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:
Feb. 14, 2006
Filed:
Feb. 14, 2003
Matthias Kereit, Berlin, DE;
Matthias Kereit, Berlin, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A method and apparatus for producing a fault signal are disclosed which indicate a short to ground on a polyphase power transmission line, in which, the phase currents on the power transmission line are detected by means of current transformers in order to form a sum current measured value. Furthermore, a first short to ground suspicion signal is produced if the sum current measured value is greater than a predetermined current threshold value, the phase voltages on the power transmission line are detected in order to form a residual voltage measured value, and a second short to ground suspicion signal is produced if the residual voltage measured value is greater than a predetermined voltage threshold value, and a fault signal which indicates a short to ground is produced if at least one short to ground suspicion signal is present.