motor current is not less than a predetermined threshold, then a speed switch bit is set, indicating that the rotor is turning. The methods and systems herein further determine whether a physical speed switch is faulty, and determine a locked rotor condition using the virtual speed switch signal, a physical speed switch signal, and whether the physical speed switch is faulty.
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公开(公告)号：US09917545B2
公开(公告)日：2018-03-13
申请号：US15059091
申请日：2016-03-02
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Angelo D'Aversa , Subhash C. Patel , Vinod K. Yedidi , Jianchun Qin
CPC classification number: H02P29/60 , G01R19/175 , G01R19/2513 , G01R31/343 , H02H7/0805
Abstract: Monitoring thermal conditions of an electric motor using current signals from power supplied to the motor is disclosed herein. The current signals may be used to calculate composite current values which may be used to calculate slip. The slip may be used to provide thermal monitoring and protection to the electric motor. Slip may be calculated using only values from the stator of the electric motor for providing thermal monitoring and protection to electric motors where rotor measurements are not available.
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