H - Electricity – 02 – H
Patent
H - Electricity
02
H
348/25
H02H 3/38 (2006.01) H02H 7/26 (2006.01) H02H 3/08 (2006.01)
Patent
CA 1323682
NEGATIVE AND ZERO SEQUENCE DIRECTIONAL OVERCURRENT UNIT 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, of the type which utilizes at least one restraint signal in conjunction with at least one operate signal to generate a net operate signal, generates an operate quantity which is related to a zero sequence component of current flowing in the power distribution system and a second operate quantity which is related to a negative sequence component of the current flowing in the power distribution system. The operate quantities are summed to form an operate signal. An adaptive restraint, which is proportional to a negative sequence component of a phase voltage of the power distribution system, is generated and utilized to provide increased sensitivity to higher resistance ground faults. A portion of a positive sequence component of the current flowing in the power distribution signal is utilized as a restraint signal to prevent the unit from operating on negative sequence currents present during normal load conditions. Adaptive restraint enables the directional overcurrent unit to operate correctly should a second fault occur on the transmission line during the period that one pole is open.
583400
Alexander George Edmund
Wilkinson Stanley Bruce
Company General Electric
Oldham And Wilson
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