Patents Assigned to Schweitzer Engineering Laboratories, Inc.
  • Publication number: 20190252134
    Abstract: An intelligent electronic device (IED) may provide point on wave switching. The IED may receive a control operation request, and determine when to issue a control command to cause a switch to change positions. The actuation of the switch may occur at a target point on an alternating current. An IED may have a processor that is too slow to implement a switch when a desired point on an alternating current first occurs. Accordingly, some embodiments may compensate for the processing speed of an IED by determining a number of processor cycles needed (in advance) to issue a control command so that the resulting action results in the desired point on wave open or close.
    Type: Application
    Filed: February 14, 2018
    Publication date: August 15, 2019
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventor: Dennis Haes
  • Publication number: 20190252883
    Abstract: The present disclosure describes load shedding management systems and methods. A load shedding management system may simulate multiple load shedding actions. Based on the simulations the load shedding management system may select a load shedding action. The load shedding management system may send a signal to trip a set of breakers to implement the load shedding action.
    Type: Application
    Filed: February 9, 2018
    Publication date: August 15, 2019
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Krishnanjan Gubba Ravikumar, Scott M. Manson, Benjamin E. Armstrong
  • Publication number: 20190252886
    Abstract: The present disclosure provides systems and methods for managing an electric power delivery system. The systems and methods may limit generated power of the power delivery system from surpassing a load demand, in order to avoid system instability. The systems and methods may receive an excess generation value and manage generators to runback and/or shed to maintain excess generation below a threshold. The systems and methods may determine a plurality of generator groups for runback. The runback capacity of the generators may be compared against the excess generation. If the excess generation is not greater than the runback capacity, the systems and methods may select generator groups until the runback capacity of the selected groups is greater than the excess generation, and may runback those generators according to runback set points. The unselected generators may continue normal operation to be available for another runback request.
    Type: Application
    Filed: February 9, 2018
    Publication date: August 15, 2019
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Krishnanjan Gubba Ravikumar, Benjamin E. Armstrong, Maaz Syed Muhammad Kazmi
  • Patent number: 10381835
    Abstract: The present disclosure provides systems and methods for managing an electric power delivery system. The systems and methods may limit generated power of the power delivery system from surpassing a load demand, in order to avoid system instability. The systems and methods may receive an excess generation value and manage generators to runback and/or shed to maintain excess generation below a threshold. The systems and methods may determine a plurality of generator groups for runback. The runback capacity of the generators may be compared against the excess generation. If the excess generation is not greater than the runback capacity, the systems and methods may select generator groups until the runback capacity of the selected groups is greater than the excess generation, and may runback those generators according to runback set points. The unselected generators may continue normal operation to be available for another runback request.
    Type: Grant
    Filed: February 9, 2018
    Date of Patent: August 13, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Krishnanjan Gubba Ravikumar, Benjamin E. Armstrong, Maaz Syed Muhammad Kazmi
  • Patent number: 10379500
    Abstract: Systems and methods for detecting the failure of a precision time source using an independent time source are disclosed. Additionally, detecting the failure of a GNSS based precision time source based on a calculated location of a GNSS receiver is disclosed. Moreover, the system may be further configured to distribute a time derived from the precision time source as a precision time reference to time dependent devices. In the event of a failure of the precision time source, the system may be configured to distribute a time derived from a second precision time source as the precision time signal during a holdover period.
    Type: Grant
    Filed: August 22, 2017
    Date of Patent: August 13, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Shankar V. Achanta, David E. Whitehead, Henry Loehner
  • Patent number: 10379991
    Abstract: Systems and Methods are disclosed for providing measurement data redundancy to intelligent electronic devices (IEDs) in an electric power system, without additional redundant components. In various embodiments, a first measurement device obtains measurement data from a first portion of the electric power delivery system. A second measurement device obtains measurement data from a second portion of the electric power delivery system. A first IED monitors the first portion of the electric power delivery system based on measurement data associated with the first portion of the electric power delivery system, and a second IED monitors the second portion of the electric power delivery system based on measurement data associated with the second portion of the electric power delivery system.
    Type: Grant
    Filed: September 21, 2017
    Date of Patent: August 13, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Qiaoyin Yang, Normann Fischer
  • Patent number: 10380815
    Abstract: Systems and methods are disclosed that provide for managing transient assets used in connection with an access-controlled area of a distribution site of an electric power delivery system. In some embodiments, one or more users entering and access-controlled area may be identified via physical access control credentials provided to an associated access control system. Transient assets brought within an access-controlled area may be detected via one or more wired and/or wireless communication channels and may be associated with the one or more identified users located within the access-controlled area.
