Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2009-04-09
2011-12-20
Koval, Melissa (Department: 2858)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S512000
Reexamination Certificate
active
08081002
ABSTRACT:
A method and apparatus for determining a distance of a phase-to-phase fault or a three-phase fault on a three-phase electric line, the apparatus (40) being configured to determine a first estimate value for a distance between the measuring point (40) and a point (F) of fault on the basis of a first equation based on a fault loop model in which the point of fault is located between the measuring point and load of the electric line, and a second estimate value for the distance on the basis of a second equation based on a fault loop model in which the load of the electric line is located between the measuring point and the point of fault, and to select according to predetermined criteria one of the determined two estimate values as the distance between the measuring point (40) and the point of fault (F).
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Altonen Janne
Wahlroos Ari
ABB Technology AG
Buchanan & Ingersoll & Rooney PC
Koval Melissa
Miller Daniel
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