Patents by Inventor Jae Sung Yun

Jae Sung Yun 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).

  • Relaying method for protecting a transformer using a difference of current
    Patent number: 6958894
    Abstract: Disclosed is a relaying method for protecting a transformer by using a difference of current. A decision function, related to the rate of change of a primary current, a secondary current, or a differential current, is used for determining whether a detected abnormal current is due to the inrush or internal fault.
    Type: Grant
    Filed: May 17, 2001
    Date of Patent: October 25, 2005
    Inventors: Yong Cheol Kang, Sang Hee Kang, Byung Eun Lee, Jae Sung Yun
  • Relaying method for protecting transformers
    Patent number: 6731481
    Abstract: The present invention relates to a relaying method using the ratio of induced voltages or the ratio of flux linkage increments. The protective relaying method for power transformers with one or more phases includes the first step of obtaining primary and secondary voltages and currents of the transformer; the second step of calculating induced voltages, induced voltage differences, ratio of primary and secondary induced voltages, or ratio of primary and secondary induced voltage differences from the currents and the voltages; the third step of calculating at least one predetermined decision parameter derived from at least one predetermined equation; the fourth step of deciding whether an internal winding fault occurs by comparing the decision parameter to the induced voltages, the induced voltage differences, the ratio of primary and secondary induced voltages, or the ratio of primary and secondary induced voltage differences.
    Type: Grant
    Filed: October 23, 2001
    Date of Patent: May 4, 2004
    Assignees: Xelpower Co., Ltd.
    Inventors: Yong Cheol Kang, Sang Hee Kang, Byung Eun Lee, Jae Sung Yun, Seung Hun Ok
  • Relaying method for protecting a transformer using a difference of current
    Publication number: 20040004794
    Abstract: Disclosed is a relaying method for protecting a transformer by using a difference of current. A decision function, related to the difference of a primary current, a secondary current, or a differential current is used for determining whether a detected abnormal current is due to the inrush or internal fault.
    Type: Application
    Filed: January 17, 2003
    Publication date: January 8, 2004
    Inventors: Yong-Cheol Kang, Sang-Hee Kang, Byung Eun Lee, Jae-Sung Yun
  • Relaying method for protecting transformers
    Publication number: 20030036821
    Abstract: The present invention relates to a relaying method using the ratio of induced voltages or the ratio of flux linkage increments. The protective relaying method for power transformers with one or more phases includes the first step of obtaining primary and secondary voltages and currents of the transformer; the second step of calculating induced voltages, induced voltage differences, ratio of primary and secondary induced voltages, or ratio of primary and secondary induced voltage differences from the currents and the voltages; the third step of calculating at least one predetermined decision parameter derived from at least one predetermined equation; the fourth step of deciding whether an internal winding fault occurs by comparing the decision parameter to the induced voltages, the induced voltage differences, the ratio of primary and secondary induced voltages, or the ratio of primary and secondary induced voltage differences.
    Type: Application
    Filed: October 23, 2001
    Publication date: February 20, 2003
    Inventors: Yong Cheol Kang, Sang Hee Kang, Byung Eun Lee, Jae Sung Yun, Seung Hun Ok