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. 20, 2002
Filed:
Jul. 14, 2000
Eric Suptitz, Montaud, FR;
Pierre Blanchard, Voreppe, FR;
Square D Company, Palatine, IL (US);
Abstract
An earth protection device having an input for receiving a first signal representative of an earth fault current, a first signal processing module, and a module for processing protection functions connected to the first signal processing module. The device includes a second signal processing module connected between the input and the first signal processing module for processing the first signal representative of the earth fault current and for supplying to the first signal processing module a second signal representative of the earth fault current. In order to increase the value of the second signal over an RMS value when the fault current comprises pulses of short duration, the second signal has, at decreasing second signal values, a gradient lower than a preset gradient limiting value.