G - Physics – 01 – R
Patent
G - Physics
01
R
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
Jeerings Donald I.
Linders John R.
Jeerings Donald I.
Linders John R.
Ridout & Maybee Llp
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