Electric power circuit protecting apparatus using...

Electricity: electrical systems and devices – Safety and protection of systems and devices – Superconductor protective circuits

Reexamination Certificate

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Reexamination Certificate

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07545611

ABSTRACT:
An electric power circuit protecting apparatus using a superconductor in an electric power system needing re-closing within a predetermined time from fault current blocking, comprising a main circuit breaker; a first superconductor element connected in series to the main circuit breaker; a first auxiliary switch to switch a circuit between the first superconductor element and the main circuit breaker; a second superconductor element connected in parallel to the first superconductor element and the first auxiliary switch; a second auxiliary switch to switch a circuit between the second superconductor element and the main circuit breaker; a first monitoring unit for detecting a voltage across the first superconductor element and for supplying a first switching control signal to the first auxiliary switch to be switched to the circuit open position, and a second switching control signal to the second auxiliary switch to be switched to the circuit close position; and a second monitoring unit for detecting a voltage across the second superconductor element, the second monitoring unit for supplying a second switching control signal to the second auxiliary switch to be switched to the circuit open position, and a first switching control signal to the first auxiliary switch to be switched to the circuit close position.

REFERENCES:
patent: 4467384 (1984-08-01), Yuasa
patent: 5218505 (1993-06-01), Kubo et al.
patent: 5225956 (1993-07-01), Hara et al.
patent: 6411479 (2002-06-01), Zueger et al.
patent: 7091799 (2006-08-01), Hennessy et al.
patent: 2005/0068701 (2005-03-01), Lee et al.
patent: 64-012438 (1989-01-01), None
patent: 1-185127 (1989-07-01), None
patent: 2000-294068 (2000-10-01), None
Translation of JP 2000-294068. Morita et al. Oct. 2000.
English language abstract of JP 2000-294068.
English language abstract of JP 64-012438.
U.S. Appl. No. 11/427,816 to Lee et al., which was filed on Jun. 30, 2006.
U.S. Appl. No. 11/616,458 to Lee et al., which was filed on Dec. 27, 2006.
English language Abstract of JP 1-185127 A Jul. 24, 1989.

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