CN102959816A - Bushing for an electrical apparatus in a metal casing and assembly for a ground isolator with improved mechanical retention - Google Patents

Abstract

Assembly for a ground isolator comprising a fixed contact (18) fixedly mounted in a bore (16) of a cap (6.2), the fixed contact (18) having a body of longitudinal axis (Y), a first longitudinal portion of which projects from the support and is connected to ground, the connection region between the first and second portions having a radial projection (26) comprising a first annular face (26.1) and a second annular face (26.2) that are inclined in relation to the longitudinal axis (Y). Electrical insulating means, for example in the form of two sleeves (38, 40), are mounted in the bore (16). The internal surface (42, 44) of the sleeves (38, 40) is shaped so as to bear flat against the first (26.1) and second (26.2) inclined faces, respectively, of the radial projection (26). A clamping plate (50) mounted on the cap (6.2) keeps the fixed contact (18) immobilized in the bore (16) via the sleeves (38, 40).

Description

Bushings for electrical equipment in metal housings and assemblies for isolators with improved mechanical retention

technical field

The present application mainly relates to a bushing for a medium-high voltage gas insulated switchgear, and in particular to a three-phase switchgear with a single housing and an earthing switch for use in said switchgear s component.

Background technique

Gas insulated switchgear is generally provided with a grounding switch for grounding the conductor inside the metal cladding to ensure the safety of operators during maintenance and testing of various parts of the switchgear.

Such a switch is known, for example, from document WO 2007/042548.

The switch includes a fixed ground contact that passes through the housing of the switchgear, the end of the ground contact on the outside of the housing is connected to the ground, and the end on the inside of the housing is connected to the ground by a movable contact. So-called phase contacts that are electrically connected to the conductive rods.

The fixed contacts must be mounted through the housing in such a way that leakage of dielectric gas is prevented under the pressure contained inside the housing; moreover, the fixed ground contacts are electrically isolated from the housing.

However, when the movable contact moves and penetrates into the phase contact, the contact is subjected to mechanical forces.

If the mechanical retention of the ground contact is insufficient, firstly said force will weaken the seal between the fixed ground contact and the housing, and secondly the guiding quality of the movable contact will be poor, which will lead to Premature wear and degradation of contacts.

In document WO 2007/042548 the fixed ground contact is mounted through the housing by means of an electrically insulating sleeve and a plate screw system is provided for retaining the fixed ground contact.

This installation is complex and places considerable mechanical and dielectric stress on the sleeve.

Document FR 1 413 462 describes a fixed contact mounted through a wall of a box that is electrically insulated with respect to said box. The installation requires a large number of parts.

It is therefore an object of the present application to provide an earthing switch assembly with hermetic mounting and ensuring good mechanical retention on the housing, and more generally to provide an earthing switch assembly with improved mounting tightness and improved mechanical retention on the housing. Bushings for retained gas insulated switchgear.

Contents of the invention

The above objects of the present application are achieved by a bushing for a gas insulated switchgear, more particularly by an earthing switch assembly having a fixed contact fixedly mounted in a hole in a support and comprising a an elongated body with a first longitudinal part protruding from the support designed, for example, to make an electrical connection to ground, and a second longitudinal part designed to be accommodated in a housing of the switchgear, the second The connection zone between the one part and the second part comprises a radial protrusion comprising a first annular surface and a second annular surface inclined with respect to said longitudinal axis.

Electrical insulating means, for example in the form of two sleeves, are mounted in said holes in order to insulate the fixed contacts of said support.

The inner side surface of the sleeve is shaped to bear against the first inclined surface and the second inclined surface of the radial protrusion respectively in a planar manner. A clamping plate mounted on the support portion retains the fixed contact in place in the hole through the sleeve.

Through the inclination of the face of the radial protrusion, the longitudinal clamping force exerted by the clamping plate is divided into an axial component and a radial component, thereby ensuring that the fixed contact is radially fixed in the support portion. Good retention both axially and axially.

