Medium voltage electrical device

Abstract

A medium voltage electrical device (100) is proposed, comprising:-a wall (20) configured to be at a first potential (V1),-an electrical conductor (2) configured to be at a second potential (V2) different from the first potential (V1),-a tube (1) passing through the wall (20) and surrounding the electrical conductor (2),-a sleeve (3) made of an insulating material, where the sleeve (3) surrounds the tube (1) and is in contact with an outer surface (4) of the tube (1).

Description

Technical Field

[0001] This invention relates to the field of medium-voltage electrical equipment, in other words, electrical equipment with a nominal operating voltage between 1 kV and 52 kV.

[0002] These devices form part of a medium-voltage electrical distribution network. Background Technology

[0003] A known practice is to place certain electrical components (such as fuse holders or bushings) in a pressurized container containing an electrically insulating gas (such as sulfur hexafluoride). This gas, with its excellent dielectric properties, ensures electrical insulation and prevents arcing between the various electrical conductors present within the container. However, it also has a high global warming potential, making its use undesirable. Therefore, gases with low global warming potential, such as air, nitrogen, or carbon dioxide, can be used as alternatives. These gases do not have the same dielectric properties as their substitutes. Insulation can be improved by increasing the pressure of the gas contained within the container. However, a significant increase in pressure requires a reinforced container structure to prevent excessive deformation. Furthermore, a reduction in the size of the installation is desired, necessitating closer proximity of the electrical conductors, thus increasing dielectric stress. The pressure increase may not be sufficient to achieve the desired performance levels.

[0004] Therefore, there is a need to provide medium-voltage electrical equipment with improved dielectric insulation, especially regarding fuse holders or bushings. Summary of the Invention

[0005] Therefore, the present invention provides a medium-voltage electrical device, comprising:

[0006] - A wall, which is configured to be at a first potential.

[0007] - An electrical conductor configured to be at a second potential different from the first potential.

[0008] A tube, made of insulating material, passes through a wall and surrounds an electrical conductor.

[0009] - A sleeve, which is made of insulating material.

[0010] The sleeve surrounds the tube and contacts the outer surface of the tube.

[0011] The sleeve reduces dielectric stress on the surface of the tube near the wall, thus improving the voltage withstand capability of the electrical equipment.

[0012] The features listed in the following paragraphs can be implemented independently of each other or in any technically feasible combination:

[0013] The wall can form part of a container that includes a portion of an electrical conductor, a portion of a tube, and a sleeve.

[0014] The walls are made of metal.

[0015] The first potential is, for example, the ground (or earth) potential.

[0016] The second potential is, for example, the phase potential of a medium-voltage three-phase network. Therefore, the second potential corresponds to the high voltage of the network.

[0017] According to one example of the embodiment, an electrical conductor passes through a wall.

[0018] The tube is cylindrical.

[0019] The tube is made of electrically insulating material.

[0020] The tubes are made of, for example, epoxy resin or engineering thermoplastics.

[0021] The tube and the electrical conductor are coaxial.

[0022] The sleeve is cylindrical.

[0023] The container can be sealed. The container can contain gas at a pressure greater than atmospheric pressure.

[0024] According to one aspect of the electrical equipment, the sleeve includes:

[0025] - The first part, which contacts the outer surface of the tube, has a shape complementary to the outer surface of the tube.

[0026] - The second part extends in the axial direction and is a certain distance away from the outer surface of the tube.

[0027] The shape of the sleeve allows for an increase in the distance along the path of the sleeve, and thus enhances the dielectric insulation.

[0028] According to one embodiment, the first portion of the sleeve has a cylindrical shape.

[0029] The tube can have a rotationally symmetric cylindrical shape in the region that contacts the sleeve. In this case, the first part of the sleeve itself also has a rotationally symmetric cylindrical shape.

[0030] The radial inner surface of the first part is in contact with the outer surface of the tube.

[0031] According to one embodiment, the entire radial inner surface of the first portion is in contact with the outer surface of the tube.

[0032] According to one embodiment of the electrical equipment, the second portion has a flared shape, and the second portion expands between the region where it engages with the first portion and the free end of the second portion.

