FR3049399A1 - ELECTRICAL CONNECTOR FOR FORMING AN ANNULAR / SPHERICAL CONNECTION WITH AN ELECTRICAL DEVICE - Google Patents

Abstract

The invention relates to an electrical apparatus (1) for medium or high voltage electrical line, comprising a first electrical apparatus (2), a second electrical apparatus (3), and an electrical connector (4) for electrically connecting the first apparatus (2). ) to the second apparatus (3). The connector (4) comprises a first connecting portion (47) configured to be mechanically and electrically connected to one of the first apparatus (2) and the second apparatus (3) in an annular connection. The connector (4) comprises a second connecting portion (49) configured to be mechanically and electrically connected to the other apparatus (2, 3) in a ball joint or an annular connection.

Description

ELECTRICAL CONNECTOR FOR FORMING AN ANNULAR / SPHERICAL CONNECTION WITH AN ELECTRICAL DEVICE

DESCRIPTION

TECHNICAL FIELD The invention relates to electrical equipment for medium or high voltage electricity conduction line, for example 50 kV or above. It relates in particular to Posts Under Metal Envelopes insulated with gas, also known by the acronym of PSEM.

Such a gas insulated substation is also known in English as "Gas Insulated Switchgear". It includes electrical equipment such as disconnector, circuit breaker, transformer and / or busbar sets.

This electrical equipment is surrounded by a sealed envelope containing a dielectric gas such as SF6, to isolate them electrically from the metal shell which is at ground potential.

STATE OF THE PRIOR ART

FIG. 1 represents a gas-insulated voltage transformer 1, which comprises a high-voltage conductor 20, a connection terminal 30 to a primary winding of the transformer, and an electrical connector 4 electrically and mechanically connecting the conductor 20 to the connection terminal 30.

The connector 4 comprises a first end portion 41 screwed to the conductor 20, a second end portion 45 secured to the connection terminal 30, and a deformable portion 42 between the end portions 41, 45.

The connector 4 is movable in translation along the axis 23 of the conductor 20, because of the screwed portion 41. It is also rotatable about this axis 23 by elastic deformation of the deformable portion 42.

However, the deformable portion 42 can deform plastically, when excessive mechanical forces are exerted on the connector 4 in a transverse direction of the apparatus 1.

These forces are exerted especially when the connection terminal 30 moves relative to the high voltage conductor 20 with a radial component relative to the axis 23 of the conductor too large, or during shocks to the voltage transformer 1.

DISCLOSURE OF THE INVENTION The invention aims to remedy this drawback. In this regard, the invention relates to an electrical apparatus for medium or high voltage electrical line, comprising a first electrical appliance, a second electrical appliance, and an electrical connector for electrically connecting the first appliance to the second appliance.

According to the invention, the electrical connector comprises a first connecting portion configured to be mechanically and electrically connected to one of the first apparatus and the second apparatus, in an annular connection, and a second link portion configured to be mechanically connected and electrically to the other device, according to a ball joint connection or an annular connection. The apparatus limits the deteriorations experienced by the electrical connector when it is subjected to mechanical forces in a transverse direction of the apparatus, in particular during major shocks or transverse displacements of the first apparatus relative to the second apparatus.

Advantageously, the electrical equipment comprises a voltage transformer.

Advantageously, the first apparatus comprises a transformer cone electrode to which the first connecting portion is mechanically and electrically connected.

Advantageously, the second apparatus comprises a transformer primary winding electrical connection terminal to which the second connecting portion is mechanically and electrically connected.

Advantageously, the first connecting portion comprises a ring of conductive fingers and / or the second connecting portion comprises a ring of conductive fingers.

Advantageously, the first connecting portion and / or the second connecting portion comprise an outer surface that is at least partially spherical.

Advantageously, the first link portion is configured to be inserted into a substantially cylindrical inner side surface hole of the first apparatus, and / or the second link portion is configured to be inserted into a substantially cylindrical inner side surface hole of the second apparatus .

Advantageously, the connector comprises an electrically conductive rod which extends at least from the first portion to the second portion. The invention also relates to a method of electrical connection of a first electrical appliance to a second electrical appliance by an electrical connector of an appliance as defined above.