The rigidity of the mechanical retention of the fixed contact in the housing is increased, which firstly avoids stress on the seal between the housing and the fixed contact and secondly ensures Very good guidance of the movable contacts on the contacts.

The installation elements are simple in structure and few in number. This simplifies installation.

Preferably, the sleeve located outside the housing is adjacent to the first part of the fixed contact over a certain length outside the support portion, the length can be adjusted so as to modify the withstand voltage of the switchgear. ).

Thus, the subject of the present application is a bushing for a gas-insulated switchgear filled with a dielectric gas under pressure and comprising a conductor element mounted in a support forming the A part of the housing, the support part comprising a through hole in which the conductor element is mounted, the conductor element comprising an elongated body provided with radial projections on the sides having a longitudinal axis, the projections Delimited longitudinally first by a first annular surface inclined relative to said longitudinal axis, and secondly by a second annular surface inclined relative to said longitudinal axis, said two faces inclined in opposite directions, the electrical insulation device is mounted In said bore, and between at least one shoulder of said bore and said conductor element, said means comprises first and second inclined annulus which face-wise bear against said radial projections. an inclined face of the annulus, and a clamping plate is mounted on said support and bears against said electrical insulating means to exert a clamping force on said electrical insulating means bearing against said shoulder of said hole .

The electrical isolation means may include a first sleeve and a second sleeve, the first sleeve is made of an electrical insulation material surrounding the first portion of the fixed contact, mounted on the shoulder of the through hole part and the radial protrusion, and is provided with an inclined surface in surface contact with the first inclined surface of the radial protrusion, the second sleeve is made of electrically insulating material surrounding the second part of the conductor element is installed between the clamping plate and the radial protrusion, and is provided with an inclined surface in surface contact with the second inclined surface of the radial protrusion.

Advantageously, said second sleeve comprises a portion of larger diameter carrying said bevel and a portion of smaller diameter passing through and beyond said clamping plate adjacent to the second portion of said fixed contact.

Advantageously, the first sleeve also comprises a ventilation channel passing through said first sleeve for gas circulation between the two longitudinal faces of the first sleeve.

Advantageously, said inclined surface exhibits an angle of inclination relative to said longitudinal axis in the range of 30° to 60°, more advantageously equal to 45°. One of the faces may have an inclination angle of up to 90°.

Contact between the second sleeve and the conductor element prevents leakage of dielectric gas, and contact between the second sleeve and the through hole prevents leakage of dielectric gas.

To this end, an O-ring is mounted in a groove made in the side surface of the conductor element and is in contact with the hole of the second sleeve and/or an O-ring is mounted in a groove made in the second The groove in the side surface of the sleeve is in contact with the through hole of the support part.

For example, the clamping plate is fastened to the support part by screws fastened directly in the support part. Advantageously, the face of the clamping plate in contact with the second sleeve comprises a recess accommodating the portion of the second sleeve protruding from the hole of the support.

The end of the conductor element designed to be outside the housing of the switchgear comprises a flat and a hole through the flat for mounting a connecting rod.

Another subject of the present application is also an earthing switch assembly comprising at least one bushing according to the application, said conductor element being a fixed contact and the switch comprising at least one movable contact mounted slidingly relative to said fixed contact , the movable contact is designed to bring the fixed contact into electrical contact with a phase contact connected to a current conductor of the switching device.

Another subject of the present application is also an earthing switch assembly for a three-phase switchgear, comprising three assemblies of the application.

The three flats formed on the fixed contact may be substantially coplanar to enable a ground rod to be fastened thereto.

Advantageously, said support part comprises two protrusions on its outer side, each said protrusion being located between two fixed contact ends and provided with means for fastening the ground rod to said hole in the cap.

The upper end of the protrusion is substantially coplanar with the axial edge of the flat and the longitudinal end of the second sleeve protruding from the outside of the cap.

