Patent ID: 9425609
Filing Date: 2016-08-23
CPC Classification: G01R,H02H

Claim Text:
1. A method for differential protection of a three phase electric connection of an electric system, the method comprising: detecting current quantities at a first point and a second point of the three phase electric connection of the electric system; determining a value of an operate quantity, the operate quantity being based on a difference between the detected current quantities at the first point and the second point of the electric connection; determining that a fault is present in the electric connection between the first point and the second point if the value of the operate quantity exceeds a value of a predetermined threshold quantity; and controlling, by at least one protective relay, a switching element of the electric system to activate a fault protection when a fault in the electric connection is determined to be present, wherein the operate quantity I where d3Ī 3Ī 3Ī where φ Ū