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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：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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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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Patent Agency Ranking
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：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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公开(公告)号：US11177645B2
公开(公告)日：2021-11-16
申请号：US16692074
申请日：2019-11-22
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Matchyaraju Alla , Vinod K. Yedidi , Jakov Vico , Wasif Ahmad
Abstract: A transformer system including a transformer including a set of wye windings, a three-phase current transformer, a neutral-current transformer, and a controller. The three-phase current transformer outputs a first signal indicative of a three-phase current conducting through the set of wye windings and the three-phase current transformer. The neutral-current transformer couples the current flowing from the ground to the neutral node of the transformer, and outputs a second signal indicative of a neutral current conducting from the ground node to the neutral node of the transformer. The controller receives the first signal and the second signal, determines whether an external ground fault condition or an internal ground fault condition is present based on the three-phase current and the neutral current, and determines whether a wiring error is present for the three-phase current transformer or the neutral-current transformer based on the three-phase current and the neutral current.
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公开(公告)号：US20210159691A1
公开(公告)日：2021-05-27
申请号：US16692074
申请日：2019-11-22
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Ritwik Chowdhury , Matchyaraju Alla , Vinod K. Yedidi , Jakov Vico , Wasif Ahmad
Abstract: A transformer system including a transformer including a set of wye windings, a three-phase current transformer, a neutral-current transformer, and a controller. The three-phase current transformer outputs a first signal indicative of a three-phase current conducting through the set of wye windings and the three-phase current transformer. The neutral-current transformer couples the current flowing from the ground to the neutral node of the transformer, and outputs a second signal indicative of a neutral current conducting from the ground node to the neutral node of the transformer. The controller receives the first signal and the second signal, determines whether an external ground fault condition or an internal ground fault condition is present based on the three-phase current and the neutral current, and determines whether a wiring error is present for the three-phase current transformer or the neutral-current transformer based on the three-phase current and the neutral current.
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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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