    Type: Grant
    Filed: April 19, 2017
    Date of Patent: August 13, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Kylan T. Robinson, Rhett Smith, George W. Masters, Ryan Bradetich
  • Patent number: 10375108
    Abstract: This disclosure relates to detecting manipulation or spoofing of a time based on a latency of a communication system. In one embodiment, a system includes a time input to receive a time signal. The system includes a first interface to receive a first representation of a first condition at a first location at a first time and a second interface to receive a second representation of a second condition at a second location and at the first time. A latency determination subsystem may determine a latency based on a comparison of the time of arrival of the second measurement and the first time. A threshold subsystem may generate an indication of whether the latency satisfies a threshold. An anomalous condition subsystem may identify an anomalous condition based on the indication, and a remedial action may be implemented based on the anomalous condition.
    Type: Grant
    Filed: December 29, 2016
    Date of Patent: August 6, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Cody W. Tews, David E. Whitehead
  • Patent number: 10368147
    Abstract: The present disclosure relates to a service availability monitor for interfacing with a monitored service, determine an availability of the monitored service, log the availability of the monitored service, generate a user notification in event of interruption, and communicate the user notification. The service availability monitor may include a primary power subsystem configured to draw power from a primary power source, and a backup power subsystem configured to draw power from the primary power subsystem and provide power to the monitor when power is unavailable through the primary power subsystem. The service availability monitor may monitor an electrical power service, an Internet service a telephone service, a television service, or the like.
    Type: Grant
    Filed: February 15, 2017
    Date of Patent: July 30, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Edmund O. Schweitzer, III
  • Publication number: 20190212382
    Abstract: A single-ended traveling wave fault location estimation is calculated using this disclosure, and a confidence level is determined based on available independent fault location estimations. Hypothesis are calculated based on traveling wave times and values, wherein the values indicate a polarity that is the same as the first received traveling wave. Hypothesis are then compared against results of other fault location estimations, and confidence levels assigned accordingly. The fault location is then calculated and displayed based on the hypothesis and confidence levels.
    Type: Application
    Filed: March 19, 2019
    Publication date: July 11, 2019
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Armando Guzman-Casillas, Yajian Tong, Mangapathirao Venkata Mynam, Bogdan Z. Kasztenny
  • Patent number: 10345363
    Abstract: The present disclosure pertains to systems and methods for detecting traveling waves in electric power delivery systems. In one embodiment, a system comprises a capacitance-coupled voltage transformer (CCVT) in an electric power delivery system, the CCVT comprising a first capacitor disposed between an electrical bus and a first electrical node, and a second capacitor electrically disposed between the first electrical node and a ground connection. A resistive divider in electrical communication with a first node may generate a resistive divider electrical signal corresponding to a voltage value. An intelligent electronic device (IED) in electrical communication with the resistive divider monitors a resistive divider voltage signal. The IED detects a traveling wave based on the resistive divider voltage signal and a measurement of a primary current through an electrical bus in electrical communication with the CCVT; and analyzes the traveling wave to detect a fault on the electric power delivery system.
    Type: Grant
    Filed: September 24, 2018
    Date of Patent: July 9, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Veselin Skendzic
  • Publication number: 20190207694
    Abstract: The present disclosure pertains to systems and methods for publishing time-synchronized information. In one embodiment, a system may include a time interface configured to receive a common time signal and a network interface configured to transmit a plurality of data packets using a network. A publishing subsystem may be configured to cause the system to publish at least one data value according to a schedule and the common time signal. A processing sequence number subsystem may be configured to generate a processing sequence number to be included in the plurality of data packets and to reset the processing sequence number at a fixed interval based on the common time signal. A data packet subsystem may be configured to generate a plurality of data packets comprising a respective processing sequence number and the at least one data value.
    Type: Application
    Filed: March 6, 2019
    Publication date: July 4, 2019
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: David J. Dolezilek, Jorge Fernando Calero, Amandeep Singh Kalra, Brian T. Waldron
  • Patent number: 10341311
    Abstract: The present disclosure pertains to systems and methods for selectively encrypting data flows within a software defined network (SDN). In one embodiment, a communication device may be configured to receive a plurality of unencrypted data packets. The communication device may receive from an SDN controller a criterion used to identify at least one of the unencrypted data flows to be encrypted. Based on the criterion, an encryption subsystem may generate an encrypted data flow the unencrypted data packets based on an encryption key. In some embodiments, the encryption system may parse the packets and encrypt the data payloads without encrypting the routing information associated with the packet. In other embodiments, the encryption subsystem may be configured to encapsulate and encrypt the entire unencrypted data packet. In some embodiments, the encryption subsystem may further be configured to authenticate a sending device and/or to verify the integrity of a message.
