High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Air-current blowout
Reexamination Certificate
1999-10-29
2001-05-08
Scott, J. R. (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Air-current blowout
C218S065000, C218S084000, C218S146000, C218S154000
Reexamination Certificate
active
06229109
ABSTRACT:
FIELD OF THE INVENTION
The invention relates to a power circuit breaker such as is used in power stations, transformer substations and other electric power supply facilities for switching operating currents and overcurrents on and off.
BACKGROUND OF THE INVENTION
EP-A-0 313 813 discloses a power circuit breaker of the generic type. In the case of such power circuit breakers, the contact pin is respectively connected in an electrically conducting fashion to the corresponding electric terminal through a sliding contact arrangement which acts between the outer side of the contact pin and a fixed sliding contact directly surrounding the latter.
Because of the small circumference of the contact pin, in this design of the sliding contact arrangement the contact surface is necessarily small, with the result that the preconditions for good current transfer are rather unfavorable.
SUMMARY OF THE INVENTION
Accordingly, an object of the invention is to improve a switch of the generic type with regard to the current transfer between the contact pin and the corresponding electric terminal.
The invention substantially reduces the contact resistance of the sliding contact arrangement and correspondingly improves the current transfer. Moreover, the length of the sliding contact arrangement is reduced, with the result that the overall length of the contact pin can be reduced. This, in turn, facilitates its precise mechanical guidance, so that the bearing for the contact pin can be kept short. The overall result is a shorter overall length of the power circuit breaker.
REFERENCES:
patent: 4205209 (1980-05-01), Thuries et al.
patent: 4973806 (1990-11-01), Kirchesch et al.
patent: 5478980 (1995-12-01), Freeman et al.
patent: 5578806 (1996-11-01), Hofbauer et al.
patent: 2723552 (1978-11-01), None
patent: 2323350C2 (1984-07-01), None
patent: 0313813A1 (1989-05-01), None
patent: 999569 A2 (2000-05-01), None
Kretz Harald
Vestner Markus
Asea Brown Boveri AG
Burns Doane Swecker & Mathis L.L.P.
Scott J. R.
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