FR2606942A1 - High-voltage distribution device which is screened and insulated by means of compressed gas - Google Patents

Abstract

An insulating support 2, free of electrodes, fitted into a cylinder-shaped continuous internal conductor 3, is fixed in a sealed 6 and axially elastic 7 manner to this internal conductor 3 by means of fixing elements 8, 9, whilst being placed between two annular electrodes 4, 5 fitted into the internal conductor 3. Such an installation, which makes it possible to avoid, in a technically and economically advantageous manner, the inherent drawbacks of insulating supports having sealed electrodes and/or those caused by the splitting up of the internal conductor and/or the complicated configuration of the latter, applies to high-voltage, screened and gas-insulated electrical installations.

Description

HIGH-VOLTAGE SHIELDED AND GAS-INSULATED 4-VOLTAGE DISTRIBUTION DEVICE
The invention relates to a shielded and insulated high voltage distribution device of the type comprising a cylindrical inner conductor held inside a shield by means of insulating supports.

 The objective for such distribution devices is to improve the dielectric characteristics of the connections between the insulating supports and the internal conductor, by means of control electrodes electrically connected to said internal conductor.

 German patent 2 S49 560 describes a device consisting in sealing in the insulating support a control electrode on which the two ends screwed together between the inner conductor divided in this place. This device has drawbacks, in particular the additional work required by dividing and joining the inner conductor and by sealing the electrode in the insulating support.

 Swiss patent 621,439 provides an arrangement similar to that described in German patent 2S49560 comprising an electrode sealed in the insulating support, as well as a divided internal conductor, and having, in addition to the drawbacks mentioned above, that of the particular shape of the inner conductor. Another embodiment of the Swiss patent cited above also has the drawback of dividing the inner conductor and that of the particular shape thereof. while avoiding the use of a sealed electrode.

 The example given in the drawing of American patent 4 11; 671 avoids the division of the inner conductor, while adding the drawbacks caused by a particularly complex shape - and by the fact of the direct sealing of the insulating support in the inner conductor.

 The device described in German patent 2,347,927 avoids the division of the inner conductor, while also having the drawback of the electrode sealed in the insulating support.

 The present invention aims to create a high voltage distribution device shielded and insulated at ga =, in which an undivided inner conductor and an insulating support devoid of sealed electrode are interconnected in a technically perfect and economically advantageous manner.

 The invention relates to a shielded high-voltage distribution device insulated with gas, comprising a cylindrical inner conductor held axially inside a cylindrical shield by means of at least one insulating support, said inner conductor passing through a central opening of said insulating support and being in the vicinity of said opening, connected to said insulating support and to a control electrode, the connection with said insulating support being mechanically sealed and the connection with said control electrode being electrically conductive. characterized in that the insulating support (2 ′ without electrode is hermetically and elastically disposed facing two annular electrodes 1 3, 3, these being threaded on the inner conductor (3; and fixed on it by means fasteners c.

 It is possible to manufacture the conduits usually used for internal conduits in a sufficiently precise manner that it is not necessary to subject their external surface to an additional treatment to allow their exact passage through the insulating supports, the electrodes, the seals and the springs. The manufacture of insulating supports which advantageously have the shape of a hollow cone and which are devoid of sealed electrodes is easy. Likewise, the electrodes, capable of being manufactured separately, can be appropriately shaped for their use, and easily manufactured. The same applies to the seals, the springs and the fixing.

Consequently, the invention allows an economically advantageous manufacture, while being technically efficient and of simple construction.

 One or more O-rings will advantageously be used as seals between the insulating support and the inner conductor, said O-rings may also serve as axial springs, unless spring washers are preferred in this respect, this the latter solution is sometimes preferable for a precise distribution of efforts. In the latter case, it is preferable to place an O-ring on one side of the insulating support, and on the other side a spring washer.

 The invention allows a simple and effective solution to the problem of fixing the parts to the inner conductor, by fitting two annular spaced notches on the inner conductor, each receiving a circlip intended to serve as an axial stop respectively for one of the electrodes.

 For this application, a circlip advantageously consists of two half-rings and is inserted in a groove of the corresponding electrode, it being understood that it can be embedded in said groove.

 The other circlip can be produced in the manner of an elastically flarable spring washer, advantageously having a rounded external shape, so as not to constitute a discharge edge.

 In the case where the support electrode is in the form of a hollow cone, the first circlip composed of two half-rings will advantageously be placed on the outer face facing the shield, since at this point, the The efficiency of the circlip embedded in the electrode is particularly high. Similarly, the O-ring sealing between the electrode and the insulating support will advantageously be placed on this same side, while an axially acting spring washer will be placed on the other side of the insulator.

 The circlips will advantageously be made of a conductive material, since in this case, said circlips can ensure, due to the axial spring pressure and the fact that they are embedded in the annular notches, a particularly effective electrical connection between the central conductor and electrodes.