    Type: Grant
    Filed: July 20, 2015
    Date of Patent: July 2, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Rhett Smith, Barry Jakob Grussling
  • Patent number: 10338108
    Abstract: The present disclosure relates to systems and methods of locking a faulted circuit indicator (FCI). For example, the FCI may include a locking assembly. The locking assembly may include a lock plate that selectively moves between a locked position and an unlocked position. When in the locked position, the lock plate blocks a lock link of the FCI from moving in a first direction to prevent the FCI from opening. When in an unlocked position, the lock plate enables the lock link of the FCI to move in the first direction to allow the FCI to open.
    Type: Grant
    Filed: March 7, 2018
    Date of Patent: July 2, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Eric Ryan, Mark A. Thomas, Mark F. Witczak
  • Publication number: 20190195918
    Abstract: The present disclosure pertains to systems and methods for detecting traveling waves in electric power delivery systems. In one embodiment, a system comprises a capacitance-coupled voltage transformer (CCVT) in electrical communication with the electric power delivery system, the CCVT comprising a stack of capacitors and an electrical contact to a first ground connection. A current transformer is disposed between the stack of capacitors and the first ground connection. The current transformer provides an electrical signal corresponding to a current associated with the CCVT. An intelligent electronic device (IED) in electrical communication with the first current measurement device generates a voltage signal based on the electrical signal from the current transformer. The IED detects a traveling wave based on the first voltage signal; and analyzes the traveling wave to detect a fault on the electric power delivery system.
    Type: Application
    Filed: September 20, 2018
    Publication date: June 27, 2019
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Bogdan Z. Kasztenny, Veselin Skendzic
  • Patent number: 10333291
    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.
    Type: Grant
    Filed: August 21, 2018
    Date of Patent: June 25, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Ritwik Chowdhury, Dale S. Finney
  • Patent number: 10333312
    Abstract: This disclosure includes various systems and methods for determining an operating stage based on electrical conditions in electric power delivery systems and identifying a control strategy based upon the operating stage. The control strategy may be selected and customized to avoid or to ameliorate stresses in an electric power delivery system while maintaining the stability of electric power delivery systems. Various embodiments consistent with the present disclosure may include a distributed controller configured receive a plurality of indications of electrical conditions from a plurality of control devices in electrical communication with the electrical power delivery system. The distributed controller may determine an operating stage from among a plurality of operating stages based upon the plurality of indications of electrical conditions. The distributed controller may further identify a control strategy based upon the operating stage.
    Type: Grant
    Filed: June 13, 2014
    Date of Patent: June 25, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Gregary C. Zweigle, Ellery A. Blood
  • Patent number: 10333301
    Abstract: Protective IEDs in an electrical power system, such as distributed controllers, may periodically or in real-time communicate updated protection settings to a wide-area controller, such as a coordination controller, that defines and/or implements a remedial action scheme to protect the electrical power system. The wide-area controller may utilize real-time protection setting information from a plurality of protective IEDs to perform dynamic transient model simulations based on (1) the current topology of the power system, (2) real-time measurements from the system, and (3) the updated, real-time protection settings of various IEDs within the system. The results of the updated transient model simulations may be used to dynamically adjust the remedial actions scheme of the wide-area controller.
    Type: Grant
    Filed: May 4, 2017
    Date of Patent: June 25, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Krishnanjan Gubba Ravikumar
  • Publication number: 20190187202
    Abstract: A system for accurately determining a location of a fault in an electric power delivery system using traveling waves by compensating for dispersion of the traveling waves. The dispersion may be calculated based on a preliminary fault location determination, and the arrival times of traveling wave peaks may then be corrected using the calculated dispersion. A compensation to the traveling wave propagation speed may be made using a proportionality factor to correct for traveling wave dispersion. Dispersion correction may be a function of fault type or physical power line conditions.
    Type: Application
    Filed: February 25, 2019
    Publication date: June 20, 2019
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Mangapathirao Venkata Mynam, Armando Guzman-Casillas, Tony J. Lee, Veselin Skendzic, Bogdan Z. Kasztenny, David E. Whitehead
  • Patent number: 10317467
    Abstract: Electrical power machines are monitored and a loss-of-field event is determined thereof using time stamped mechanical conditions and electrical conditions. The mechanical conditions may include rotational position, calculated and time stamped rotational frequency, valve position, temperature, or vibration. The time stamped electrical conditions may include electrical power system frequency, electrical power machine field data, electrical power machine terminal information such as voltage and current, and the like. Electrical and mechanical time-stamped electrical power machine data from different machines that may be local or remote from each other may be compared for monitoring the machines.
    Type: Grant
    Filed: May 12, 2015
    Date of Patent: June 11, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Nicholas C. Seeley, David J. Casebolt, Gregary C. Zweigle