EP0094858B1 - Operating device for the poles of a high-voltage multi-pole circuit breaker - Google Patents

Description

The invention relates to a control device according to the preamble of claim 1.

A known circuit breaker of the kind mentioned (DE-A _No. 2910379) has three column-shaped poles arranged in line on a chassis, the center distance being determined by the dielectric strength of the surrounding medium. The three poles are simultaneously controlled by a sliding rod connecting the contact rods of the different poles, this rod being actuated by a control member common to the three poles. The pole support frame constitutes a sealed casing connecting the enclosures of the different poles and containing the control rod, which crosses the wall of the casing in a sealed manner to cooperate with the control member disposed outside the casing. The housing is large and the control mechanism is complicated and specific to each installation.

The object of the present invention is to allow the realization of a simple and modular control device and this object is achieved by the features of claim 1.

The control shaft only performs a rotational movement and in the general case of a circular section shaft, the diameter of the housing is only slightly greater than that of the rotary shaft. The rotary shaft and the casing are advantageously produced in several aligned sections which extend in the center distance of the different poles. From standard elements it is possible to make circuit breakers having any number of poles. The subdivision of the control shaft into several sections also allows compensation for misalignment of the different poles.

The document US-A No. 3864534 describes a shielded high-voltage circuit breaker, each pole of which comprises several modules electrically connected in series. The pneumatic type double pressure circuit breaker has a blow-off valve operated at the same time as the movable contact. The modules of the same pole are controlled by a rotary shaft carrying cranks for actuating the contacts and the blowing valves of the different modules. The operating forces are significantly lower than those required to control self-blowing circuit breakers and the spacing of the modules is limited.

According to a development of the invention, the successive sections of the rotary shaft are coupled by being fitted into the hubs of the cranks for controlling the contact rods of the poles. The nested ends are grooved to achieve a rigid coupling and an efficient transmission of the control force. Each pole has at its base a housing for housing the control crank, this casing having flanges for connecting the casing sections sheathing the control shaft. The assembly formed by the pole enclosures and the casing is sealed by static seals at the connection flanges and by a single dynamic seal at the crossing of the control shaft. On the outer end of the control shaft is keyed a crank driven on the one hand by a trigger spring, and on the other hand by a control mechanism. This mechanism can be an electrical, mechanical, hydraulic or pneumatic control, and in a preferred embodiment it includes a closing spring capable of arming the opening or tripping spring during the closing operation of the poles. .

• la fig. 1 est une vue schématique en élévation d'un disjoncteur tripolaire, équipé d'un dispositif de commande selon l'invention;
• la fig. 2 est une vue de droite de la fig. 1 ;
• la fig. 3 est une vue à échelle agrandie et en coupe suivant la ligne III-III de la fig. 1, le châssis de support n'étant pas représenté.

Other advantages and characteristics of the invention will emerge more clearly from the description which follows of an embodiment of the invention given by way of nonlimiting example and represented in the appended drawings, in which:

• fig. 1 is a schematic elevation view of a three-pole circuit breaker, equipped with a control device according to the invention;
• fig. 2 is a view from the right of FIG. 1;
• fig. 3 is an enlarged view in section along the line III-III of FIG. 1, the support frame not being shown.

In the figures, three poles 10, 12, 14 in the form of columns are carried by a beam 16 in the form of a box resting on two legs 18, 20. The legs 18, 20 and the beam 16 constitute a frame on which are fixed, with a center distance determined by the dielectric strength of the air, the poles 10, 12, 14. The poles 10, 12, 14 each have a sealed enclosure filled with sulfur hexafluoride in which the contacts connected to a control rod are housed and a self-blowing device, for example with pistonable volume. The base of each pole 10, 12, 14 is formed into a housing 22 for housing a crank 24, on which the end of the contact rod 26 is articulated. The casings 22 are housed inside the beam 16, and the cranks 24 struggle in planes perpendicular to the longitudinal direction of the beam 16. A rotary control shaft 28 in four sections 30, 32, 34, 36 aligned connects on the one hand the cranks 24 of the poles together , and on the other hand these cranks 24 with a control crank 38. The grooved ends 40 of the sections 30, 32, 34, 36 are fitted into the hubs 42 of the cranks 24, which constitute rigid connecting sleeves between the successive sections . The rotary shaft 28 is mounted for rotation in bearings 44 carried by the housings 22 and it is easy to see that the assembly constitutes a rigid shaft carrying three cranks 24 spaced apart for controlling the contacts of the poles 10, 12, 14, and an actuating crank 38. The rotary shaft 28 extends inside a casing formed on the one hand by the casings 22 and on the other hand by casing sections 46, 48 extending in the 'center distance of the poles 10, 12, 14. The sections 46, 48 carry at their ends connection flanges 50 fixed with interposition of seals 52 to flanges 54, 56 of the housings 22. In the example illustrated by the fig. 3, the housings 22 of the poles 12, 14 are identical, the casing 22 of the pole 10 having an extension 58 for housing a dynamic seal 60 surrounding the section 30 of the rotary shaft 28. It is clear that all of the housings 22 could be identical, the extension 58 being in this case produced by a piece attached to the casing 22 of the pole 10. On the side opposite to the sealed crossing of the shaft 28 the casing is closed by a cover 62 bolted to the flange 56 of the casing 22 of the pole 14.

