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:
May. 16, 2017
Filed:
Nov. 20, 2015
Abb S.p.a., Milan, IT;
ABB S.P.A., Milan, IT;
Abstract
An electronic device () for measuring a differential current (ID) in an electric line () having a plurality of conductors, said electronic device comprising: a sensing circuit () comprising: a current transformer () having a magnetic core () through which the conductors of said electric line pass, a secondary winding () and an excitation winding () along which an excitation current (IE) circulates to polarize said magnetic core (); an output circuit section () electrically connected to said secondary winding () and configured to provide a first signal (V). The electronic device () further comprises: a first signal processing block () configured to process said first signal (V) and provide a second signal (VD) indicative of said differential current (ID); a second signal processing block () configured to process said second signal (VD) and provide a first measurement signal (IDCM) indicative of the absolute value of a time-invariant component of said differential current (ID); a third signal processing block () configured to process said first signal (V) and provide third and fourth signals (S, S) indicating whether said magnetic core () operates in a positive and/or in a negative saturation region of the hysteresis loop of said magnetic core; a fourth signal processing block () configured to process said third and fourth signals (S, S) and provide a second measurement signal (SDC) indicative of the direction of the time-invariant component of said differential current (ID).