Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – Of ground fault indication
Reexamination Certificate
2007-12-28
2010-06-01
Dole, Timothy J (Department: 2831)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
Of ground fault indication
C324S500000, C361S023000
Reexamination Certificate
active
07728600
ABSTRACT:
A method, system and apparatus for determining a distance of a phase-to-earth fault on a three-phase electric line (30), the apparatus (40) being configured to determine a first estimate value for a distance between the measuring point (40) and a point of fault (F) on the basis of a first equation based on a fault loop model of the electric line, in which model the load of the electric line is located between the measuring point and the point of fault; determine a second estimate value for the distance on the basis of a second equation based on a fault loop model of the electric line, in which model the point of fault is located between the measuring point and load of the electric line; and select, according to predetermined criteria, one of the determined two estimate values as the distance between the measuring point and the point of fault.
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Altonen Janne
Wahlroos Ari
ABB Technology AG
Buchanan & Ingersoll & Rooney PC
Dole Timothy J
Hoque Farhana
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