[0033] According to an example of an embodiment, the second part has a flared shape, and the radial distance between the second part and the outer surface of the tube increases as the axial distance between the second part and the first part increases.

[0034] According to a particular embodiment, the second portion of the sleeve has a conical shape.

[0035] The generatrix of the second part of the cone shape forms an angle between 15° and 70° with the axis of the cone.

[0036] The first part of the cylindrical shape and the second part of the conical shape can be coaxial.

[0037] According to one embodiment, the first portion of the sleeve extends axially along a length between 10% and 50% of the diameter of the first portion.

[0038] According to one embodiment, the second portion of the sleeve extends axially along a length between 10% and 30% of the diameter of the first portion.

[0039] According to one embodiment of the electrical equipment, the second portion of the sleeve has a substantially cylindrical shape, and the inner diameter of the second portion is larger than the outer diameter of the tube.

[0040] According to one embodiment of the electrical equipment, the sleeve contacts the wall.

[0041] The cylindrical portion of the sleeve includes an axial surface, and the axial surface contacts the wall.

[0042] According to one embodiment, the sleeve is made of an elastomer.

[0043] According to one aspect of the electrical equipment, the sleeve is subjected to radial pressure.

[0044] The radial extension of the sleeve is between 5% and 12%.

[0045] The outer surface of the tube includes a receiving portion for receiving the sleeve. The receiving portion has a roughness of less than 0.8 micrometers.

[0046] The radial inner surface of the first part of the sleeve has a roughness of less than 0.8 micrometers.

[0047] According to one embodiment of the electrical equipment, the first portion of the sleeve includes a groove open on the axial surface of the first portion.

[0048] The axial surface of the cylindrical portion of the sleeve includes a first radial inner portion and a second radial outer portion.

[0049] The first and second portions of the axial surface are separated by a groove.

[0050] The groove has a ring shape.

[0051] The groove and the cylindrical part of the sleeve can be coaxial.

[0052] The groove extends axially along a length between 5% and 15% of the diameter of the first part of the sleeve.

[0053] With the sleeve in a free state, the groove extends radially along a distance between 4% and 10% of the diameter of the first part of the sleeve.

[0054] According to one embodiment, the bottom of the groove has a circular shape.

[0055] The bottom of the groove is basically in the shape of a semi-circular torus.

[0056] According to one embodiment, the groove includes an electrically semiconductor material.

[0057] For example, the groove is coated with an electro-semiconductor coating.

[0058] Electro-semiconductor coatings are coatings containing electro-semiconductor particles.

[0059] According to a variant embodiment of the electrical equipment, the groove is at least partially filled with an electrosemiconductor elastomer.

[0060] Electrosemiconductor elastomers are silicone resins containing electrosemiconductor particles.

[0061] The groove can be completely filled with an electrically conductive elastomer.

[0062] According to one embodiment of the electrical equipment, the first portion of the sleeve includes a set of conductive tabs extending in the direction of the wall and in contact with the wall.

[0063] The tabs extend axially from the axial surface of the first part of the sleeve.

[0064] Even when the axial surface of the sleeve is not fully pressed against the wall, the tabs can ensure electrical contact between the electrically conductive material of the groove and the wall.

[0065] According to one embodiment, the electrical device includes a conductive rod extending from the wall toward the bottom of the recess, the conductive rod being in contact with an electrical semiconductor material of the recess.

[0066] Even when the axial surface of the sleeve is not fully pressed against the wall, the conductive rod can still ensure electrical contact between the semiconductor material of the wall and the groove.

[0067] The conductive rod can be a metal screw that passes through the wall.

[0068] In the case of a fuse holder, the electrical conductor includes the fuse.

[0069] The first terminal of the fuse is received in the first socket connected to the first rod portion of the electrical conductor.

[0070] The second terminal of the fuse is received in a second socket connected to the second rod portion of the electrical conductor.

[0071] According to one embodiment, the electrical equipment is configured to circulate current in a medium-voltage electrical network comprising three phases.

[0072] The electrical equipment includes, for each phase, the following:

[0073] - An electrical conductor, arranged in a container.

[0074] - A tube, which passes through the wall and surrounds the electrical conductor.

