High-voltage switches with arc preventing or extinguishing devic – Arc preventing or extinguishing devices – Resistance inserting
Reexamination Certificate
1999-10-07
2001-03-13
Scott, J. R. (Department: 2832)
High-voltage switches with arc preventing or extinguishing devic
Arc preventing or extinguishing devices
Resistance inserting
Reexamination Certificate
active
06201204
ABSTRACT:
The present invention relates to a closure resistor assembly for high voltage electrical gear, the assembly comprising a multiplicity of resistive electrical components aligned in a row along an axis, and a mechanism for exerting a compression force on the electrical components along the axis so as to maintain electrical contact between them.
BACKGROUND OF THE INVENTION
Such an assembly is designed to be fixed at the end of a break chamber in a compressed gas circuit-breaker, for example, in order to reduce the effects of high currents during closure of the circuit-breaker by inserting the resistor in the electrical circuit of the circuit-breaker.
Until now, the electrical components forming the closure resistor which are in the form of resistor disks, have been stacked inside a metal case mounted at the end of the break chamber which is vertical and said row of electrical components has generally been mounted in such a manner as to extend along the axis of the break chamber. At one end of the stack of electrical components, there is placed a spring which is put into compression by a cover which is fixed on an end opening of the case.
For a break chamber that is mounted in a horizontal position, such a disposition for the closure resistor takes up space and gives rise to a bending moment at the end of the break chamber because of the considerable length and the mass of the closure resistor, and difficulties are encountered with applying compression to the electrical components inside the case because of the risk of the compression spring expanding before the cover has been finally fixed to the case.
OBJECTS AND SUMMARY OF THE INVENTION
An object of the invention is to remedy those various drawbacks.
To this end, the invention provides a closure resistor assembly for high voltage electrical gear, the assembly comprising a multiplicity of resistive electrical components aligned in a row along an axis, and a mechanism which exerts a compression force on the electrical components along the axis so as to maintain electrical contact between them, wherein the mechanism for exerting said compression force comprises a rigid tube within which the said electrical components are stacked, and an energy-storing floating structure placed inside the tube at one end of the row of electrical components, said floating structure being constituted by a first piece disposed between said end of the row of electrical components and a second piece that is mounted in fixed manner inside the tube, together with a spring that is kept in compression between the first and second pieces, said first piece also being mounted so as to be semi-moving between two abutments that are spaced-apart along the axis D.
With such an arrangement, the electrical components are compressed along the axis D merely by exerting an axially-directed force on the other end of the row of electrical components against the force exerted by the spring on the first piece, so as to make use of the energy of the floating structure without any risk of it being ejected. This pressure can be exerted by the cover of a case inside which the tube loaded with electrical components is placed.
In addition, in accordance with the invention, the row of electrical components is fixed to the end of the break chamber of electrical gear in such a manner as to extend perpendicularly to the break chamber so as to reduce the lever arm effect.
REFERENCES:
patent: 2724755 (1955-11-01), Morgan
patent: 5262605 (1993-11-01), Pham et al.
patent: 5276285 (1994-01-01), Pham et al.
patent: 5661282 (1997-08-01), Tsuchiya
patent: 669 863 A5 (1989-04-01), None
patent: 94 16 993 U (1995-02-01), None
patent: 0 482 555 A1 (1992-04-01), None
patent: 906 954 (1962-09-01), None
Alstom France SA
Scott J. R.
Sughrue Mion Zinn Macpeak & Seas, PLLC
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