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:
Jun. 08, 1976
Filed:
Nov. 21, 1974
Applicant:
Inventor:
Ake Ekstrom, Ludvika, SW;
Assignee:
Allmanna Svenska Elektriska Aktiebolaget, Vasteras, SW;
Attorney:
Primary Examiner:
Int. Cl.
CPC ...
H02M / ;
U.S. Cl.
CPC ...
321 / ; 333-3 ;
Abstract
A direct current transmission system includes two separate parallel transmission circuits each including convertors. The transmission circuits are bipolar. One pole of one of the circuits is provided with pole reversing switches for the convertors of that pole. The poles of each of the circuits are connected in parallel by transmission lines. Switches are provided by which one of the transmission lines of one circuit can be disconnected from that circuit and connected across a faulty transmission line of the other circuit, which meanwhile is disconnected therefrom, so as to substitute for the disconnected transmission line of the second circuit.