The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 25, 2005
Filed:
May. 17, 2001
Applicants:
Yong Cheol Kang, Deokjin-gu, Chonju-si, Chunbuk 561-231, KR;
Sang Hee Kang, Seocho-gu, Seoul 137-061, KR;
Byung Eun Lee, Chonju-si, KR;
Jae Sung Yun, Kunsan-si, KR;
Inventors:
Yong Cheol Kang, Deokjin-gu, Chonju-si, Chunbuk 561-231, KR;
Sang Hee Kang, Seocho-gu, Seoul 137-061, KR;
Byung Eun Lee, Chonju-si, KR;
Jae Sung Yun, Kunsan-si, KR;
Assignee:
Other;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02H007/04 ;
U.S. Cl.
CPC ...
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.