Patents by Inventor Yajian Tong

Yajian Tong 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).

  • Incremental quantities-based fault locating technique and system
    Patent number: 11650241
    Abstract: A technique and a system are used to analyze incremental quantities. The instantaneous electrical measurements associated with a loop in a multiple-phase electric power delivery system are obtained before a fault occurred on the loop and after the same fault occurred on the same loop, and differences between the instantaneous electrical measurements at different times are used to determine incremental quantities, which are used to determine a location of the fault on the loop. Multiple loops in the multiple-phase electric power delivery system are monitored to determine corresponding fault locations on each loop.
    Type: Grant
    Filed: June 28, 2022
    Date of Patent: May 16, 2023
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Gandhali P Juvekar, Yajian Tong
  • Electric power fault protection device using single-ended traveling wave fault location estimation
    Patent number: 10585133
    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: Grant
    Filed: March 19, 2019
    Date of Patent: March 10, 2020
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Armando Guzman-Casillas, Yajian Tong, Mangapathirao Venkata Mynam, Bogdan Z. Kasztenny
  • ELECTRIC POWER FAULT PROTECTION DEVICE USING SINGLE-ENDED TRAVELING WAVE FAULT LOCATION ESTIMATION
    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
  • Traveling wave based single end fault location
    Patent number: 10302690
    Abstract: Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.
    Type: Grant
    Filed: January 31, 2018
    Date of Patent: May 28, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Armando Guzman-Casillas, Bogdan Z. Kasztenny, Yajian Tong, Mangapathirao Venkata Mynam
  • Traveling wave based single end fault location
    Patent number: 10295585
    Abstract: Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.
    Type: Grant
    Filed: November 8, 2017
    Date of Patent: May 21, 2019
    Assignee: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Armando Guzman-Casillas, Bogdan Z. Kasztenny, Yajian Tong, Mangapathirao Venkata Mynam
  • TRAVELING WAVE BASED SINGLE END FAULT LOCATION
    Publication number: 20180196100
    Abstract: Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.
    Type: Application
    Filed: January 31, 2018
    Publication date: July 12, 2018
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Armando Guzman-Casillas, Bogdan Z. Kasztenny, Yajian Tong, Mangapathirao Venkata Mynam
  • TRAVELING WAVE BASED SINGLE END FAULT LOCATION
    Publication number: 20180136269
    Abstract: Traveling wave information from a single end of an electric power delivery system is used to determine a fault location on a power line of the electric power delivery system. Hypotheses of which of a plurality of received traveling waves represents a first reflection from the fault are evaluated. A determination of an arrival time of the first reflection from the fault is used to calculate a distance from the single end of the power line to the fault location.
    Type: Application
    Filed: November 8, 2017
    Publication date: May 17, 2018
    Applicant: Schweitzer Engineering Laboratories, Inc.
    Inventors: Edmund O. Schweitzer, III, Armando Guzman-Casillas, Bogdan Z. Kasztenny, Yajian Tong, Mangapathirao Venkata Mynam