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:
Dec. 21, 1993
Filed:
May. 27, 1992
Applicant:
Inventor:
Naomi Nakamura, Tokorozawa, JP;
Assignee:
Kabushiki Kaisha Toshiba, Kawasaki, JP;
Attorney:
Primary Examiner:
Assistant Examiner:
Int. Cl.
CPC ...
H02J / ;
U.S. Cl.
CPC ...
363 51 ; 363 35 ; 363 37 ;
Abstract
There is disclosed an apparatus for detecting a short-circuit of a bi-polar d.c. transmission system in which one end of a neutral line is ground and the other end thereof is not ground. This short-circuit detecting apparatus is adapted to detect a short-circuit between d.c. transmission lines on conditions that a current flowing in the neutral line is below a predetermined value, that a ground current at the ground point of the neutral line is below a predetermined value, and that a difference between bi-polar current command values is above a predetermined value.