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:
Jun. 19, 2007
Filed:
Jun. 29, 2006
Janne Altonen, Toijala, FI;
Ari Wahlroos, Vaasa, FI;
Janne Altonen, Toijala, FI;
Ari Wahlroos, Vaasa, FI;
ABB Oy, Helsinki, FI;
Abstract
A method and system for determining a location of a phase-to-earth fault in a line of an electric network, the electric line comprising two or more sections (), the system being configured to determine, at a measuring point, a reactance of a fault loop; determine a faulted section of the electric line to be a section closest to the measurement point of all such sections for which a sum of a positive sequence reactance and an earth return path reactance of the section in question and positive sequence reactances and an earth return path reactances of sections, if any, between the measurement point and the section in question is greater than or equal to the determined reactance of the fault loop; and calculate a distance between the measuring point and a point of fault on the basis of the reactance values.
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