Advantageously, the first device is brought closer to the second device, so that the first connecting portion is mechanically and electrically connected to the first device in an annular connection, once the second connecting portion has been electrically and mechanically connected to the second apparatus.

BRIEF DESCRIPTION OF THE DRAWINGS

Figure 1 already described is a partial schematic representation in elevation of an electrical apparatus of known structure;

Figure 2 is a partial schematic representation in longitudinal section of the apparatus, according to a first embodiment; Figure 3 is a partial schematic representation in longitudinal section of the apparatus, during a misalignment within the apparatus; Figure 4 schematically illustrates in longitudinal section an electrical connection of two apparatus of the apparatus.

DETAILED PRESENTATION OF PARTICULAR EMBODIMENTS

FIG. 2 represents a gas-insulated electrical apparatus 1 for a medium or high voltage electrical line, according to a first embodiment. The apparatus 1 is a voltage transformer, that is to say a measurement transformer. It comprises a first electrical appliance 2, a second electric appliance 3 and an electrical connector 4 for mechanically and electrically connecting the first appliance 2 to the second appliance 3. The appliance 1 comprises a casing 5 which surrounds the electrical appliances 2 and 3, as well as that the connector 4. The casing 5 is made of gas-tight metal material and is at the potential of the earth. The envelope 5 delimits a cavity 6 which is filled with dielectric gas such as SF6.

The first apparatus 2 comprises a first high-voltage conductor 20. It is substantially symmetrical about a longitudinal axis 23, said first longitudinal axis 23.

The second apparatus 3 comprises a connection terminal 30 to a primary winding of the transformer. The second apparatus 3 is substantially symmetrical in revolution about a longitudinal axis 33, said second longitudinal axis 33. The apparatus 1 is shown in FIG. 2 in a rest situation in which the first axis 23 and the second axis 33 are substantially parallel and coincident, to define a longitudinal axis of the apparatus 1.

In the continuation of the description and unless otherwise stated, a longitudinal direction refers to the direction of the longitudinal axis of the apparatus, a radial direction is a direction orthogonal to this axis, and a transverse direction is a direction having a radial component.

The second apparatus comprises the first high voltage conductor 20, an insulating cone 22 and a downstream portion 24.

The first conductor 20 is a cone electrode. The first conductor 20 has an annular ring shape and has a first bore 7 for receiving a portion of the connector 4.

The cone 22 is located around the first conductor 20 and is supported on an annular rim of the casing 5 which it is rigidly secured.

The cone 22 makes it possible to keep the first conductor 20 and the downstream part under tension 24, ensuring their dielectric strength with respect to the envelope 5.

The downstream portion 24 is electrically conductive. It is located opposite the first conductor 20 relative to the second apparatus 3 along the first axis 23, being electrically and mechanically secured to the first conductor 20. The downstream portion 24 serves to connect the transformer 1 to another electrical equipment (not shown) such as a disconnector.

The second apparatus 3 comprises the connection terminal 30 to a primary winding of the transformer, a dielectric cover 35, and an upstream portion 32.

The upstream portion 32 comprises a primary winding winding of the transformer 1.

The connection terminal 30 is rigidly secured to the upstream portion 32 and the dielectric cover 31. It is in electrical contact with the upstream portion 32 to electrically connect / disconnect it from the rest of the apparatus 1. The connection terminal 30 comprises a second bore 8 for receiving a portion of the connector 4.

The dielectric cover 35 ensures the dielectric strength of the upstream portion 32 and the connection terminal 30 vis-à-vis the envelope 5.

The electrical connector 4 is described below with reference to FIGS. 2 and 3.

The connector 4 comprises an electrically conductive rod, a first connecting portion 47 configured to be mechanically and electrically connected to the first device 2, and a second connecting portion 49 configured to be mechanically and electrically connected to the second device 3.

The connector 4 is substantially symmetrical in revolution with respect to a longitudinal axis 43 of the connector. It is also substantially symmetrical with respect to a median plane orthogonal to its longitudinal axis 43.

The rod 40 extends from a first end portion 41, to which it has a rounded, to a second end portion 45 which also has a rounded. The two end portions 41, 45 are substantially identical.