Another subject-matter of the present application is also a hermetically sealed metal-encapsulated medium-high voltage switchgear filled with a pressurized dielectric gas, comprising a metal housing, at least one electrical conductor connected to a phase contact, and a hermetically sealed At least one component of the present application is installed on the housing in a manner.

For example, said casing presents a tubular general shape on which said cap of said assembly is mounted laterally.

Another subject of the present application is also a medium-high voltage three-phase switchgear comprising three electrical conductors each connected to a phase contact and an assembly of the present application.

By way of example, the switchgear comprises an earth rod fastened to the end of the fixed contact by a screw-nut system.

The ground rod may be secured to the cap by screws screwed into holes in the protrusion.

Description of drawings

This application can be better understood from the following description and accompanying drawings, in which:

Figure 1 is a longitudinal sectional view of a part of the earthing switch assembly of the present application;

Figure 2 is a perspective view of the outside of a piece of three-phase switchgear comprising three grounding switch assemblies of Figure 1;

Figure 3 is a schematic perspective view of an example of a switchgear to which the present application can be applied; and

FIG. 4 is a cross-sectional view of an embodiment of the grounding switch of the present application.

Detailed ways

This application relates to single-phase earthing switches as well as three-phase earthing switches.

In the example shown, the fixed ground contacts and the elements forming the ground switch assembly are bodies of revolution. This simplifies the manufacture and installation of the elements.

FIG. 1 shows a section of a switching device 2 of the present application in section on the grounding switch assembly 4 of the present application ( FIG. 4 ).

FIG. 2 shows a part of a three-phase switchgear of the present application, which comprises three components E1 , E2 and E3 of the present application, viewed from the outside.

Fig. 3 schematically shows an example of a three-phase switchgear to which the present application can be applied.

The switchgear 2 comprises a hermetic housing 6 filled with a pressurized dielectric gas, such as sulfur hexafluoride (sF6).

The switchgear 2 comprises one or more current conductors 8 or conductive bars (eg high voltage bars) extending along the axis X housed inside the housing 6 .

The housing 6 comprises a first tubular portion 6.1 having a longitudinal axis X and a second portion 6.2 forming side caps cooperating with said tubular portion 6.1. The tubular portion 6.1 comprises a side opening closed in a hermetic manner by a side cap 6.2.

In the example shown, the side cap 6.2 is roughly bell-shaped.

Naturally, a planar cap still falls within the scope of the present application. Furthermore, switchgear with any other earthing switch arrangement remains within the scope of the present application.

The earthing switch assembly of the present application is installed through the side cap 6.2. In the example shown, the cap 6.2 is provided with an annular flange 12 by means of which the cap 6.2 is fastened to the tubular part 6.1 via a flange 14 delimiting said side opening.

The fixed contact 18 of the earthing switch protrudes from the side cap 6.2.

It can be clearly understood that the grounding switch assembly of the present application can be directly installed in the housing without being installed on the supporting part in advance.

Since the three components El, E2, E3 are similar, only component El will be described in detail below.

The earthing switch assembly E1 is mounted in a bore 16 having a longitudinal axis Y passing through the cap 6.2.

The cap 6.2 forms a support for mounting said stationary contact.

The assembly includes fixed contacts 18 fixed in holes 16 .

The bore 16 includes a first smaller diameter portion 20 oriented towards the inside of the housing 6 and a second larger diameter portion 22 oriented towards the outer side of the housing 6, the first portion 20 and the second portion 22 being defined by an annular surface forming a shoulder. 24 connected.

Said earthing switch comprises a fixed contact 18, a movable contact 19 and a phase contact 10 mounted in electrical contact with the current conductor (both visible in Figure 4).

The movable contact is designed to bring the fixed contact 18 into electrical contact with the phase contact, thereby grounding the phase contact and the conductor connected to the phase contact.

In the present application, the fixed contact 18 comprises a radial protrusion 26 dividing said fixed contact into a first longitudinal part 28 and a second longitudinal part 30, the first part 28 protruding inside the cap 6.2 and the second part 30 in the The cap 6.2 protrudes outside and is designed to be grounded.

