Out-of-step blocking unit

Details Out-of-step blocking unit Out-of-step blocking unit

1987-11-12

1989-04-25

Jennings, Derek S.

Electricity: electrical systems and devices

Safety and protection of systems and devices

Feeder protection in distribution networks

261 67, 261 76, 261 81, 261 85, H02H 300

Patent

active

048253235

ABSTRACT:
An out-of-step blocking unit of a protective relay for detecting faults in a three phase alternating current electrical power distribution system utilizes restraint signals in conjunction with an operating signal to generate a net operate signal as a restraint to the relay in order to prevent operation of circuit breakers associated with the relay as a result of load swings in the power distribution system. The restraint signals include a signal related to a negative sequence component of current flowing in the distribution system; a signal related to a zero sequence component of current flowing in the power distribution system; and a signal related to a .DELTA. (IZ-V) quantity which is the difference between fault and prefault values of the quantity (IZ-V).

REFERENCES:
patent: 3992651 (1976-11-01), Hodges
patent: 4254444 (1981-03-01), Eriksson et al.
patent: 4342062 (1982-07-01), Hodges
patent: 4420788 (1983-12-01), Wilkinson et al.
patent: 4433353 (1984-02-01), Wilkinson
patent: 4453191 (1984-06-01), Wilkinson
patent: 4686601 (1987-08-01), Alexander et al.

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