[0075] - A sleeve that surrounds the outer surface of the tube. Attached Figure Description

[0076] Other features, details, and advantages will become apparent from reading the following detailed description and studying the accompanying drawings, in which:

[0077] Figure 1 The diagram schematically depicts medium-voltage electrical equipment.

[0078] Figure 2 This is a perspective view of an electrical device according to an embodiment of the present invention.

[0079] Figure 2 These are partial views of an electrical device according to an embodiment of the present invention, taken from the side and in cross-section.

[0080] Figure 3 yes Figure 2 Another partial view of the electrical equipment in the middle, viewed from the side and in cross-section.

[0081] Figure 4 yes Figure 2 and Figure 3 Partial views of a variant embodiment of the electrical equipment in the diagram, taken from the side and in cross-section.

[0082] Figure 5 yes Figure 2 and Figure 3 A perspective view of the insulating sleeve of the electrical equipment in the image.

[0083] Figure 6 yes Figure 5 Perspective cross-sectional view of the insulating sleeve in the middle.

[0084] Figure 7 yes Figure 2 and Figure 3 A partial sectional view of a variant embodiment of the electrical equipment in the diagram. Detailed Implementation

[0085] To make the accompanying drawings easier to read, various elements are not necessarily shown to scale. In these drawings, the same elements have the same reference numerals. Some elements or parameters may be given ordinal numbers, that is, designated as, for example, first element or second element, or first parameter and second parameter, etc. The purpose of this ordinal numbering is to distinguish similar but not identical elements or parameters. This ordinal numbering does not imply any priority given to one element or parameter relative to another, and the names are interchangeable. When a given element is included in a designated device, this does not exclude the presence of other elements in that device.

[0086] Figure 1 An electrical device 100 is depicted, configured to circulate current in a medium-voltage electrical network. The electrical network comprises three phases, denoted as Ph1, Ph2, and Ph3.

[0087] Electrical equipment 100 includes, for each of phases Ph1, Ph2, and Ph3:

[0088] - Electrical conductors 2, 2', 2" are arranged in container 30.

[0089] Pipes 1, 1', and 1' pass through wall 20 and surround electrical conductors 2, 2', and 2'', respectively.

[0090] - Sleeves 3, 3', 3” surround the outer surfaces 4, 4' of tubes 1, 1', 1”.

[0091] Therefore, each of the phases Ph1, Ph2, and Ph3 of the electrical equipment 100 includes electrical conductors 2, 2', and 2" arranged in pipes 1, 1', and 1" and passing through the wall 20. Sleeves 3, 3', and 3" are respectively arranged on the corresponding pipes 1, 1', and 1"".

[0092] Especially Figure 2 As shown, the proposed medium-voltage electrical equipment 100 includes:

[0093] - Wall 20, which is configured to be at a first potential V1.

[0094] - Electrical conductor 2, which is configured to be at a second potential V2, different from the first potential V1.

[0095] - A tube 1, made of insulating material, passes through the wall 20 and surrounds the electrical conductor 2.

[0096] - Sleeve 3, which is made of insulating material.

[0097] The sleeve 3 surrounds the tube 1 and contacts the outer surface 4 of the tube 1.

[0098] The sleeve 3 reduces the dielectric stress on the surface of the tube 1 near the wall 20, thus improving the voltage withstand capability of the electrical equipment 100.

[0099] The wall 20 may form part of the container 30, which includes part of the electrical conductor 2, part of the tube 1, and the sleeve 3.

[0100] Wall 20 is made of metal.

[0101] The first potential V1 is, for example, the ground potential, and can also be referred to by the term "ground".

[0102] The second potential V2 is, for example, the phase potential of a medium-voltage three-phase network. Therefore, the second potential corresponds to the high voltage of the network.

[0103] exist Figure 2 In the diagram, potentials V1 and V2 are represented by dashed lines.

[0104] Electrical conductor 2 passes through wall 20.

[0105] Tube 1 is cylindrical.

[0106] Pipe 1 extends along axis D1.

[0107] Tube 1 is made of electrically insulating material.

[0108] Tube 1 is made of, for example, epoxy resin or engineering thermoplastic.

