Electricity: electrical systems and devices – Safety and protection of systems and devices – Transformer protection
Reexamination Certificate
2008-01-24
2010-10-12
Jackson, Stephen W (Department: 2836)
Electricity: electrical systems and devices
Safety and protection of systems and devices
Transformer protection
C361S093900, C361S041000
Reexamination Certificate
active
07813090
ABSTRACT:
A DC switchgear is provided with a commutation-type DC circuit breaker having a main circuit provided with a main switch for interconnecting a DC power supply and a load, and a commutating circuit provided with a commutating capacitor and a commutating switch, which is connected electrically parallel to the main switch. The switchgear further has a DC circuit breaker accommodating box that includes the main circuit provided with the main switch, and the commutation-type DC circuit breaker; a front accommodating box disposed on the front of the DC circuit breaker accommodating box, which accommodates devices having functions for controlling the switchgear and indicating a status, such as a failure status thereof; and a rear accommodating box disposed on the back of the DC circuit breaker accommodating box. The front and rear accommodating boxes are connected to the DC circuit breaker accommodating box to form an integrated DC switchgear.
REFERENCES:
patent: 4300181 (1981-11-01), Premerlani
patent: 4751606 (1988-06-01), Matsko et al.
patent: 5484972 (1996-01-01), Tecchio
patent: 7030769 (2006-04-01), Miller
patent: 2000-050431 (2000-02-01), None
Haga Masaru
Kawamura Naoki
Matsuda Yoshihiko
Suzuki Masato
Hitachi , Ltd.
Jackson Stephen W
Kitov Zeev
Mattingly & Malur, P.C.
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