Patents by Inventor Jeong-Yong Heo

Jeong-Yong Heo 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).

  • Method for detecting fault on transmission lines by using harmonics and state transition diagram
    Patent number: 6944554
    Abstract: Disclosed is a method for detecting a fault by using harmonics and a state transition diagram. When the fault occurs on transmission lines, the fault is detected by using harmonics and the state transition diagram. Two logic signals are outputted by using apparent impedance of a steady state characteristic and a sum of harmonics components of a transient state characteristic. Such two logic signals are used as input parameters of the state transition diagram so that the state of an electric power system is presumed based on a state transition of the electric power system. It is possible to prevent a distance relay from being malfunctioned under an increase of load and unstable voltage. The state of the electric power system is presumed by using harmonics and the state transition diagram, and the fault on the transmission line is reliably detected.
    Type: Grant
    Filed: December 10, 2003
    Date of Patent: September 13, 2005
    Assignee: Sungkyunkwan University
    Inventors: Chul-Hwan Kim, Jeong-Yong Heo
  • Method for detecting fault on transmission lines by using harmonics and state transition diagram
    Publication number: 20050021300
    Abstract: Disclosed is a method for detecting a fault by using harmonics and a state transition diagram. When the fault occurs on transmission lines, the fault is detected by using harmonics and the state transition diagram. Two logic signals are outputted by using apparent impedance of a steady state characteristic and a sum of harmonics components of a transient state characteristic. Such two logic signals are used as input parameters of the state transition diagram so that the state of an electric power system is presumed based on a state transition of the electric power system. It is possible to prevent a distance relay from being malfunctioned under an increase of load and unstable voltage. The state of the electric power system is presumed by using harmonics and the state transition diagram, and the fault on the transmission line is reliably detected.
    Type: Application
    Filed: December 10, 2003
    Publication date: January 27, 2005
    Inventors: Chul-Hwan Kim, Jeong-Yong Heo