Patents by Inventor Che Woong Ha

Che Woong Ha 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).

  • Device for detecting open phase of connection line of standby transformer in nuclear power plant by using Rogowski coil
    Patent number: 9714974
    Abstract: Disclosed is a device for detecting an open phase of a connection line of a standby transformer in a nuclear power plant by using a Rogowski coil. A Rogowski coil is provided to a neutral line of a Y connection at the primary side of the standby transformer. An open phase detection unit is provided for determining the generation of an open phase at the primary side and generating a warning signal if a current induced in the Rogowski coil is maintained at a value higher than a preset reference value for a time longer than a preset reference time in a state where a circuit breaker at the secondary side of the standby transformer is open. A main control unit is provided for displaying the warning to an administrator according to the warning signal provided by the open phase detection part.
    Type: Grant
    Filed: September 1, 2014
    Date of Patent: July 25, 2017
    Assignee: KOREA HYDRO & NUCLEAR POWER CO., LTD
    Inventors: Che Woong Ha, Do Hwan Lee
  • DEVICE FOR DETECTING OPEN PHASE OF CONNECTION LINE OF STANDBY TRANSFORMER IN NUCLEAR POWER PLANT BY USING ROGOWSKI COIL
    Publication number: 20160202306
    Abstract: Disclosed is a device for detecting an open phase of a connection line of a standby transformer in a nuclear power plant by using a Rogowski coil. A Rogowski coil is provided to a neutral line of a Y connection at the primary side of the standby transformer. An open phase detection unit is provided for determining the generation of an open phase at the primary side and generating a warning signal if a current induced in the Rogowski coil is maintained at a value higher than a preset reference value for a time longer than a preset reference time in a state where a circuit breaker at the secondary side of the standby transformer is open. A main control unit is provided for displaying the warning to an administrator according to the warning signal provided by the open phase detection part.
    Type: Application
    Filed: September 1, 2014
    Publication date: July 14, 2016
    Inventors: Che Woong Ha, Do Hwan Lee