[0109] Pipe 1 and conductor 2 are coaxial.

[0110] The internal volume of tube 1 forms a volume for receiving electrical conductor 2.

[0111] Sleeve 3 is cylindrical.

[0112] Sleeve 3 extends along axis D3.

[0113] Sleeve 3 and tube 1 are coaxial.

[0114] Container 30 may be sealed. Container 30 may contain gas at a pressure greater than atmospheric pressure.

[0115] The gas can be air. The gas can be a dielectric gas, such as sulfur hexafluoride.

[0116] In the example shown, tube 1 corresponds to the fuse holder.

[0117] Therefore, tube 1 includes a fuse 25 through which current flows. The fuse 25 is selected such that it melts when the current intensity exceeds a predetermined threshold, thereby interrupting the current circulation in the event of an overcurrent and thus protecting the circuit.

[0118] Figure 2The arrangement of electrical equipment 100 is described in detail when the conduit 1 is a fuse holder. In this application example, the conductor 2 includes a fuse 25. In other words, the fuse 25 forms part of the conductor 2 arranged in the conduit 1.

[0119] The tube 1 includes a first connector 22A at its first axial end, which is electrically connected to a first socket 24A that receives a first connection terminal of the fuse 25. The first rod portion of the conductor 2 is connected to the first connector 22A.

[0120] The first terminal of the fuse 25 is thus received in the first socket 24A connected to the first rod portion of the electrical conductor 2.

[0121] The tube 1 includes a second connector 22B that is electrically connected to a second socket 24B that receives the second connection terminal of the fuse 25. A second rod portion of the conductor 2 is connected to the second connector 22B. The second terminal of the fuse 25 is thus received in the second socket 24B connected to the second rod portion of the conductor 2.

[0122] The first socket 24A and the second socket 24B are conductive and, for example, made of metal. The first socket 24A and the second socket 24B are spaced apart from each other. Current can travel from the first socket 24A to the second socket 24B simply by passing through the fuse 25.

[0123] The first socket 24A and the second socket 24B thus form part of the conductor 2 arranged in the tube 1.

[0124] The reference numeral i1 schematically depicts the path of current from the input connector 21 to the portion of the conductor 2 connected to the second connector 22B.

[0125] When the cover 13 is in the closed position, the cover 13 allows the axial end of the fuse holder to be closed. The cover 13 can be opened to provide access to the fuse 25, for example, to insert the fuse 25 or to replace the fuse 25 if necessary. In the closed position, the cover 13 abuts against the electrical insulator 14, which itself abuts against the second socket 24B.

[0126] exist Figure 2 In the accompanying drawings, reference numerals 22A' and 22B' denote the first and second connectors of the tube 1' corresponding to the second phase of the electrical equipment 100. A sleeve surrounding the tube 1' is indicated by reference numeral 3'. The sleeve 3' contacts the outer surface 4' of the tube 1'.

[0127] The tube corresponding to the third phase is not shown.

[0128] The three tubes are arranged in the electrical equipment 100 in a manner that minimizes the overall volume and dielectric stress.

[0129] According to the example shown, corresponding to the fuse holder, the electrical conductor 2 is a certain distance away from the inner surface 5 of the tube 1.

[0130] According to another example of the embodiment (not shown), the electrical conductor 2 is in contact with the inner surface 5 of the tube 1.

[0131] This situation can correspond to, for example, a bushing. Tube 1 can be molded over the outer side surface of the electrical conductor 2.

[0132] In the case of a bushing, the electrical conductor 2 passes through the tube 1 from the first axial end to the second axial end of the tube 1.

[0133] The electrical conductor 2 includes a rigid rod made of copper. The rigid rod is solid.

[0134] For example in Figure 3 and Figure 4 As described in detail, sleeve 3 includes:

[0135] - A first portion 7 that contacts the outer surface 4 of the tube 1, the first portion 7 having a shape complementary to the outer surface 4 of the tube 1.

[0136] - The second part 8 extends from the first part 7 along the axial direction, and the second part 8 is a certain distance away from the outer surface 4 of the tube 1.

[0137] The shape of the sleeve allows for an increase in the distance along the path of sleeve 4, and thus reduces dielectric stress.

