High impedance fault analyzer in electric power

G - Physics – 01 – R

Patent

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324/29, 324/35,

G01R 31/08 (2006.01) G01R 25/00 (2006.01) G01R 29/16 (2006.01) H02H 3/26 (2006.01)

Patent

CA 1287884

ABSTRACT A system and method is disclosed for detecting an abnormality in a network for distributing or trans- mitting electric power at a predetermined fundamental frequency. The system produces a signal representing the fundamental frequency and another signal representing a harmonic current occurring in the network. The phasor relation between the fundamental voltage and harmonic current representing signal are compared. The system produces a signal indicating the occurrence of a high impedence fault in response to a predetermined change in the compared phasor relationship. Embodiments are disclosed utilizing expression of signals within the network in polar coordinates, as well as embodiments utilizing signals expressed in rec- tangular coordinates. Such embodiments include both circuitry for detecting zero crossing phenomena, as well as circuitry for producing representation of signal phasor products.

556662

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