Patents Assigned to Schweitzer Engineering Laboratories, Inc.
  • Publication number: 20210231723
    Abstract: Line-mounted devices for determining fault magnitude in an electric power delivery system even under current-transformer (CT) saturation are disclosed herein. Fault magnitude is calculated using unsaturated regions of a current waveform captured by the line-mounted device. The method of determining the unsaturated regions is computationally efficient. Fictitious peaks are removed, and the unsaturated regions are determined based on fractions of the valid peaks. Fault current magnitude is calculated using sample values in the unsaturated regions.
    Type: Application
    Filed: January 23, 2020
    Publication date: July 29, 2021
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventor: Kei Hao
  • Publication number: 20210231736
    Abstract: Systems and methods to detect that a protective device is operating outside of a time inverse overcurrent tolerance region are described. For example, a central monitoring station may obtain a time inverse overcurrent tolerance region of a protective device on a power line. The central monitoring station may obtain a fault magnitude measurement and a fault duration measurement of a wireless line sensor on the power line. The central monitoring station may determine that the protective device is operating outside of the tolerance region based at least in part on the fault magnitude measurement and the fault duration measurement. The central monitoring station may provide a signal indicating that there is a potential issue with the protective device.
    Type: Application
    Filed: January 24, 2020
    Publication date: July 29, 2021
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Shankar V. Achanta, Kei Hao
  • Patent number: 11075519
    Abstract: Systems and methods to control a capacitor bank based on the power flow direction are described herein. For example, a capacitor bank controller (CBC) may determine a power flow direction based on one or more current measurements and one or more voltage measurements. The CBC may control the capacitor bank using a first quantity when the power flow direction is in a first direction. The CBC may control the capacitor bank using a second quantity when the power flow direction is in a second direction. The second quantity may be different from the first quantity to account for the relationship between sensors of the CBC with respect to the capacitor bank on the power line.
    Type: Grant
    Filed: October 30, 2019
    Date of Patent: July 27, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Kei Hao, Jeremy William Blair
  • Patent number: 11075908
    Abstract: The present disclosure pertains to systems and methods for improving security and simplifying authentication in a software defined network (“SDN”). In various embodiments, the systems and methods disclosed herein may be applied in operational technology networks, such as those used in electrical power systems. In one embodiment, a device to be authenticated may be in communication with a network device. The network device may receive authentication credentials from the device to be authenticated and may communicate the authentication credentials to an authenticator. The authenticator may assess and approve the authentication credentials and communicate approval of the authentication credentials to the network device. The network device may implement a plurality of communication flows associated with the device to be authenticated.
    Type: Grant
    Filed: May 17, 2019
    Date of Patent: July 27, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Dennis Gammel, James A. Lester
  • Patent number: 11067617
    Abstract: A line-mounted device is used to provide power system signals to a device for detecting a fault and calculating a fault location using a traveling wave launched thereby. Current at the line-mounted device is used to separate incident and reflected traveling waves at a terminal. Times and polarities of traveling waves passing the line-mounted device and the terminal are compared to determine if the fault is located between the terminal and line-mounted device or at a location beyond the terminal or line-mounted device. Voltage of the traveling wave may be calculated using currents from the line-mounted device.
    Type: Grant
    Filed: September 26, 2019
    Date of Patent: July 20, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Raymond W. Rice
  • Patent number: 11068221
    Abstract: Systems and methods are disclosed herein relating to control of one or more components of an electric power system. A human machine interface (HMI) may be utilized to control and monitor a remote intelligent electronic device (IED) via a local intelligent electronic device (IED) connected to the HMI.
    Type: Grant
    Filed: June 8, 2020
    Date of Patent: July 20, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Keith C. Henriksen, Priyanka Nadkar
  • Publication number: 20210218239
    Abstract: Systems and methods to estimate trapped charge for a controlled automatic reclose are described herein. For example, an intelligent electronic device (IED) may calculate an analog amount of trapped charge of each phase of a power line based on voltage measurements of the power line. The IED may close a switching device of each phase at a time corresponding to a point-on-wave associated with the analog amount of trapped charge of the respective phase.