The roundings of the rod 40 serve to facilitate the insertion of the rod 40 into the bores 7, 8 of the first and second apparatus 2, 3.

The rod 40 has a first groove 46 near the first end portion 41, to accommodate the first connecting portion 47. The first groove 46 is located between a central portion 44 of the rod and the first end portion 41 .

It also comprises a second groove 48 near the second end portion 45, to accommodate the second connecting portion 49. The second groove 48 is located between a central portion 44 of the rod and the second end portion 45. The two grooves 46 and 48 are substantially identical.

The first connecting portion 47 comprises a ring of electrically conductive fingers which are spaced from each other in a circumferential direction of the connecting portion 47 about the axis 43 of the connector.

The first connecting portion 47 includes an outer surface, which is defined by the conductive fingers, having a truncated sphere shape.

The first connecting portion 47 and the second connecting portion 49 are of substantially identical structures.

The second connecting portion 49 comprises an electrically conductive finger ring which is spaced from each other in a circumferential direction of the connecting portion 49 about the longitudinal axis 43 of the connector.

The outer surface of the second connecting portion 49, which is defined by the conductive fingers, has a sphere shape truncated by two parallel planes.

With reference to FIG. 3, the first connecting portion 47 is inserted into the first bore 7 and the second connecting portion 49 is inserted into the second bore 8.

The first bore 7 has a rounding 73, a side wall 72 and a bottom wall 71. The side wall 72 and the bottom wall 71 define a cylindrical blind hole. The rounding 73 serves to facilitate the insertion of the first end portion 41 and the first connecting portion 47 into the bore 7.

The second bore 8 has a rounded 83, a side wall 82 and a bottom wall 81. The side wall 82 and the bottom wall 81 define a cylindrical blind hole. The rounding 83 serves to facilitate the insertion of the second end portion 45 and the second connecting portion 49 into the bore 8.

The second bore 8 has a shape substantially identical to that of the first bore 7. Nevertheless, the first bore 7 has a longer length along the first axis 23 than the second bore 8 along the second axis 33.

In the sectional plane shown in FIG. 3, the first connecting portion 47 is in contact with the lateral wall 72 at two points A and B. The first end portion 41 is at a distance and free from contact with the wall of FIG. background 71.

In the section plane shown in FIG. 3, the second portion 49 is in contact with the side wall 82 at two points C and D. The second end portion 45 is in mechanical and electrical contact with the bottom wall 81.

The first connecting portion 47 is in contact with the first bore 7 in a sphere-cylinder connection and forms an annular connection with the first bore 7.

The first connecting portion 47 has a degree of freedom in translation along the axis 23. It also has a degree of freedom in rotation about the first axis 23, a degree of freedom in rotation about a third axis Yi Yi orthogonal to the first axis, and a degree of freedom in rotation about a fourth axis Ζχ-Ζχ orthogonal to the first axis 23 and the third axis Υχ-Υχ.

The first connecting portion 47 has a translation degree of translation along the third axis Υχ-Υχ and a translation degree of translation along the fourth axis Ζχ-Ζχ.

The second connecting portion 49 is in contact with the second bore 8 in a ball joint connection.

The second connecting portion 49 has a degree of freedom in rotation about the second axis 33, a degree of freedom in rotation about a fifth axis Y2-Y2 orthogonal to the second axis 33, and a degree of freedom in rotation around a sixth axis Z2-Z2 orthogonal to the second axis 33 and the fifth axis Y2-Y2.

The second connecting portion 49 has a translation degree of translation along the second axis 33, a translation degree of translation along the fifth axis Y2-Y2 and a translation degree of translation along the sixth axis Z2-Z2.

The connector 4 is for example configured to mechanically and electrically connect the first device 2 to the second device 3, when they are angularly offset each by at most 4 ° with respect to the longitudinal axis of the apparatus 1. In FIG. 3, the first axis 23 is shifted transversely relative to the second axis 33. The longitudinal axis 43 of the connector is inclined relative to the first axis 23 and relative to the second axis 33 to electrically and mechanically connect the two devices 2, 3. The first connecting portion 47 has also moved along the first axis 23, with respect to the situation shown in FIG.

