EP0570264A1 - Sectionaliser with vertical contact opening and rockable column - Google Patents

Abstract

High-voltage isolator of the type comprising a female current socket placed at one end of a first vertical insulating column (2), an operating blade (13) articulated to one end of a second vertical insulating column (7) and carrying at a first end a male contact (13B) intended to cooperate with the said female contact, the movement of the blade being ensured by a mechanism connected to an oscillating insulating column (20), characterised in that the articulation of the said blade (13) to the said second column (7) is ensured by means of two levers (12, 14) of unequal length. <IMAGE>

Description

The present invention relates to a disconnector usable in particular in high voltage, of the type comprising a socket outlet of the female type placed at one end of a first vertical insulating column, an articulated blade at one end of a second vertical insulating column and carrying at a first end a male contact intended to cooperate with said female contact, the movement of said blade being provided by a mechanism connected to an oscillating insulating column.

A disconnector of this type is described in the English patent n ° 306 198. In the disconnector described in this document, the mechanism comprises a first lever articulated on the one hand to said blade and on the other hand to said oscillating column, a second lever articulated on the one hand to said blade and on the other hand to said second vertical insulating column, and a cam secured to said second vertical insulating column and cooperating with a roller disposed at the second end of said blade.

A first object of the invention is to produce a disconnector of the aforementioned type but of simpler construction.

It is observed that the operation of the disconnector described in the aforementioned patent can be greatly altered if ice forms on the cam or on the roller; in fact, the pressure exerted by the caster on the cam will not be able to break the glass, so that the movement of the blade will be disturbed to the point of being unable to close the disconnector.

Another object of the invention is to provide a disconnector whose operation is not disturbed by the presence of ice which would form either on the movement mechanism of the blade, or on the contacts.

Another object of the invention is to provide a disconnector using tulip contacts which have better short-circuit resistance than the jaw contacts.

All of these aims are achieved by the invention which relates to a high voltage disconnector of the type comprising a socket of the female type placed at one end of a first vertical insulating column, an operating blade articulated at one end of a second vertical insulating column and carrying at a first end a male contact intended to cooperate with said female contact, the movement of the blade being ensured by a mechanism connected to an oscillating insulating column, characterized in that the articulation of said blade said second column is provided by means of two levers of unequal length each connected by a first end to a part secured to said second insulating column and by a second end at points distinct from said blade, said mechanism connecting the oscillating column and said blade comprising an arm articulated at one end to said oscillating column and at another end to said blade, said female contact being constituted by a tube with a substantially horizontal axis and split longitudinally over part of its length to form contact fingers, said female contact being protected by a bell provided with ice-breaking lugs, said contact male having a bulged part which can engage between said fingers, the length and the relative arrangement of the levers being chosen to ensure, when opening the disconnector, first of all a movement of the blade having a horizontal component tending to separate the male and female contacts as well as a component tending to lower the end of the blade below the level which it has when the disconnector is in the closed position, said movement being followed by a rotation movement of the centered blade on the end of the second insulating column.

• la figure 1 est une vue en élévation d'un pôle d'un sectionneur selon l'invention, représenté en position fermée,
• la figure 2 est une vue en coupe axiale du contact femelle du pôle du sectionneur,
• la figure 3 est une vue en élévation du même pôle, représenté en position ouverte.

The invention will be clearly understood in the light of the description of an exemplary embodiment with reference to the appended drawing in which:

• FIG. 1 is an elevation view of a pole of a disconnector according to the invention, shown in the closed position,
• FIG. 2 is a view in axial section of the female contact of the disconnector pole,
• Figure 3 is an elevational view of the same pole, shown in the open position.

In the following, only one pole of the disconnector will be described, it being understood that a disconnector for a three-phase line will comprise three identical poles.

In Figure 1, the reference 1 designates a metal beam constituting the upper part of the frame of a disconnector. This frame, produced in a conventional manner and not forming part of the invention, is not described in more detail.

On the beam 1 is fixed a first vertical insulating column 2 carrying a protective cover 3 containing a female electrical contact 4, visible in detail in Figure 2, and consisting of a tube split longitudinally over part of its length so as to constitute contact fingers 4A arranged in the manner known as a tulip. This female contact is intended to cooperate with a male contact which will be described later. A spring 4B ensures the contact pressure. The hood is open in the shape of a cone and has 4C icebreaker lugs and a 4D drip tray. Contact 4 is connected to a first socket 5.

The beam 1 also carries a second vertical insulating column 7 provided with a second outlet 8. At the top of the column 8 is fixed a vertical plate 9 provided with two points of articulation 10 and 11. At the articulation 10 is connected to a first end of a first lever 12, the second end of which is articulated to one end 13A of a metal blade 13, the other end of which carries a male contact 13B co-operating with the female contact 4. At the joint 11 is connected a first end of a second lever 14, the other end of which is articulated at a point 15 to the blade 13. When the disconnector is in the closed position, the male contact is engaged in the female contact and the electrical connection between the two sockets 5 and 8 is provided by the blade 13. The male contact 13A consists of a tube having a bulged portion making it possible to ensure good contact pressure with the contact tulip. A metal braid 16 electrically connects the socket 8 and the blade 13.