[0138] In this case, the first part 7 of the sleeve 3 has a cylindrical shape.

[0139] In the example shown, the tube 1 is a cylindrical shape with rotational symmetry in the region that contacts the sleeve 3. The first part 7 of the sleeve 3 is also a cylindrical shape with rotational symmetry.

[0140] Therefore, the first part 7 of the sleeve 3 can fit tightly against the outer surface 4 of the tube 1.

[0141] In other words, the radial inner surface 9 of the first part 7 is in contact with the outer surface 4 of the tube 1.

[0142] According to the example shown, the entire radial inner surface 9 of the first part 7 is in contact with the outer surface 4 of the tube 1.

[0143] Reference numeral 6 in the figure indicates the area where the outer surface 4 of the tube 1 contacts the first part 7 of the sleeve 3.

[0144] According to the specific Figure 2 and Figure 3In an embodiment of the electrical device 100 shown, the second portion 8 has a flared shape. The second portion 8 widens between the region where it engages with the first portion 7 and the free end of the second portion 8.

[0145] The second part 8 has a flared shape, and the radial distance between the second part 8 and the outer surface 4 of the tube 1 increases as the axial distance between the second part 8 and the first part 7 increases.

[0146] The radial inner surface 10 of the second part 8 faces the outer surface 4 of the tube 1 in the radial direction R.

[0147] Surface 10 includes a first portion 10-1 extending from surface 9 and a second portion 10-2 extending from the first portion 10-1.

[0148] According to in particular Figure 2 and Figure 3 In the embodiment shown, the second part 8 of the sleeve 3 has a conical shape.

[0149] The generatrix G of the second part 8 of the cone shape forms an angle α with the axis D8 of the cone, which is between 15° and 70°.

[0150] The first cylindrical part 7 and the second conical part 8 are coaxial.

[0151] The axis of the first part 7 is represented by D7, and the axis of the second part 8 is represented by D8. According to the example shown, especially... Figure 5 In the middle, these two axes coincide, and also coincide with the axis D3 of sleeve 3.

[0152] like Figure 6 and Figure 7 As shown, the first portion 7 of the sleeve 3 extends axially along a length L1, which is between 10% and 50% of the diameter di7 of the first portion 7.

[0153] The second part 8 of the sleeve 3 extends axially along a length L2, which is between 10% and 30% of the diameter di7 of the first part 7.

[0154] Lengths L1 and L2 are measured along the axis D3 of sleeve 3.

[0155] Figure 4 An embodiment of electrical equipment 100 is shown, wherein the second portion 8 of the sleeve 3 is not conical.

[0156] According to this embodiment, the second part 8 of the sleeve 3 has a generally cylindrical shape, and the inner diameter of the second part 8 is larger than the outer diameter of the tube 1.

[0157] Basically, the cylindrical shape means that small angles are possible, corresponding to the draft angle that allows the sleeve 3 to be easily demolded when molding the sleeve 3.

[0158] according to Figures 2 to 4 In the embodiment shown, the sleeve 3 is in contact with the wall 20.

[0159] Sleeve 3 covers the area forming the interface between tube 1 and wall 20. The shape of sleeve 3 allows it to act as a deflector of electric field lines and reduces dielectric stress.

[0160] The cylindrical portion 7 of the sleeve 3 includes an axial surface 11, and the axial surface 11 contacts the wall 20.

[0161] Sleeve 3 is made of an elastomer.

[0162] Sleeve 3 is formed, for example, by injection molding.

[0163] Sleeve 3 is subjected to radial pressure.

[0164] The radial extension of sleeve 3 is between 5% and 12%. This radial extension is selected based on the elasticity of the elastomer.

[0165] The radial extension of sleeve 3 is defined by the following formula:

[0166] When the sleeve 3 is in a free state, the difference between the outer diameter de1 of the tube 1 and the inner diameter di7 of the first part 7 of the sleeve 3 is divided by the outer diameter de1 of the tube 1.

[0167] "Free state" refers to the state where sleeve 3 is not installed on pipe 1 and has not been deformed. Therefore, the state before installation is the free state, and sleeve 3 is not deformed.

