Patents by Inventor Gajendiran BALAKRISHNAN

Gajendiran BALAKRISHNAN 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).

  • Patent number: 11073547
    Abstract: The technology described herein is generally directed to a method of locating a fault in a multi-terminal electrical power transmission scheme, such as implemented in a power transmission scheme where each of six terminals is connected with one of four junctions via a power transmission section and each junction interconnects a plurality of power transmission sections. Aspects of the described technology can be directed to measuring the voltage and current at each terminal, calculating from the measured voltage and current at each terminal corresponding voltage and current phasors, determining from the calculated voltage and current phasors a synchronization difference between the measured voltage and current at a designated terminal and the measured voltage and current at each other terminal, modifying the calculated voltage and current phasors to compensate for each synchronization difference, and determining from the compensated voltage and current phasors the location of the fault.
    Type: Grant
    Filed: November 3, 2017
    Date of Patent: July 27, 2021
    Assignee: GENERAL ELECTRIC TECHNOLOGY GMBH
    Inventors: Hengxu Ha, Sankara Subramanian Sri Gopala Krishna Murthi, Gajendiran Balakrishnan
  • Patent number: 11011335
    Abstract: A trip apparatus for a circuit interruption device that comprises a coil operatively connectable to a circuit interruption device. The coil is configured to selectively operate the circuit interruption device to interrupt when a current flowing through the circuit interruption device exceeds a threshold. The trip apparatus also includes a current measuring device configured to selectively measure a coil current flowing through the coil to determine a measured coil current signal. In addition, the trip apparatus includes a monitoring device configured to determine the derivative of the measured coil current signal and to perform a correlation of the derivative of the measured coil current signal and a reference derivative of a reference coil current signal to determine a correlation output. The monitoring device is further configured to compare the correlation output with a reference correlation threshold to determine whether an operating condition of the coil is normal or abnormal.
    Type: Grant
    Filed: December 10, 2015
    Date of Patent: May 18, 2021
    Assignee: General Electric Technology GmbH
    Inventors: Yang Xia, Yongyue Ma, Brian Kirby, Gajendiran Balakrishnan, Hengxu Ha, Sankara Subramanian Srigopalakrishnamurthi
  • Patent number: 10916932
    Abstract: A method of protecting a power transformer including: monitoring an external fault indication signal; carrying out locally a fault determination; carrying out locally an inrush current determination; and issuing a final trip signal to protect the power transformer if the external fault indication signal identifies that a fault has occurred and the locally carried out fault determination confirms that a fault has occurred; or the external fault indication signal identifies that a fault has occurred and the locally carried out fault determination identifies that no fault has occurred but after a predetermined delay the locally carried out inrush current determination confirms the absence of an inrush current.
    Type: Grant
    Filed: October 12, 2016
    Date of Patent: February 9, 2021
    Assignee: General Electric Technology GmbH
    Inventors: Hengxu Ha, Yu Weng, Gajendiran Balakrishnan
  • Publication number: 20190331726
    Abstract: Embodiments of the disclosure relate to systems and methods of locating a fault in a multi-terminal power transmission scheme. According to at least embodiment of the disclosure there is provided a method of locating a fault in a multi-terminal electrical power transmission scheme in which each terminal is connected with a junction via a power transmission section and the or each junction interconnects a plurality of power transmission sections.
    Type: Application
    Filed: November 3, 2017
    Publication date: October 31, 2019
    Inventors: HENGXU HA, SANKARA SUBRAMANIAN SRI GOPALA KRISHNA MURTHI, GAJENDIRAN BALAKRISHNAN
  • Publication number: 20180294640
    Abstract: A method of protecting a power transformer including: monitoring an external fault indication signal; carrying out locally a fault determination; carrying out locally an inrush current determination; and issuing a final trip signal to protect the power transformer if the external fault indication signal identifies that a fault has occurred and the locally carried out fault determination confirms that a fault has occurred; or the external fault indication signal identifies that a fault has occurred and the locally carried out fault determination identifies that no fault has occurred but after a predetermined delay the locally carried out inrush current determination confirms the absence of an inrush current.
    Type: Application
    Filed: October 12, 2017
    Publication date: October 11, 2018
    Inventors: Hengxu HA, Yu WENG, Gajendiran BALAKRISHNAN
  • Publication number: 20170345598
    Abstract: A trip apparatus for a circuit interruption device that comprises a coil operatively connectable to a circuit interruption device. The coil is configured to selectively operate the circuit interruption device to interrupt when a current flowing through the circuit interruption device exceeds a threshold. The trip apparatus also includes a current measuring device configured to selectively measure a coil current flowing through the coil to determine a measured coil current signal. In addition, the trip apparatus includes a monitoring device configured to determine the derivative of the measured coil current signal and to perform a correlation of the derivative of the measured coil current signal and a reference derivative of a reference coil current signal to determine a correlation output. The monitoring device is further configured to compare the correlation output with a reference correlation threshold to determine whether an operating condition of the coil is normal or abnormal.
    Type: Application
    Filed: December 10, 2015
    Publication date: November 30, 2017
    Inventors: Xia YANG, Yongyue MA, Brian KIRBY, Gajendiran BALAKRISHNAN, Hengsxu HA, Sankara Subramanian SRI GOPALA KRISHNA MURTHI