High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Arc runner
Reexamination Certificate
2001-04-18
2001-11-20
Donovan, Lincoln (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Arc runner
C218S118000, C218S123000
Reexamination Certificate
active
06320149
ABSTRACT:
BACKGROUND ART
In the precharacterizing clause of patent claim
1
, the invention refers to a prior art as is known from DE 2925162 C2. This describes a high-voltage switch with a moving switching piece between an inner and an outer stationary switching piece. A contact finger is inserted into the outer switching piece and has a contact loop fitted with a leafspring which presses against a contact ring on the moving switching piece of the electrical switch when said switch is in the closed state. A loop-type contact is arranged on the moving switching piece and presses against the inner switching piece when the electrical switch is in the closed state, and opens after the contact finger has opened when the electrical switch is opening. During the disconnection process, a comparatively high voltage builds up in a very short time between the rated electrical contacts, and this extremely rapidly drives the current to be disconnected, from the rated current path into a power path. The arc which is struck when the contact finger contact opens is blown by the loop of the magnetic field; it is extinguished quickly since, initially, there is still an alternative current path between the moving switching piece and the inner, stationary switching piece.
The construction of such a rated current contact system with a large number of contact fingers and associated holders and contact-pressure springs is relatively complex and expensive.
SUMMARY OF THE INVENTION
The invention, as it is defined in patent claim
1
, achieves the object of further developing electrical contact arrangements in an electrical switch of the type mentioned initially in such a way that the electrical switch can be produced more easily and more cost-effectively.
Advantageous refinements of the invention are defined in the dependent patent claims.
One advantage of the invention is that no additional power current path is required to supplement the rated current path.
According to one advantageous refinement of the invention, it is possible, using simple means, to enlarge the arc length and thus to increase the commutation voltage, to improve the disconnection response, and to reduce the wear to the electrical contacts.
REFERENCES:
patent: 1942678 (1934-01-01), Austin
patent: 5844189 (1998-12-01), Niemeyer
patent: 6107590 (2000-08-01), Skindhoj et al.
patent: 480164 (1929-07-01), None
patent: 1921160 (1970-08-01), None
patent: 2925162C2 (1980-12-01), None
patent: 2925162 (1980-12-01), None
ABB Research Ltd.
Burns Doane Swecker & Mathis L.L.P.
Donovan Lincoln
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