Fault detection in electrical transmission lines

Details Fault detection in electrical transmission lines Fault detection in electrical transmission lines

G - Physics

01

R

G01R 25/00 (2006.01) G01R 31/02 (2006.01) G01R 31/08 (2006.01) H02H 3/26 (2006.01) H02H 3/28 (2006.01)

Patent

CA 2314838

Fault detection in a multi-phase electrical transmission line (30, 32, 34) is accomplished by providing detectors (36, 38, etc.) at each end of a line section which detect the current flowing into and out of the line section and output a value of the current. The outputs of the detectors are processed in a microprocessor- controlled relay unit (80, 82, 84) by calculating the phasor relationship between the instantaneous current flowing in the line section and the voltage, thereby determining whether there is a component of the current vector in the same direction as the voltage vector. If there is a component of current in phase with the voltage, then a fault is present in that line section.

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