Patents by Inventor Gregary C. Zweigle
Gregary C. Zweigle has filed for patents to protect the following inventions. This listing includes patent applications that are pending as well as patents that have already been granted by the United States Patent and Trademark Office (USPTO).
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Publication number: 20140244058Abstract: Disclosed is state trajectory prediction in an electric power delivery system. Electric power delivery system information is calculated from measurements by intelligent electronic devices (IEDs), and communicated to a state trajectory prediction system. The state trajectory prediction system may be configured to generate a load prediction profile. The load prediction profile may provide a predicted response of a load at a future time. Further, the state trajectory prediction system may be configured to generate a generator prediction profile that provides a predicted response of a generator at a future time. The state trajectory prediction system may generate a state trajectory prediction based, at least in part, on the load prediction profile and the generator prediction profile. The state trajectory prediction may represent a future state of the electric power delivery system.Type: ApplicationFiled: February 26, 2014Publication date: August 28, 2014Applicant: Schweitzer Engineering Laboratories, Inc.Inventors: Gregary C. Zweigle, Eric J. Hewitt, Ellery A. Blood
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Publication number: 20140111377Abstract: Disclosed herein is a system for detecting manipulation of a global time source such as a Global Navigational Satellite System (GNSS) signal and mitigating against such manipulation. A plurality of receivers with geographical diversity receive GNSS signals, and calculate a time signal to be distributed to consuming devices. The receivers also communicate calculated time signals with other receivers. The receivers compare the time signals, and when a difference between the time signals exceeds a predetermined threshold, the receivers indicate that manipulation is likely. Such indication is shared across the network of receivers. The indication is further shared with consuming devices of the time signal from the compromised receiver. A second time signal that is not compromised may be shared with the consuming devices and/or used by the consuming devices. The consuming devices may modify their behavior when in receipt of the indication.Type: ApplicationFiled: May 17, 2013Publication date: April 24, 2014Applicant: Schweitzer Engineering Laboratories, Inc.Inventors: Shankar V. Achanta, Gregary C. Zweigle, Christopher R. Huntley
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Publication number: 20140100702Abstract: Distributed controllers in an electric power delivery system obtain measurements and equipment status, calculate derived values, and determine IED state, and share such with other distributed controllers and coordination controllers. Distributed controllers and coordination controllers further refine measurements, equipment status, derived values, and IED state. Control of the electric power delivery system is coordinated among the distributed controllers and the coordination controllers.Type: ApplicationFiled: March 14, 2013Publication date: April 10, 2014Applicant: Schweitzer Engineering Laboratories, Inc.Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle
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Patent number: 8682496Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: GrantFiled: August 23, 2012Date of Patent: March 25, 2014Assignee: Schweitzer Engineering Laboratories IncInventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Publication number: 20130346419Abstract: The present disclosure relates to searching electric power system waveforms. Disclosed herein are various systems and methods for improving search performance through indexing electric power system waveforms using waveform attributes such as frequency, amplitude, angle, rate of change, and the like. According to some embodiments, multiple indexes may be used together to find information of interest. A reference signal may be utilized according to some embodiments. Normalizing a plurality of waveforms using a reference signal may facilitate the use of an index for comparing two arbitrary waveforms. This disclosure also relates to detecting and indexing islanding conditions in an electric power system. Various embodiments may utilize information relating to islanding conditions in connection with search operations.Type: ApplicationFiled: March 12, 2013Publication date: December 26, 2013Applicant: SCHWEITZER ENGINEERING LABORATORIES, INC.Inventors: Eric J. Hewitt, Gregary C. Zweigle, Stanley P. Gotshall
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Patent number: 8494795Abstract: An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to a common time standard in an electrical power system. The method includes acquiring and determining a frequency of a power system signal, sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form signal samples, and generating a plurality of acquisition time values based on an occurrence of each of the signal samples at a corresponding plurality of different times referenced to the common time standard. The method further includes adjusting a phasor of each of the signal samples based on a time difference between a corresponding selected acquisition time value and a predetermined time referenced to a common time standard to form the plurality of synchronized phasors.Type: GrantFiled: December 8, 2010Date of Patent: July 23, 2013Assignee: Schweitzer Engineering Laboratories IncInventors: Gregary C. Zweigle, Armando Guzman-Casillas, Luther S. Anderson
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Publication number: 20120323397Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: ApplicationFiled: August 23, 2012Publication date: December 20, 2012Applicant: Schweitzer Engineering Laboratories, Inc.Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Patent number: 8275485Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: GrantFiled: August 10, 2010Date of Patent: September 25, 2012Assignee: Schweitzer Engineering Laboratories, Inc.Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Patent number: 8275487Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: GrantFiled: August 10, 2010Date of Patent: September 25, 2012Assignee: Schweitzer Engineering Laboratories, Inc.Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Patent number: 8275486Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: GrantFiled: August 10, 2010Date of Patent: September 25, 2012Assignee: Schweitzer Engineering Laboratories, Inc.Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Publication number: 20110077885Abstract: An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to a common time standard in an electrical power system. The method includes acquiring and determining a frequency of a power system signal, sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form signal samples, and generating a plurality of acquisition time values based on an occurrence of each of the signal samples at a corresponding plurality of different times referenced to the common time standard. The method further includes adjusting a phasor of each of the signal samples based on a time difference between a corresponding selected acquisition time value and a predetermined time referenced to a common time standard to form the plurality of synchronized phasors.Type: ApplicationFiled: December 8, 2010Publication date: March 31, 2011Inventors: Gregary C. Zweigle, Armando Guzman-Casillas, Luther S. Anderson
