Method and system for determining location of phase-to-earth...

Details Method and system for determining location of phase-to-earth... Method and system for determining location of phase-to-earth...

2007-06-19

2007-06-19

Deb, Anjan (Department: 2858)

Electricity: measuring and testing

Fault detecting in electric circuits and of electric components

For fault location

C702S059000

Reexamination Certificate

active

11476547

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 (30a,30b,30c), 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.

REFERENCES:
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Finnish Office Action dated Dec. 20, 2005.
Dr. Edmund O. Schweitzer, III et al., A Review of Impedance-Based Fault Locating Experience, Presented Before the Fourteenth Annual Iowa-Nebraska, System Protection Seminar, Oct. 16, 1990, Omaha, Nebraska, pp. 1-31.
European Search Report dated Oct. 23, 2006.

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