[0168] The outer surface 4 of tube 1 includes a receiving portion 6 for receiving sleeve 3.

[0169] The receiving part is the portion of the outer surface 4 that contacts the radial inner surface 9 of the sleeve 3.

[0170] The receiving part 6 has a roughness Ra of less than 0.8 micrometers.

[0171] Roughness Ra is measured according to standard ISO 10110-8.

[0172] The radial inner surface 9 of the first part 7 of the sleeve 3 also has a roughness Ra of less than 0.8 micrometers.

[0173] Therefore, the sleeve 3 is subjected to sufficient stress, and the contact surfaces 6 and 9 are smooth enough to ensure that there is no air gap at the interface between the sleeve 3 and the pipe 1. In other words, the low roughness of the contact surfaces 6 and 9 and the stress on the sleeve 3 when it is placed on the pipe 1 mean that air molecules are expelled from the interface between the contacting parts when the sleeve 3 is placed around the pipe 1.

[0174] According to the example shown, the first portion 7 of the sleeve 3 includes an open groove 15 on the axial surface 11 of the first portion 7.

[0175] Especially in Figure 6 As can be seen, the axial surface 11 of the cylindrical portion 7 of the sleeve 3 includes a first radial inner portion 11-1 and a second radial outer portion 11-2.

[0176] The first portion 11-1 and the second portion 11-2 of the axial surface 11 are separated by the groove 15.

[0177] The groove 15 has an annular shape.

[0178] In this case, the groove 15 and the cylindrical portion 7 of the sleeve 3 are coaxial.

[0179] The first portion 11-1 of the axial surface 11 has a constant width. This width is measured in the radial direction.

[0180] The second portion 11-2 of the axial surface 11 also has a constant width. The width is measured in the radial direction.

[0181] The width of the first part 11-1 can be equal to the width of the second part 11-2.

[0182] Groove 15 along Figure 7 The length L3, schematically shown, extends axially and is between 5% and 15% of the diameter di7 of the first portion 7 of the sleeve 3.

[0183] With the sleeve 3 in a free state, the groove 15 extends radially along a distance L4 between 4% and 10% of the diameter di7 of the first part 7 of the sleeve 3.

[0184] The groove 15 includes a bottom 16. The bottom 16 of the groove 15 has a circular shape.

[0185] The bottom 16 of the groove 15 is basically in the shape of a semi-circular torus.

[0186] The axis of the semi-circular toroidal surface coincides with the axis of the second part 8 of the sleeve 3.

[0187] According to one embodiment, such as Figure 5 and Figure 6 As shown, the groove 15 includes an electrical semiconductor material.

[0188] For example, the groove 15 is coated with an electro-semiconductor coating.

[0189] Electro-semiconductor coatings are coatings containing semiconductor particles.

[0190] The entire surface of the groove 15 (in other words, the portion between the first portion 11-1 of the axial surface 11 and the second portion 11-2 of the axial surface 11) is coated with an electro-semiconductor coating.

[0191] The material used to form the groove 15 can be surface treated to enhance the adhesion of the electro-semiconductor coating.

[0192] According to a variant embodiment of the electrical device 100, the groove 15 is at least partially filled with an electrosemiconductor elastomer.

[0193] In this case, the electrosemiconductor elastomer can be a silicone resin containing electrosemiconductor particles.

[0194] The groove 15 can be completely filled with an electrically conductive elastomer.

[0195] The radial inner surface 9 of the first portion 7 of the sleeve 3 does not have any electrically conductive semiconductor material. In other words, the semiconductor material deposited on the wall of the groove is not deposited on the portion of the sleeve that contacts the outer surface 4 of the tube 1.

[0196] Similarly, the outer surface of part 7 is insulating and does not contain any semiconductor material. The same applies to part 8.

[0197] During the application of electrosemiconductor coatings or electrosemiconductor elastomers, the radial inner surface 9 and the outer side surface may be temporarily masked with a protective film to prevent the application of the compound during spraying or running. The protective film is then removed to obtain the final part.

[0198] according to Figure 7 In one embodiment of the electrical device 100 shown, the first portion 7 of the sleeve 3 includes a set of conductive tabs 12 that extend in the direction of the wall 20 and contact the wall 20.

