Electrical connectors – Having retainer or passageway for fluent material – Liquid retainer
Reexamination Certificate
2000-02-08
2001-10-30
Paumen, Gary (Department: 2833)
Electrical connectors
Having retainer or passageway for fluent material
Liquid retainer
C439S201000
Reexamination Certificate
active
06309235
ABSTRACT:
The present invention relates to a fluid-insulated electrical link device enabling a high voltage electricity cable to be connected to a metal-clad unit or to an outdoor unit.
BACKGROUND OF THE INVENTION
Document EP-A-148 394 discloses an electrical link device for a metal-clad unit, where the device is insulated by means of a fluid such as sulfur hexafluoride in gaseous form. The electrical link device described in that document has a conductive link bar placed inside the enclosure with one end fixed in leakproof manner to a sleeve of insulating resin that passes in leakproof manner through the wall of the enclosure that contains the insulating gas. The link bar extends outside the enclosure and is connected to a pluggable connection member disposed in the portion of the sleeve that extends outside the enclosure and that is surrounded by a conductive screen forming a Faraday cage around the pluggable connection member.
Such an electrical link device is the seat of high levels of electric stress when it is used at very high voltage. In addition, since that device does not have any electric field-distributing member, it is necessary to provide a separate stress-reducing member which is mounted on the electricity cable prior to it being put into position, thus requiring manipulation to be performed to avoid electric stresses appearing at the interface between the inside surface of the insulating sleeve and the field-distributing member, which manipulations are difficult to perform on site.
OBJECT AND SUMMARY OF THE INVENTION
The invention proposes a fluid-insulated electrical link device comprising an enclosure containing a fluid insulator, and a conductive link bar disposed inside the enclosure and having one end fixed in leakproof manner to an insulating sleeve passing in leakproof manner through a wall of the enclosure, the link bar being connected to a pluggable connection member surrounded by a conductive screen forming a Faraday cage around the pluggable connection member, wherein the pluggable connection member is disposed inside the enclosure, and the insulating sleeve is made of elastomer material and includes a conductive deflector flush with the inside surface of the insulating sleeve and at a distance from the conductive screen surrounding the pluggable connection member.
The pluggable connection member is thus surrounded by the insulating fluid contained inside the enclosure, thereby minimizing the electric stresses in the material surrounding the pluggable connection member. In addition, the device of the invention can be fully assembled and filled with fluid in a workshop such that when an electricity cable is put into place on site, all that needs to be done is to prepare the end of the cable and engage it in the insulating sleeve so as to plug the cable conductor without any leakage from the enclosure, thus making it possible to avoid handling the fluid on site.
In addition, the insulating sleeve of elastomer is pressed closely against the outside surface of the cable because of its own elasticity and because of the pressure of the insulating fluid surrounding it, thereby minimizing the risk of faults occurring at the interface between the cable and the insulating sleeve. The deflector integrated in the insulating sleeve then performs to the full its function as an electric field distributor inside the insulating sleeve.
In an advantageous version of the invention, the deflector extends on both sides of the wall of the enclosure through which the insulating sleeve passes. This minimizes the size of the link device of the invention without harming electric field distribution.
REFERENCES:
patent: 3324449 (1967-06-01), McLoad
patent: 3643207 (1972-02-01), Cairns
patent: 4054351 (1977-10-01), Gallay et al.
patent: 4085993 (1978-04-01), Cairns
patent: 4192569 (1980-03-01), Mucci
patent: 4425017 (1984-01-01), Chan
patent: 5188538 (1993-02-01), Joveux-Boullion et al.
patent: 5558532 (1996-09-01), Hopper
patent: 3210225 (1983-09-01), None
patent: 0148394 (1985-07-01), None
Gilman Alexander
Paumen Gary
Sagem SA
LandOfFree
Fluid-insulated electrical link device does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Fluid-insulated electrical link device, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Fluid-insulated electrical link device will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-2564879