    Type: Application
    Filed: January 14, 2020
    Publication date: July 15, 2021
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Ritwik Chowdhury, Gabriel Benmouyal, Carolyn Sun
  • Patent number: 11064640
    Abstract: The present disclosure relates to a feeder arm for a surface mount technology (SMT) machine. In an embodiment, the feeder arm includes a support body that is fastened to an SMT machine. The feeder arm includes a reel loading body that supports a reel of electrical components to allow the reel to be prepared for installation on the SMT machine. The feeder arm includes preparation circuitry configured to electrically connect the reel to allow the reel to be prepared. The feeder arm includes an articulating joint between the reel loading body and the support body. The articulating joint may articulate the second body between a first position and a second position.
    Type: Grant
    Filed: January 10, 2019
    Date of Patent: July 13, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: John Christian O'Bryan
  • Patent number: 11057021
    Abstract: A fixed latency configurable tap or fixed-tap digital filter may filter a signal in a fixed amount of time, regardless of the number of taps. The filter may include one or more of a clock, a plurality of registers in a shift register, an adder, an accumulator, and/or a scaler. In at least one embodiment, a running average may be maintained as samples are received such that the latency remains fixed with a constant number of clock cycles.
    Type: Grant
    Filed: September 30, 2019
    Date of Patent: July 6, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Srinivas Achanta
  • Patent number: 11056874
    Abstract: An electric power delivery system may be protected upon occurrence of a fault condition by the systems and methods disclosed herein by detecting the fault condition and signaling a protective action before the overcurrent condition reaches the protective equipment. The protective action may be an opening of a circuit breaker or engagement of a fault current limiter. The overcurrent condition may be a non-steady-state condition. The fault may be detected using traveling wave or incremental quantity techniques.
    Type: Grant
    Filed: January 29, 2019
    Date of Patent: July 6, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Bogdan Z. Kasztenny, David E. Whitehead
  • Patent number: 11056082
    Abstract: The present disclosure pertains to systems and methods for generating a waterfall display to display a stream of high-speed data measurements. In one embodiment, a system may comprise a communication subsystem to receive a stream of high-speed data measurements. A waterfall generation subsystem may receive the stream of high-speed data measurements from the communication subsystem and identify a plurality of changes in the stream of high-speed data. A subset of data measurements may be selected that includes changes in the high-speed data. The changes may be highlighted through a plurality of modifications. A representation of the subset of data measurements in which changes are highlighted may be generated and presented at a rate below a perception threshold of a human operator. A waterfall display subsystem may generate a human-perceptible waterfall display to represent the stream of high-speed data measurements and the plurality of modifications.
    Type: Grant
    Filed: September 29, 2020
    Date of Patent: July 6, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, David E. Whitehead, David J. Casebolt, Krishnanjan Gubba Ravikumar, Austin Edward Wade
  • Publication number: 20210203148
    Abstract: The present disclosure relates to systems and methods of sag in a power line. In an embodiment, a monitoring device may include a distance sensor and an operating parameter sensor. A processor of the monitoring device may acquire, via the distance sensor, a first distance measurement. The processor may acquire, via the operating parameter sensor, a first operating parameter measurement. The processor may provide an output signal indicating that the power line is sagging when a combination of the first distance measurement and the first operating parameter measurement exceed a first combined distance-operating parameter threshold.
    Type: Application
    Filed: March 12, 2021
    Publication date: July 1, 2021
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Scott M. Manson, Shankar V. Achanta, Gregary C. Zweigle, Richard M. Edge
  • Patent number: 11050234
    Abstract: Systems and methods for facilitating selected communications among primary protection relays using a supervisory system with a configurable input/output (IO) map. Primary protection relays may obtain signals from equipment associated with an electric power delivery system and provide primary protection without need for communication. The primary protection relays may communicate a unique identifier as well as signal values, states, and commands to the supervisory system. The supervisory system may route specifically identified communications among primary protection relays in accordance with a configurable IO map by transmitting selected portions of the communications on a port associated with the receiving primary protection relay. The primary protection relays may perform secondary protection and other operations using the communicated information.
    Type: Grant
    Filed: March 26, 2020
    Date of Patent: June 29, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, David E. Whitehead, Krishnanjan Gubba Ravikumar, Austin Edward Wade
  • Publication number: 20210194791
    Abstract: Disclosed are systems and methods for path planning in a programmable communications network with multipoint nodes. The multipoint nodes include nodes with multiple connections to the programmable communication network. Path planning determines source multipoint nodes and destination multipoint nodes. Paths are planned to avoid redundant delivery of messages to a single interface of the multipoint nodes. A network controller programs network communications devices with the determined paths. Multipoint nodes may include multipoint devices or traditional tie points.