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Publication number: 20110035076Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: ApplicationFiled: August 10, 2010Publication date: February 10, 2011Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Publication number: 20110035065Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: ApplicationFiled: August 10, 2010Publication date: February 10, 2011Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Publication number: 20110035066Abstract: A system for controlling and automating an electric power delivery system by executing time coordinated instruction sets to achieve a desired result. A communication master may implement the execution of time coordinated instruction sets in a variety of circumstances. The communication may be embodied as an automation controller in communication with intelligent electronic devices (IEDs). The communication master may also be embodied as an IED that is configured to coordinate the actions of other IEDs. The time coordinated instruction sets may include steps for checking status of power system equipment before executing. The time coordinated instruction sets may include reactionary steps to execute if one of the steps fails. The time coordinated instruction sets may also be implemented based on a condition detected in the electric power delivery system, or may be implemented through high level systems, such as a SCADA system or a wide area control and situational awareness system.Type: ApplicationFiled: August 10, 2010Publication date: February 10, 2011Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Gregary C. Zweigle, Normann Fischer, Robert E. Morris
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Patent number: 7630863Abstract: An apparatus, system and method in an electrical system using power system information or data associated therewith having a time component associated therewith sampled or obtained from the electrical system at a local and a remote location, wherein the local and remote data are time aligned and used to provide control, monitoring, metering, and/or automation to the electrical system. The local IED may be adapted to receive power system data from the remote IED, time align the local and remote synchronized power system data, and perform math operations on the local and remote power system data.Type: GrantFiled: September 18, 2007Date of Patent: December 8, 2009Assignee: Schweitzer Engineering Laboratories, Inc.Inventors: Gregary C. Zweigle, Armando Guzman-Casillas, Charles E. Petras, Ping Jiang
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Patent number: 7583771Abstract: Systems and methods providing resampling of a sampled data transmitted through a communication channel. Reliable resampling is provided even when original data samples are lost or reordered during transmission through the network. In one embodiment, a receiver associates each received data sample with a respective sampling time instant. The received data may include index values that associate the received data samples with respective sampling time instants. In other embodiments, the received data includes time stamps with encoded sampling time instant information. In another embodiment, arrival time instants are used to correlate the received data samples with their respective sampling time instants. The receiver then uses the sampling time information to select data samples corresponding to resampling time instants. If needed, the receiver uses interpolation to generate resampled data points corresponding to the resampling time instants.Type: GrantFiled: August 21, 2007Date of Patent: September 1, 2009Assignee: Schweitzer Engineering Laboratories, Inc.Inventors: Gregary C. Zweigle, Ian C. Ender
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Patent number: 7480580Abstract: An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system. The method includes acquiring and determining a frequency of a power system signal, sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form signal samples, and generating a plurality of acquisition time values based on an occurrence of each of the signal samples at a corresponding plurality of different times referenced to the absolute time standard. The method further includes adjusting a phasor of each of the signal samples based on a time difference between a corresponding selected acquisition time value and a predetermined time referenced to an absolute time standard to form the plurality of synchronized phasors.Type: GrantFiled: August 15, 2006Date of Patent: January 20, 2009Assignee: Schweitzer Engineering Laboratories, Inc.Inventors: Gregary C. Zweigle, Luther S. Anderson, Armando Guzman-Casillas
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Publication number: 20080281540Abstract: An apparatus and method estimates a plurality of synchronized phasors at predetermined times referenced to an absolute time standard in an electrical power system. The method includes acquiring and determining a frequency of a power system signal, sampling the power system signal at a sampling interval rate based on a frequency of the power system signal to form signal samples, and generating a plurality of acquisition time values based on an occurrence of each of the signal samples at a corresponding plurality of different times referenced to the absolute time standard. The method further includes adjusting a phasor of each of the signal samples based on a time difference between a corresponding selected acquisition time value and a predetermined time referenced to an absolute time standard to form the plurality of synchronized phasors.Type: ApplicationFiled: May 5, 2008Publication date: November 13, 2008Inventors: Gregary C. Zweigle, Luther S. Anderson, Armando Guzman-Casillas
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Patent number: 7398411Abstract: Provided is a self-calibrating time code generator and method for generating an accurate time code (e.g., an accurate IRIG waveform). The self-calibrating time code generator includes a phase-locked loop configured to provide a generated output signal based on a phase difference between an absolute time reference signal and a compensated generated input signal, an IRIG encoder configured to couple a present time value with the generated output signal to form an IRIG waveform, a delay difference indicator configured to provide a time interval value based on a comparison of corresponding pulse edges of the generated output signal and the IRIG waveform, and a numerical delay component configured to delay the generated output signal by the time interval value to form the compensated generated input signal used to time-align the IRIG waveform with the absolute time reference signal to form the accurate IRIG waveform.Type: GrantFiled: May 12, 2005Date of Patent: July 8, 2008Assignee: Schweitzer Engineering Laboratories, Inc.Inventors: Gregary C. Zweigle, Jerry J. Bennett, Shankar V. Achanta
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Publication number: 20080080114Abstract: A line disturbance detector is disclosed which oversees the operation of power protection devices monitoring the same conductor, and only allows a power automation or control operation when both the disturbance detector and a traditional power protection device, such as a protection relay, determine such an operation is required.Type: ApplicationFiled: September 29, 2006Publication date: April 3, 2008Inventors: Edmund O. Schweitzer, Veselin Skendzic, Gregary C. Zweigle, Robert E. Morris, Andrew A. Miller