The radial protrusion 26 is formed geometrically by two truncated cones 32 , 34 with a longitudinal axis Y, which are oppositely inclined so as to meet at the larger base of the truncated cones 32 , 34 .

The frustocones 32, 34 are marked by dashed lines in FIG. 1 . In this way, the radial projection 26 comprises two annular surfaces 26.1, 26.2 surrounding the axis Y and inclined relative to the axis Y. In practice, the fixed contacts are produced as a single part, for example by machining.

In the example shown, the connection between the two frustocones 32, 34 is trimmed, forming a cylindrical zone 35, so as to avoid sharp corners and reduce the risk of damage.

The assembly E1 also comprises means 36 for electrically insulating the fixed contact 18 from the cap 6.1.

The device 36 comprises a first sleeve 38 of electrically insulating material mounted around the first portion 28 of the stationary contact 18 and a second sleeve 38 of electrically insulating material mounted around said second portion of the stationary contact 18. Sleeve 40.

The first sleeve 28 is referred to as the "inner sleeve" and the second sleeve is referred to as the "outer sleeve".

For example, the insulating sleeve is made of polyethylene terephthalate (PET), epoxy resin or polytetrafluoroethylene (PTFE).

The inner sleeve 38 has an inner diameter substantially equal to the diameter of the first portion 28 of the stationary contact 18 such that the inner sleeve 38 can fit around the first portion 28 with minimal clearance.

The inner sleeve 38 also comprises an inner bevel 42 having a substantially equal inclination angle and substantially equal area to that of the first beveled surface 26.1 such that the bevel 44 bears in a planar manner against the first beveled surface 26.1.

In the example shown, the inner sleeve 38 comprises, on its outer side, a shoulder 41 which is intended to bear against the shoulder 24 of the bore 16 . A shoulder 41 interconnects the larger diameter portion with a smaller diameter portion 43 that fits in the smaller diameter portion 20 of the bore 16 .

Advantageously, a ventilation channel 45 is formed in said inner sleeve, the contour of which partially intersects portion 43 and passes through said larger diameter portion, enabling dielectric gases to reach between the elements, avoiding partial discharges.

It is conceivable to use an inner sleeve formed only by a washer fitted in the larger diameter portion of the bore and bearing against the shoulder 24 of the bore 16 of the cap.

The outer sleeve 40 has an inner diameter substantially equal to the diameter of the second portion 30 of the stationary contact 18 , enabling the outer sleeve 40 to fit around the second portion 30 with minimal play.

The outer sleeve 40 also includes an inner bevel 44 having an inclination angle substantially equal to that of the second beveled surface 26.2 of the radial protrusion 26 and an area substantially equal so that the bevel 44 bears against the second bevel in a planar manner. Side 26.2.

The outer sleeve 40 includes on its outer side a shoulder 48 against which the clamping plate 50 bears.

Clamping plate 50 includes a central aperture 51 through which fixed contact 18 and a smaller diameter portion 56 of outer sleeve 40 pass.

Outer sleeve 40 includes a larger diameter first portion 52 that fits within larger diameter portion 22 of bore 16 and a smaller diameter second portion 56 beyond shoulder 48 that passes through clamping plate 50 and Next to the second part 30 located on the outside.

In the example shown, the second portion 30 has a diameter that is smaller than the diameter of the first portion 28 . With this configuration, the creepage distance on the surface of the insulating sleeve 40 having the smaller diameter second portion 56 is greater than the creepage distance on the insulating sleeve 38 because the sleeve 38 is in the In a clean insulating gas atmosphere inside the housing. Sealing means are provided between the second sleeve 40 and the stationary contact 18 .

For example, two O-rings 58 are mounted in respective grooves 60 made in the side surfaces of the second part 30 of the stationary contact 18 .

