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Patent Agency Ranking
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：US11736051B2
公开(公告)日：2023-08-22
申请号：US17815264
申请日：2022-07-27
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Anushka M. Dissanayake , Pallavi Kulkarni
CPC classification number: H02P25/022 , G01R31/343 , H02P1/46 , H02P1/50 , H02P6/08 , H02P21/34
Abstract: A system to reconfigure a motor from induction mode to synchronous mode at a zero crossing of the field voltage during startup using only stator current signals is described herein. The zero crossing may be detected by asymmetry induced in the stator currents by a current asymmetry inducing module of the motor. The current asymmetry inducing module may include a resistor and diode in series and in parallel with a discharge resistor of the field windings. Asymmetry is induced in the current obtained from the stator, and used to determine a zero crossing of the field voltage. Upon the rotor reaching a startup frequency and the detected zero-crossing of the field voltage, the motor may be reconfigured from induction mode to synchronous mode.
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公开(公告)号：US20240204513A1
公开(公告)日：2024-06-20
申请号：US18538148
申请日：2023-12-13
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Anushka M. Dissanayake , Pallavi Kulkarni , Jay Hartshorn
Abstract: A system for high impedance bus protection that includes a safety module to divert excess current away from a protective element of an intelligent electronic device. The safety module may include a variable resistor and a bypass relay in parallel across secondaries of one or more current transformers. The bypass relay may be configured to close upon detection of excess current through the secondaries to divert the excess current away from the variable resistor and the protective element.
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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：US20230038317A1
公开(公告)日：2023-02-09
申请号：US17815264
申请日：2022-07-27
Applicant: Schweitzer Engineering Laboratories, Inc.
Inventor： Marcos A. Donolo , Anushka M. Dissanayake , Pallavi Kulkarni
IPC: H02P25/022 , H02P21/34 , H02P1/46 , H02P6/08 , G01R31/34
Abstract: A system to reconfigure a motor from induction mode to synchronous mode at a zero crossing of the field voltage during startup using only stator current signals is described herein. The zero crossing may be detected by asymmetry induced in the stator currents by a current asymmetry inducing module of the motor. The current asymmetry inducing module may include a resistor and diode in series and in parallel with a discharge resistor of the field windings. Asymmetry is induced in the current obtained from the stator, and used to determine a zero crossing of the field voltage. Upon the rotor reaching a startup frequency and the detected zero-crossing of the field voltage, the motor may be reconfigured from induction mode to synchronous mode.
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