Electricity: circuit makers and breakers – Multiple circuit control – Operating means
Reexamination Certificate
2001-11-28
2003-08-12
Enad, Elvin (Department: 2832)
Electricity: circuit makers and breakers
Multiple circuit control
Operating means
C200S400000, C218S007000
Reexamination Certificate
active
06605788
ABSTRACT:
The present invention relates to an air-insulated high-voltage disconnector.
BACKGROUND OF THE INVENTION
A disconnector includes, in particular, a pivotally-mounted arm, sometimes referred to as a “knife”, mounted to pivot about a horizontal axis and electrically connected at one of its ends to a first connector disposed at the top of a first insulating column. The other end of the arm, i.e. the free end, is provided with a contact part or “hammer” which, when the disconnector is in the closed position, co-operates with a jaw connected to a second connector disposed at the top of a second insulating column.
During disconnector closure, once the pivotally-mounted arm has been lowered, it is then turned about its axis through 90°, thereby bringing the hammer into contact with the contact parts of the jaw.
The jaw is made up of two facing parallel rows of contact parts, each part being formed of a curved copper blade fixed to a jaw support. The hammer, which extends the arm at its end, is a part made of bronze that is heavy and costly and whose section in a plane perpendicular to the axis of the arm corresponds to a circle of diameter smaller than the diameter of the arm and that is flattened along one diameter so that it is extended to coincide with the diameter of the arm, the thickness of the two diametrically opposite extensions being in the range 2 mm to 3 mm, with rounded edges.
French Patent 2 674 985 describes such a disconnector.
OBJECTS AND SUMMARY OF THE INVENTION
The present invention proposes to improve certain features of a disconnector of that type, and it provides an air-insulated high-voltage disconnector including a pivotally-mounted arm suitable for pivoting at one of its ends about a horizontal axis that is perpendicular to the axis &Dgr; of the arm, and also suitable for turning about its own axis &Dgr;, the free end of the arm carrying a contact part or “hammer” which, when the disconnector is in the closed position, co-operates with a jaw comprising a jaw support to which two facing rows of contact fingers are fixed, wherein the hammer is equipped with contact tabs co-operating with the contact fingers, each contact tab forming a wedge of angle &bgr;, which wedge acts, during disconnector closure, to meet the corresponding row of fingers with an angle of attack &agr;, said angle of attack &agr; being less than 90°.
Advantageously, the angle &bgr; is approximately in the range 30° to 40°, and the angle &agr; is about 60°.
According to another characteristic, each contact tab is provided with a curved contact face extending over an angle &dgr;, seen from the axis &Dgr; of the arm, this angle &dgr; being about 17°.
According to another characteristic, when the wedge of a contact tab comes into contact with one of said contact fingers, the angle &ggr;, seen from the axis &Dgr; of the arm, between the point of contact and the plane perpendicular to the contact finger containing the axis &Dgr;, is about 10°.
According to another characteristic, said contact fingers are fixed to the jaw support so that, when the disconnector is in the closed position, the angle E between the axis &Dgr; of the arm and the contact fingers is greater than 90°.
According to another characteristic, said facing fingers form an angle &phgr; between them that lies in the range 2° to 6°.
According to another characteristic, said contact fingers are tubular and open at both of their ends.
According to another characteristic, a locking abutment is fixed to a contact finger at a level situated above said hammer when the disconnector is in the closed position.
REFERENCES:
patent: 3388225 (1968-06-01), Foti
patent: 3544741 (1970-12-01), Kuhn
patent: 3544742 (1970-12-01), Frink
patent: 4622443 (1986-11-01), Mooz
patent: 5013876 (1991-05-01), Chabala
patent: 5739489 (1998-04-01), Marmonier et al.
patent: 5859398 (1999-01-01), McKean
patent: 6066820 (2000-05-01), Niklaus
patent: 2 674 985 (1992-10-01), None
Demissy Daniel
Huynh Anh-Dung
Marchand Richard
Alstom
Enad Elvin
Lee K.
Sughrue & Mion, PLLC
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