Sealing means are also provided between the larger diameter portion 22 of the bore 16 and the outer sleeve 40 .

For example, two O-rings 61 are mounted in annular grooves 63 formed in the radially outward facing surface of the larger diameter portion 52 of the outer sleeve 40, and are aligned with the larger diameter of the bore 16. The inside surfaces of the diameter portion 22 are in contact.

These seals provide a static seal against gas leakage.

Naturally, the sealing can be implemented differently at other locations, for example by lip seals, although such a static seal does not require such a seal.

The inner sleeve 38 is initially installed in the hole 16 with the shoulder 41 bearing against the shoulder 24 of the hole 16, then the fixed contact 18 is inserted into the inner sleeve 38 with the first inclined face 26.1 of the radial protrusion 26 bearing against the inner side Bevel 42 of sleeve 38 .

The outer sleeve 40 is then fitted around the second part 30 of the stationary contact 18 , the inclined face 44 of the outer sleeve 40 bearing against the second inclined face 26 . 2 of the radial protrusion 26 .

The clamping plate 50 is then fitted around the stationary contact 18 and the smaller diameter portion 56 of the outer sleeve 40 .

The clamping plate 50 is fastened to said cap by screws 62 screwed in holes 64 formed directly in said cap around the holes. Clamping occurs by compression between the shoulder 48 of the outer sleeve 40 and the inner side 66 of the clamping plate 50 .

The smaller diameter portion of the second sleeve 40 serves to avoid electrical flashover between the stationary contact 18 and the clamping plate 50 . The length of the second sleeve 40 can be modified in order to modify the pressure resistance of the switch.

In the example shown, the sum of the axial dimensions of the larger diameter portion of the outer sleeve 40 and the larger diameter portion of the inner sleeve 38 is greater than the depth of the larger diameter portion 22 of the bore 16 .

As such, the larger diameter portion 52 of the outer sleeve 40 protrudes beyond the bore 16 .

The clamping plate 50 includes an annular recess 66 accommodating the end of the larger diameter portion of the outer sleeve 40 protruding beyond the bore, making it possible to reduce the length of the device and make it more compact.

An assembly in which the bearing surface of the clamping plate is planar, or in which the shoulder 48 of the outer sleeve is flush with the end of the hole 16 and the bearing surface of the clamping plate 51 is planar would not exceed the scope of this application. .

Figure 2 shows an example of how the fixed contacts of the earthing switch assembly of the present application are connected for a three-phase switchgear.

The free ends of the second parts 30 of the three stationary contacts 18 each comprise a flat portion 68 and a hole 70 extending transversely to the flat portion 68 .

The three flats 68 are substantially coplanar.

The ground rod 72 has a rectangular cross-section, or a ground rod 72 comprising at least one planar side such that one side thereof bears against the flat portion 68 .

The rod 72 is fastened by a screw-nut system 73 mounted in the hole 70 in said free end and in the hole made in the ground rod 72 .

The ground rod 72 is also fastened directly on the cap 6.2 in a particularly advantageous manner. For this purpose, the cap 6 .

The ground rod 72 includes two through holes aligned with the two protrusions 74 so as to accommodate screws 76 for fastening the ground rod to the cap.

Advantageously, the free end of the projection 74 is aligned with the axial face of said flat and with the free end of the smaller diameter portion of the outer sleeve 40 adjacent to the fixed contact 18 on the outside of the housing. Align the ends. This alignment ensures a stable fastening of the ground rod 72 and avoids imparting torsion to the stationary contact 18 with the ground rod 72 depending above.

The fixed contact 18 is made of aluminum, for example.

The clamping plate 50 exerts a force along the axis Y by pressing on the outer sleeve 40, which force is released from the outer sleeve 40 by pressing between the second inclined surface 26.2 of the radial projection 26 and the inclined surface of the outer sleeve 40. The barrel 40 is passed onto the fixed contact 18 .

In this way, the force normal to the surface of the contact is resolved into a radial component and an axial component.

