High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Magnetic blowout
Reexamination Certificate
2001-12-19
2003-05-27
Enad, Elvin (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Magnetic blowout
C200S04800A
Reexamination Certificate
active
06570117
ABSTRACT:
BACKGROUND OF THE INVENTION
1. Field of the Invention
The present invention relates to an air-insulated high-voltage disconnector.
2. Description of the Prior Art
A disconnector includes an arm, often referred to as the blade, pivoting about a horizontal axis and electrically connected at one of its ends to a first connector disposed at the top of a first column insulator; the other end of the arm, its free end, includes a contact part, called the hammer, which, in the closed position of the disconnector, cooperates with a jaw connected to a second connector disposed at the top of a second column insulator.
When the disconnector is closed, by lowering the pivoting arm, the arm rotates 90° about its axis and the hammer therefore comes into contact with the contact parts of the jaw.
The jaw consists of two facing parallel rows of contact members each taking the form of a pair of copper blades fixed to a jaw support. The hammer which extends the arm at its end is a heavy and costly bronze component whose section in a plane perpendicular to the axis of the arm corresponds to a circle of smaller diameter than the arm and which is flattened along one diameter, which is extended to merge with a diameter of the arm, the two diametral extensions having rounded edges and a thickness from 2 to 3 mm.
French patent 2 674 985 describes a disconnector of the above kind.
SUMMARY OF THE INVENTION
The present invention proposes to improve certain aspects of a disconnector of the above type and provides an air-insulated high-voltage disconnector including a pivoting arm which is adapted to pivot at one of its ends about a horizontal axis perpendicular to the axis &Dgr; of the arm and to turn about its axis &Dgr;, the free end of the arm carrying a contact member referred to as the hammer cooperating, in the closed position of the disconnector, with a jaw including a jaw support to which are fixed two facing rows of tubular contact fingers open at both ends.
According to another feature, the facing fingers have an angle &phgr; between them from 2° to 6°.
According to another feature, the contact fingers are fixed to the jaw support so that, in the closed position of the disconnector, the angle E between the axis &Dgr; of the arm and the contact fingers is greater than 90°.
According to another feature, the hammer is equipped with contact plates cooperating with the contact fingers, each contact plate forming a wedge of angle &bgr; which, when the disconnector is closed, encounters the corresponding row of fingers with an angle of attack &agr; less than 90°.
Each contact plate advantageously has a curved contact face subtending an angle &dgr; of the order of 17° as seen from the axis &Dgr; of the arm.
According to another feature, at the moment the wedge of a contact plate comes into contact with one of the contact fingers, the angle &ggr; as seen from the axis &Dgr; of the arm between that contact point and the plane perpendicular to the contact finger passing through the axis &Dgr; is of the order of 10°.
One embodiment of the invention will now be described with reference to the accompanying drawings.
REFERENCES:
patent: 2733322 (1956-01-01), Curtis
patent: 2745919 (1956-05-01), Hollander
patent: 2963560 (1960-12-01), Koerner et al.
patent: 3544742 (1970-12-01), Flink
patent: 4379956 (1983-04-01), Cleaveland et al.
patent: 5198630 (1993-03-01), Demissy et al.
patent: 5228559 (1993-07-01), Demissy
patent: 10 22 299 (1958-01-01), None
patent: 19 28 922 (1970-12-01), None
Demissy Daniel
Huynh Anh-Dung
Marchand Richard
Alstom
Enad Elvin
Fishman M.
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