The three enclosures of the poles 10, 12, 14 communicate with one another by the housing sections 46, 48, and the filling of these enclosures with sulfur hexafluoride can be achieved by a single closable orifice. The sections 46, 48 are advantageously of circular section and their internal diameter is only slightly greater than the diameter of the shaft 28. The sections 46, 48 extend inside the beam 16 and they allow control of the three poles by a single shaft with a single dynamic seal.

The control crank 38, disposed outside the casing, is attacked on the one hand by a trigger spring 64 and on the other hand by a rod 66 of a control member 68, schematically represented by a box on the fig. and 2. The control member 68 can be a hydraulic, pneumatic, electric or mechanical control, and it will not be described in detail below.

In an exemplary embodiment, this control 68 is a mechanical control of the type described in French patent No. 1586097. This control includes a closing spring capable of arming the triggering or opening spring 64 during the closing maneuver. poles 10, 12, 14. The command 68 includes hooks in the open and closed position allowing an engagement and triggering command, in particular from a distance, in a manner well known to specialists.

The operation of the mechanism is apparent from the previous presentation. An opening or closing command by the control member 68 causes the shaft 28 to rotate in one direction or the other, this rotation being transmitted by the cranks 24 to the contact rods 26 of the three poles 10, 12.14. It should be noted that the effort is. transmitted from the section 30 to the section 32 via the hub 42 of the crank 24 whose resistance must of course be fixed accordingly. In an analogous manner, the force between the sections 32, 34 is transmitted by the hub of the crank 24 of the pole 12. The connection between the sections 30 to 34 and the hubs 42 can be made in a different way, for example by keying, the connection described by grooves having the advantage of a uniform distribution of stresses.

The assembly constitutes a modular system largely using standard elements, in particular shaft sections 32, 34 and casings 46, 48. The realization of a quadrupole circuit breaker is obtained by simple addition of an additional pole on the side opposite the crank 38, this additional pole being connected to the adjacent pole 14 by a shaft section and a casing section similar to the sections 34,48 extending in the center distance of the poles 12,14 or 10,12. The distance between the different poles can be increased or reduced by using different lengths of shaft and housing. The rotary movement of the shaft 28 allows a significant reduction in the size of the housing while retaining a rigid connection between the different poles. The modular system according to the invention facilitates assembly which can be carried out on site. In this case, the poles are factory fitted, the attachment to the beam 16 and the connection by bar sections 32, 34 and casing sections 46, 48 being carried out on site by simply fitting the bar sections into the hubs. 42 and connection of the casing sections 46, 48 by the connection flanges 50. The same circuit breaker can be equipped at the request of the user with different control members by simply replacing the box 68.

Claims (4)

1. Operating device of an electric apparatus, particularly of a multi-pole high voltage self-blast circuit-breaker, having spaced apart poles (10, 12, 14) mounted on a frame (16) along a line, each pole having a column shaped enclosure filled with a gas of high dielectric strength and a contact actuating rod (26), the contact rods (26) of all poles being linked by cranks (24) to a common operating shaft (28) located inside an air-tight case (46, 48) communicating with the pole enclosures, one (30) shaft (28) end passing through the case wall in an air-tight manner, for connection to an operating device (68) located outside the case, characterized in that said operating shaft (28) is a rotating shaft on which said cranks (24) are secured so as to move in planes perpendicular to the shaft (28) and that said case (46,48) comprises cylindrical sections, coaxially surrounding with little play the rotating shaft (28) to form a communication between said enclosures mounted on said hole beam shaped frame, wherein said case is disposed.

2. Operating device according to Claim 1, characterized in that said rotating shaft (28) comprises alined sections (32,34) extending between two pole (10, 12, 14) axes and being secured to the following section by the crank (24) hub in which the abutted grooved ends of successive sections (30, 36) are engaged.

3. Device according to Claim 2, characterized in that said alined cylindrical sections (46, 48) extend between two pole axes (10,12,14) and fit, in an air-tight manner, on the base of the pole enclosure shaped as a crank (24) case (22).

4. Operating device according to Claim 1, 2 or 3, characterized in that it forms a modular system having standard operating shaft (32, 34) sections and case (46, 48) sections to connect any number of poles (10, 12, 14).

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