• d'une part, le contact à tulipe a une meilleure résistance au court-circuit,
• d'autre part, la glace sur le contact femelle se forme plus difficilement puisque le contact femelle est protégé par le capot et que son ouverture n'est pas tournée vers le ciel.

As can be seen, a first characteristic of the invention is to use tulip contacts in place of the jaw conventionally used; this has a double advantage:

• on the one hand, the tulip contact has better short-circuit resistance,
• on the other hand, the ice on the female contact is more difficult to form since the female contact is protected by the cover and its opening is not turned towards the sky.

The movement of the blade is ensured by an oscillating insulating column, produced in the form of an insulating part 20 of the same kind as columns 2 and 7, and articulated at its lower part around a fixed horizontal axis 21. This column is provided with means not shown to allow it to perform oscillatory movements in a vertical plane, of amplitude not exceeding about twenty degrees around the vertical. These means may include, for example, a rod fixed to the base of the column 20 associated with a mechanism for operating by traction on the rod.

The top of the column 20 carries a hinge 22 to which a first end of an arm 23 is hinged, the second end 24 of which is hinged to the blade 13.

• en position fermée, la colonne 20 est inclinée au maximum de sa course et dans l'illustration de la figure 1, vers la gauche de la figure.
• pour ouvrir le sectionneur, on va imprimer au mécanisme de commande un mouvement tendant à faire basculer la colonne 20 vers la droite de la figure. On se référera à la figure 3, dans laquelle la ligne 40 représente le déplacement du contact mâle au cours d'une manoeuvre d'ouverture du sectionneur. Compte tenu de la nature du mécanisme de liaison entre la colonne oscillante 20 et la lame 13, et particulier grâce à la longueur inégale des leviers 12 et 14, l'extrémité 13A de la lame 13 effectue d'abord un mouvement rectiligne le long de son axe dans le sens qui tend à séparer les contacts 4 et 13A, ce mouvement étant associé à un léger mouvement de descente de la lame. Puis la lame effectue un mouvement de pivotement dans un plan vertical, jusqu'à atteindre la position représentée dans la figure 3, correspondant à la position ouverte du sectionneur, la lame étant alors verticale et assurant la distance d'isolement électrique entre les contacts.

The operation of the disconnector is as follows:

• in the closed position, the column 20 is inclined to the maximum of its travel and in the illustration of FIG. 1, to the left of the figure.
• to open the disconnector, a movement will be imparted to the control mechanism tending to tilt the column 20 to the right of the figure. Reference will be made to FIG. 3, in which the line 40 represents the displacement of the male contact during an opening operation of the disconnector. Given the nature of the connection mechanism between the oscillating column 20 and the blade 13, and in particular thanks to the unequal length of the levers 12 and 14, the end 13A of the blade 13 first performs a rectilinear movement along its axis in the direction which tends to separate the contacts 4 and 13A, this movement being associated with a slight movement of descent of the blade. Then the blade performs a pivoting movement in a vertical plane, until reaching the position shown in Figure 3, corresponding to the open position of the disconnector, the blade then being vertical and ensuring the electrical isolation distance between the contacts.

The disconnector closing operation is obtained by carrying out the movements in the opposite direction. The downward movement of the male contact below the horizontal, then its ascent, when the male contact approaches the female contact, makes it possible to break the ice which may have formed on the male contact, the latter coming up against the lugs 4C arranged at the input of the female contact.

The disconnector of the invention is of simple construction and consequently less expensive than the disconnects of the prior art.

The possibility of using a contact tulip allows better short-circuit resistance than jaw contacts.

The glass has less disadvantage than in the disconnectors of the prior art, since the entry of the contacts are made horizontally and a protective cover can be used.

Of course, in the foregoing, a schematic description has been given of the device. There have been described in particular levers 12 and 14, an arm 23, etc. It is obvious that these elements can be doubled and arranged respectively on either side of the blade, with suitable spacings in order to be able to cross, and in order to achieve a symmetrical and balanced whole.

The invention applies to the production of high voltage disconnectors, from 25kV.

Claims (1)

1 / High voltage disconnector of the type comprising a socket of the female type placed at one end of a first vertical insulating column, an operating blade articulated at one end of a second vertical insulating column and carrying at a first end a male contact intended to cooperate with said female contact, the movement of the blade being ensured by a mechanism connected to an oscillating insulating column, characterized in that the articulation of said blade (13) to said second column (7) is ensured at means of two levers (12, 14) of unequal length each connected by a first end to a part (9) integral with said second insulating column (7) and by a second end at separate points (24, 15) of said blade , said mechanism connecting the oscillating column (20) and said blade (13) comprising an arm (23) articulated at one end to said oscillating column (20) and at another end to the lad ite blade (13), said female contact being constituted by a tube (4) of substantially horizontal axis and split longitudinally over a part of its length to form contact fingers (4A), said female contact (4) being protected by a bell (3) provided with ice-breaking lugs (4C), said male contact having a bulged part (13B) capable of engaging between said fingers (4A), the length and the relative arrangement of the levers 12, 14) being chosen to ensure, when opening the disconnector, first of all a movement of the blade having a horizontal component tending to separate the male and female contacts as well as a component tending to bring the end of the blade down below the level which it has when the disconnector is in the closed position, said movement being followed by a rotary movement of the blade centered on the end of the second insulating column (7).

Images