 It can therefore be seen that, even during the application of the preferred embodiment having all the technical advantages, economically simple manufacture is ensured.

The invention will appear more clearly in the light of the description which follows, given solely by way of example and made with reference to the appended drawing, in which:
- Figure 1 is a longitudinal sectional view through a fragment of an electrically shielded and gas-insulated electrical conduit; and
- Figure 2 is a partial sectional view at the connection between the insulating support and the inner conductor.

 According to a well known principle, the shield 1 is constituted by a metal conduit. An insulating support (2), which can also be produced in a manner known per se from a suitable material, is fixed, in a manner not shown in detail, on the shield (1) and generally connected so as to be gas tight . The insulating support (2) has the shape of a hollow cone and has an internal diameter (20) adapted in such a way as the external diameter of the internal conductor (3) of conventional tubular shape, that it is possible to fit said support insulator (2) in said inner conductor 3.

I1 is the same for the two electrodes (4 and. 5), as well as (see Figure 2) for the O-ring (6) and the spring washer (7), calibrated so that it would be possible to move on the inner conductor (3 if they were not prevented by the circlips (8 and 9) placed in the annular notches (30 and 31) of the inner conductor, thereby causing contact to be established between the inner conductor (3jet the electrodes (4 and 5) due to the electrically conductive circlips (8 and 9X
As shown in the drawing, the assembly can be appropriately rounded. The circlipS8, made up of two of .. -ba = - ues, is found in the annular notch (30) and is, moreover, placed and therefore embedded in a groove (40) of the corresponding electrode (4) . This makes it possible to advantageously place it on the more delicate outer face of the insulating support in the form of a hollow cone.

 The other circlip (9) is radially elastically flarable and rounded accordingly, in order to present advantageous electrical characteristics appropriate to the desired objective.

 The assembly can be carried out as follows: We insert the electrode (4) in the inner conductor (3), we place the two halves of the circlip (R) in the annular notch c30) of the inner conductor t) and we insert the electrode (4) up to the position indicated on the inner conductor (3. We also fit into the inner conductor (3} and in the position indicated in Figure 2, the O-ring (6), the insulating support (2) , the axial spring washer (7), the electrode (5) and the circlip (9), by axially compressing the O-ring (6) and the spring washer (7), in order to allow the circlip to be engaged ( 9) in the annular notch (31).

 The result of these operations is the technically advantageous and economically profitable embodiment shown in the drawing.

Claims (10)

 1. A gas-insulated shielded high-voltage distribution device, comprising a cylindrical inner conductor held axially inside a cylindrical shield by means of at least one insulating support, said inner conductor passing through a central opening of said insulating support. and being in the vicinity of said opening connected to said insulating support and to a control electrode, the connection with said insulating support being mechanically sealed and the connection with said control electrode being electrically conductive, characterized in that the insulating support (2) does not have electrode is arranged hermetically and elastically opposite two annular electrodes (4,5), these being threaded on the inner conductor (3) and fixed thereon by means of fixing elements (8,9).  2. High voltage distribution device as claimed  tion 1, characterized in that at least one O-ring (6) is placed  between the insulating support (2) and the inner conductor (3).  3. High voltage distribution device as claimed  tion 1 or 2, characterized in that the O-ring (6) also acts  as an axial spring.  4. High voltage distribution device according to one of the re  vendications 1 to 3, characterized in that it is provided with a washer  spring '7) with axial effect.  5. High voltage distribution device as claimed  tion 4, characterized in that one of the sides of the insulating support (2) is  provided with an O-ring (6), while the opposite side of said support  insulator (2) is provided with a spring washer (7).  6. High voltage distribution device according to one of the  Claims 1 to 5, characterized in that the inner conductor (3)  is provided with two spaced apart annular notches (30,31), said notches  each comprising a circlip (8,9) serving as respective axial stop  ment to each of the two electrodes (4,5).  7. High voltage distribution device as claimed  tion 6. characterized in that a circlip (8) made up of two half-baaues  fits into an annular notch (40) of the corresponding electrode (4).  8. High voltage distribution device as claimed  tion 7. characterized in that the other circlip (9) backs the confiauration of a radially elastically flarable spring washer.  9. High voltage distribution device according to one of the re vendications.6 to 8, characterized in that the circlips (8,9) are made of an electrically conductive material.  10. High-voltage distribution device according to one of claims 1 to 9, characterized in that the insulating support (2) has the shape of a hollow cone, and that a circlip (8), advantageously composed of two half-rings, is arranged on the outer face facing the shield (1) of the insulating support (2), so as to be inserted, on the one hand, in the groove (40) of the neighboring electrode (4) , on the other hand in the annular notch (30) of the inner conductor (3).