The method of electrical and mechanical connection of the first apparatus 2 to the second apparatus 3 is described with reference to FIG.

First, the second connecting portion 49 is inserted into the second bore 8 to form a ball joint with the second bore. The connecting portion 49 is then in mechanical and electrical contact with the second device 3. The longitudinal axis 43 of the connector 4 and the second axis 33 are substantially merged.

The first device 2 is then brought closer to the second device 3, so that the first axis 23 is substantially parallel to the second axis 33, preferably being substantially coincidental with the second axis 33. The rounding 73 cooperates with the rounding of the first end portion 41 for guiding the first end portion 41 and the first connecting portion 47 in the first bore 7. If necessary, the longitudinal axis 43 of the connector 4 inclines, so that the first connecting portion 47 is inserted into the first bore 7 to form an annular connection with the first bore 7.

The connector 4 then electrically and mechanically connects the first device 2 to the second device 3.

Due to the annular connection of the connector 4 with the first device 2 and the ball joint / annular connector 4 with the second device 3, the electrical connector 4 is unlikely to deteriorate when subjected to mechanical forces according to a transverse direction of the apparatus.

Of course, various modifications can be made to the above detailed discussion.

According to an alternative embodiment, the first connecting portion 47 and / or the second connecting portion 49 have a bore shape to cooperate with a male part of the first device 2 and / or the second device 3.

The first connecting portion 47 and / or the second connecting portion 49 may also be merged with the first end portion 41 and / or the second end portion 45.

In another variant, the first connecting portion 47 and / or the second connecting portion 49 are integral with the rod 40.

In a variant, the second connecting portion 49 forms an annular connection with the second bore 8, having a degree of freedom in translation along the second axis 33.

In another variant, the groove 46 for accommodating the first connecting portion 47 is formed in the side wall 72 of the first bore 7. Alternatively or additionally, the groove 48 for accommodating the second connecting portion 49 is formed in the side wall 82 of the second bore 8.

Claims (10)

An electrical apparatus (1) for a medium or high voltage electrical line, comprising: a first electrical apparatus (2), a second electrical apparatus (3), an electrical connector (4) for electrically connecting the first apparatus (2) to the second apparatus (3), characterized in that the electrical connector (4) comprises: a first connecting portion (47) configured to be mechanically and electrically connected to one of the first apparatus (2) and the second apparatus (3). an annular connection, a second connecting portion (49) configured to be mechanically and electrically connected to the other apparatus (2, 3) in a ball joint connection or an annular connection. 2. Apparatus (1) according to the preceding claim, wherein the apparatus (1) comprises a voltage transformer. 3. Apparatus (1) according to the preceding claim, wherein the first apparatus (2) comprises a transformer cone electrode (20) to which the first connecting portion (47) is mechanically and electrically connected. 4. Apparatus (1) according to one of the preceding claims, wherein the second connecting portion (49) is mechanically and electrically connected to an electrical connection terminal (30) primary transformer winding. 5. Apparatus (1) according to one of the preceding claims, wherein the first connecting portion (47) and / or the second connecting portion (49) comprise an outer surface at least partially spherical. 6. Apparatus (1) according to one of the preceding claims, wherein the first connecting portion (47) comprises a ring of conductive fingers and / or the second connecting portion (49) comprises a ring of conductive fingers. Apparatus (1) according to one of the preceding claims, wherein the first connecting portion (47) is configured to be inserted into a substantially cylindrical inner side surface hole (7) of the first apparatus (2), and or the second connecting portion (49) is configured to be inserted into a substantially cylindrical inner side surface hole (8) of the second apparatus (3). 8. Apparatus (1) according to any one of the preceding claims, wherein the connector (4) comprises a rod (40) electrically conductive which extends at least from the first portion (47) to the second portion (49) . 9. A method of electrical connection of a first electrical apparatus (2) to a second electrical apparatus (3) by an electrical connector (4) of an apparatus (1) according to any one of the preceding claims. 10. A method of connection according to the preceding claim, wherein the first device (2) is brought closer to the second device (3), so that the first connecting portion (47) is mechanically and electrically connected to the first device (2). ) according to an annular connection, once the second connecting portion (49) has been electrically and mechanically connected to the second apparatus (3).