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:
Aug. 26, 2014
Filed:
Jul. 20, 2012
Thomas Driehorn, Berlin, DE;
Gerd Müller, Falkensee, DE;
Thomas Driehorn, Berlin, DE;
Gerd Müller, Falkensee, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A switch and a method for testing the power transformers of a power supply of the switch are provided, wherein each power transformer generates an analog transformer voltage corresponding to the alternating current, wherein an electronic trip unit, to which each transformer voltage is applied, compares a current derived from each transformer voltage with a current condition, and wherein a rectifier circuit connected to the power transformer charges a capacitor which feeds the power supply of the trip unit. A switching device short-circuits each rectifier circuit when a predefined capacitor voltage is reached. To provide the protective function of the switch, a monostable multivibrator is connected to one pole of each power transformer, wherein each monostable multivibrator is set by the respective transformer voltage and reset after a predefined time, and wherein the level at the output of each monostable multivibrator is used to test the respective power transformer.