H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/25
H02H 3/34 (2006.01) H02H 3/38 (2006.01) H02H 7/26 (2006.01)
Patent
CA 1311828
11RC 04680 THE POSITIVE SEQUENCE DISTANCE RELAY FOR AC POWER TRANSMISSION LINE PROTECTION ABSTRACT OF THE DISCLOSURE A protective relay for detecting faults within a predetermined protected zone of a three phase alternating current electrical power distribution system generates a polarizing signal VPOL which includes a signal V1 related to a positive sequence component of a phase voltage of the three phase power distribution system. A signal I1ZR, which is a signal related to a positive sequence component of a phase current of the three phase power distribution system multiplied by a replica impedance of the protected zone of the three phase power distribution system, is also generated. The coincidence of the VPOL and I1ZR signals are compared and an operate signal is generated as a result of positive coincidence. A first restraint signal is generated as a result of negative coincidence. A second restraint signal related to V1 is also generated. A net operating signal is generated when the magnitude of the operate signal exceeds the sum of the magnitudes of the first restraint signal and the second restraint signal.
583399
Company General Electric
Oldham And Wilson
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