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. 02, 1988
Filed:
Jun. 13, 1986
Helmut Fornsel, Karlsruhe, DE;
Hans-Eberhard Simmel, Karlsruhe, DE;
Siemens Aktiengesellschaft, Munich, DE;
Abstract
A method for generating a tripping signal as a function of an overcurrent. Sampled measurement values are converted into digital values which are weighted and added up according to a predetermined function. If the sum value is above a predetermined reference value, the tripping signal is formed. In order to cancel the addition before the tripping signal is formed in dependence on the wave shape of the overcurrent if the overcurrent is decaying, the digital values of the respective last period of time corresponding to at least a half-period of the overcurrent are stored and a comparison of all digital values simultaneously stored with each other is made. The determined largest stored value is weighted and added up as a digital value and the addition is cancelled if a largest digital value is below the predetermined threshold.