    Type: Application
    Filed: December 20, 2019
    Publication date: June 24, 2021
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventor: Tristan Lloyd Mullis
  • Patent number: 11043803
    Abstract: The present disclosure relates to generating reference signals for distance and directional elements in power systems. For example, an intelligent electronic device (IED) may receive A-phase, B-phase, and C-phase electrical measurements of a power system. The IED may transform the A-phase, B-phase, and C-phase measurements to a d-component, a q-component, and a 0-component. The IED may include an adaptive notch filter that reduces or eliminates a double frequency component that may be present when step changes of frequency and/or amplitude occur and/or when the A-phase, B-phase, and C-phase measurements have different amplitudes. By reducing the double frequency component, the IED may generate a more accurate ? which may allow for more accurately tracking changes to the polarizing source. Further, the IED may separately add inertia to the estimated angular frequency used in generating a reference signal.
    Type: Grant
    Filed: July 22, 2019
    Date of Patent: June 22, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Bartosz Jan Brusilowicz
  • Publication number: 20210184607
    Abstract: A generator system includes a generator including terminals, a generator circuit breaker coupled to the terminals and that couples and decouples the generator from a power grid, multiple sensors, and a controller that operates the generator system. The controller determines whether an active power is less than a reverse active power threshold and whether one or more turbine valves are closed, and determines that a breaker failure has occurred based on the active power being less than the reverse active power threshold and the one or more turbine valves being closed. If the active power remains less than the reverse active power and the turbine valves remain closed after a threshold time period after the trip command, and if a reactive power is less than a reverse reactive power threshold, then a breaker failure has occurred. In response, the controller may transmit another trip command to the generator circuit breaker to initiate the breaker failure protection.
    Type: Application
    Filed: December 17, 2019
    Publication date: June 17, 2021
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventor: Matchyaraju Alla
  • Patent number: 11035891
    Abstract: Electric power system voltage control and voltage stability may be calculated using energy packets. Sets of negative energy packet sets normalized by a set of positive and negative energy packet sets may be used for voltage control by adding or removing capacitive units. Energy packet voltage indicators may be calculated using energy packets, and used to determine voltage stability. Control actions may be taken depending on the determined voltage stability.
    Type: Grant
    Filed: March 6, 2020
    Date of Patent: June 15, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Gregary C. Zweigle, Ellery A. Blood
  • Patent number: 11038352
    Abstract: Systems and methods described herein may be used to search for a minimum load overshed in a power system. For example, a control system includes memory and a processor operatively coupled to the memory. The processor may obtain an amount of power consumed by each load in a total set of loads in a microgrid. The processor may detect a difference between the amount of power generated and the amount of power consumed. The processor may select a subset of loads to shed from the total set of loads by searching a tree of potential load shed amounts to substantially balance the amount of power generated with the amount of power consumed. The processor may send one or more signals to one or more electronic devices to cause the selected subset of loads to be shed.
    Type: Grant
    Filed: November 26, 2019
    Date of Patent: June 15, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Abdel Rahman Khatib, Niannian Cai
  • Patent number: 11038384
    Abstract: The present application relates to autonomous and/or real-time monitoring of power transmission devices using an unmanned vehicle. The unmanned vehicle may have a modular payload that controls the unmanned vehicle's positioning and orientation. The modular payload may include processing circuitry that controls data acquisition and perform processing of the collected data. Processing of the collected data may include determinations of the type of power transmission device being monitored and/or determinations of the operational status of the power transmission device being monitored. Communication between the autonomous vehicle and/or payload and the power transmission device may be established using radiofrequency data links.
    Type: Grant
    Filed: June 10, 2019
    Date of Patent: June 15, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventor: Johnny G Sim
  • Patent number: 11038342
    Abstract: The present disclosure pertains to systems and methods for analyzing traveling waves in an electric power delivery system. In one embodiment, a system may comprise a traveling wave identification subsystem to receive electric power system signals and identify a plurality of incident, reflected, and transmitted traveling waves. A first traveling wave may be selected from the incident and transmitted traveling waves, and a first distortion may be determined. A second traveling wave subsequent to the first traveling wave, may selected from the incident traveling waves and a second distortion may be determined. A traveling wave analysis subsystem may compare the first distortion and the second distortion and determine whether the first distortion is consistent with the second distortion. A protective action subsystem may implement a protective action based on a first determination that the first distortion is consistent with the second distortion.
    Type: Grant
    Filed: September 20, 2018
    Date of Patent: June 15, 2021
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Bogdan Z. Kasztenny