Electricity: measuring and testing – Fault detecting in electric circuits and of electric components – For fault location
Reexamination Certificate
2011-01-18
2011-01-18
Natalini, Jeff (Department: 2831)
Electricity: measuring and testing
Fault detecting in electric circuits and of electric components
For fault location
C324S500000, C361S080000
Reexamination Certificate
active
07872478
ABSTRACT:
A method and an adaptive distance protection relay for compensating for a remote line end infeed effect during determination of a distance to a resistive fault on a three-phase power transmission line. It is assumed that a fault current flows through the fault resistance. A fault loop impedance is first calculated by a known algorithm from phase voltages and phase currents. A shift of the fault loop impedance is determined from the fault loop impedance, the impedance of the transmission line for the positive current sequence and the phase angle of a complex fault current distribution factor, where the fault current distribution factor is the ratio of the fault loop current to the fault current. The distance to fault is calculated by subtracting the impedance shift from the fault loop impedance and dividing the result by the impedance of the transmission line for the positive current sequence.
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Izykowski Jan
Rosolowski Eugeniusz
Saha Murari
ABB Technology Ltd.
Franklin Eric J.
Hoque Farhana
Natalini Jeff
Venable LLP
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