Data processing: measuring – calibrating – or testing – Measurement system in a specific environment – Electrical signal parameter measurement system
Reexamination Certificate
2005-04-12
2005-04-12
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system in a specific environment
Electrical signal parameter measurement system
C702S059000, C702S064000, C702S071000, C702S094000, C702S150000, C361S080000, C361S081000, C324S525000, C324S522000, C340S870140
Reexamination Certificate
active
06879917
ABSTRACT:
When a disturbance (for example, lightning strike) occurs on a high-voltage overhead transmission line, the line must be checked for any possible damage. If the distance-to-fault is known, line crews can be quickly dispatched for any necessary repair. The present invention is a fault location method and system that uses filtered, time-synchronized positive- or negative-sequence voltage and current measurements from both ends of the overhead transmission line to determine the exact distance to the fault with respect to either end.
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Nouri et al., ‘An Accurate Fault Location Technique for Distribution Lines with Tapped Loads Using Wavelet Transform’, Jan. 2001, IEEE Article, pp. 1-4.*
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Brochure: Schweitzer Engineering Laboratories, Inc., “SEL-121 Distance Relay and Fault Locator”, no date, 3 pages.
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Desta Elias
Faust Richard S.
Hoff Marc S.
Progress Energy Carolinas Inc.
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