[0199] The tab 12 extends axially from the axial surface 11 of the first part 7 of the sleeve 3.

[0200] The tab 12 ensures electrical contact between the semiconductor material of the groove 15 and the wall 20, even when the axial surface 11 of the sleeve 3 is not fully pressed against the wall 20.

[0201] Specifically, the length of the tab 12 is greater than the maximum axial clearance that may exist between the sleeve 3 and the wall 20.

[0202] according to Figure 3 and Figure 4 In one embodiment, the electrical device 100 includes a conductive rod 19 extending from the wall 20 toward the bottom 16 of the recess 15, the conductive rod 19 being in contact with an electrical semiconductor material of the recess 15.

[0203] The conductive rod 19 ensures electrical contact between the wall 20 and the semiconductor material of the groove 15, even when the axial surface 11 of the sleeve 3 is not fully pressed against the wall 20.

[0204] Conductive rod 19 in Figure 3 and Figure 4 As can be seen in the text.

[0205] The conductive rod 19 can be a metal screw that passes through the wall 20.

[0206] The length and diameter of the screw are selected to ensure proper contact with the wall of the groove 15.

Claims

1. Medium-voltage electrical equipment (100), including: - Wall (20), which is configured to be at a first potential (V1). - An electrical conductor (2) is configured to be at a second potential (V2) different from the first potential (V1). - A tube (1) that passes through the wall (20) and surrounds the electrical conductor (2). - Sleeve (3), which is made of insulating material The sleeve (3) surrounds the tube (1) and contacts the outer surface (4) of the tube (1).

2. The electrical equipment according to claim 1, wherein, The sleeve (3) includes: - A first portion (7) that contacts the outer surface (4) of the tube (1), the first portion (7) having a shape complementary to the outer surface (4) of the tube (1). - A second part (8) extends the first part (7) in the axial direction, and the second part (8) is a certain distance away from the outer surface (4) of the tube (1).

3. The electrical equipment according to claim 2, wherein, The second part (8) has a flared shape, and the second part (8) is widened between the region where it joins the first part (7) and the free end of the second part (8).

4. The electrical equipment according to claim 3, wherein, The second part (8) of the sleeve (3) has a conical shape.

5. The electrical equipment according to any one of the preceding claims, wherein, The sleeve (3) is in contact with the wall (20).

6. The electrical apparatus according to any one of the preceding claims, wherein, The sleeve (3) is made of an elastomer.

7. The electrical equipment according to any one of the preceding claims, wherein, The sleeve (3) is radially pressurized.

8. The electrical equipment according to any one of the preceding claims in conjunction with claim 2, wherein, The first portion (7) of the sleeve (3) includes an open groove (15) on the axial surface (11) of the first portion (7). The groove (15) comprises an electrical semiconductor material.

9. The electrical equipment according to claim 8, wherein, The groove (15) is coated with an electro-semiconductor coating.

10. The electrical equipment according to any one of claims 8 and 9, wherein, The groove (15) is at least partially filled with an electrosemiconductor elastomer.

11. The electrical device according to any one of the preceding claims in conjunction with claim 2, wherein, The first portion (7) of the sleeve (3) includes a set of tabs (12) extending along the direction of the wall (20) and contacting the wall (20).

12. The electrical equipment according to claim 11, wherein, The tab (12) extends axially from the axial surface (11) of the first portion (7) of the sleeve (3).

13. The electrical device according to any one of claims 8 to 10, comprising a conductive rod (19) extending from the wall (20) toward the bottom of the recess (15), the conductive rod (19) being in contact with the electrical semiconductor material of the recess (15).

14. The electrical device according to any one of the preceding claims, configured to circulate current in a medium-voltage electrical network comprising three phases (Ph1, Ph2, Ph3), The electrical equipment (20) includes, for each of the phases: - Electrical conductors (2, 2', 2"), which are arranged in the container (30), - A tube (1, 1', 1"), which respectively passes through the wall (20) and surrounds the electrical conductor (2, 2', 2"), - A sleeve (3, 3', 3") surrounds the outer surface of the tube (1, 1', 1").

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