Patents by Inventor Per Miram

Per Miram 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).

  • Installation for power transmission by means of high-voltage direct current, comprising device for detection of a permanent ground fault
    Patent number: 5946172
    Abstract: An installation for power transmission by high-voltage direct current has at least two converter stations which are interconnected by a dc line (DC), at least one station (SR1) having a line protection device (LP) adapted to detect a ground fault on the dc line and, when a ground fault is detected, to achieve a reduction of the voltage (U.sub.D) and the current (I.sub.D) of the line and thereafter to make a restart attempt. The installation has, in addition, a detection circuit (FD) for detection of a permanent low-impedance ground fault on the dc line. The detection circuit is activated after an intervention by the line protection device. During a detection interval, the detection circuit causes one of the stations (SR1) to feed a current into the line.
    Type: Grant
    Filed: April 28, 1998
    Date of Patent: August 31, 1999
    Assignee: Area Brown Boveri AB
    Inventors: Erik Hansson, Mats Hyttinen, Per Miram