The reaction force at the first inclined surface 26.1 is also distributed along a radial component as well as an axial component.

Thus, the fixed contact 18 is fixed axially as well as transversely by means of the radial projections 26 . The inner sleeve 38 and outer sleeve 40 deform elastically during clamping.

In this way, the fixed contact 18 is held rigidly in the axial and radial directions.

Advantageously, the angle of inclination of the first and second inclined faces of the radial projection 26 is in the range of 30° to 60°, and is advantageously equal to 45°, in order to ensure the balance between said radial and axial components. distributed. The inclination angle of the surface 26.1 in contact with the inner sleeve 38 can reach 90°.

In this way, due to the rigid or nearly rigid mechanical retention of the fixed contact 18, the load applied to the fixed contact 18 when said movable contact moves causes no or little movement of the fixed contact 18, There is no longer any risk of degradation. Furthermore, the guidance of the movable contact is improved since the fixed contact also forms a rigid guide support for the sliding of the movable contact.

The electrical insulation between the housing and the fixed contacts is provided only by the two sleeves 38 and 40 , without the application of an electrical insulating material of the plastic material type to the screws used to fasten the clamping plate 50 .

These materials are prone to elastic creep and aging.

Furthermore, the sleeve and the fixed contact of the present application are held simultaneously only by the clamping plate and the specific shape of the element.

Furthermore, the elements exhibit a relatively simple body of revolution, enabling the shape to be manufactured and assembled simply.

Furthermore, the present application presents the advantage of providing a self-contained assembly formed by one or more fixed contacts and said cap, which simplifies assembly and disassembly. The pre-installation of this separate component makes it possible to improve the alignment of the contacts.

Furthermore, the assembly exhibits a remarkable compactness.

Airtightness is achieved simply by relatively strong O-rings, reducing the risk of leaks.

The form and arrangement of the movable and phase contacts may be of any known type.

Figure 4 shows the inside of the switchgear of the present application.

Said conductor extends along an axis X along which the current flows, said conductor carrying laterally protruding contacts 10 designed to enable said conductor 8 to be grounded, said contacts 10 being referred to as "phase contact".

The contacts 10 are oriented along an axis Y perpendicular to the axis X. As shown in FIG. In the example shown, the contact 10 comprises a housing 12 electrically connected to the conductor 8 and a tulip-shaped contact element 15 for receiving the end of the contact element of the earthing switch 4 .

The tulip shape is not limiting.

As noted above, the grounding switch of the present application may include three substantially similar components each associated with an electrical conductor 8 .

Only one component is described in detail.

The stationary ground contact 18 includes a first longitudinal end located outside the housing 6 and a second longitudinal end located inside the housing 6 .

The second portion 28 of the fixed ground contact 18 includes a housing 80 having an axis Y. As shown in FIG. Thus, the axis of the housing 80 and the axis of the contact element 10 are aligned. The housing 80 is provided with a peripheral partition 82 .

The movable earth contact 19 presents an elongated shape, such as a rod slidingly mounted in the housing 80 along the length of the axis Y. The inner diameter of the housing 80 and the outer diameter of the movable contact 19 are selected such that the movable contact 19 does not come into contact with the housing 80 . For example, the inner diameter of the housing 80 is 1 mm to 4 mm larger than the diameter of the movable contact 19 .

Electrical contact between the movable contact 19 and the fixed contact 18 is obtained through a tulip-shaped contact 84 fastened to the open end of the housing 80 of the fixed contact 18 . In this way, the movable contact 19 is guided by said contact 84 and mainly by a guide sleeve 88 described below.

For example, the cross-section of the movable ground contact 19 is circular, and the housing 80 presents a circular cross-section.

In the example shown, the movable ground contact 19 comprises a longitudinal first end portion 19 . 1 designed to penetrate into the contact element 15 of the phase contact 10 .

The second longitudinal end of the movable ground contact 19 is mechanically connected via an insulating sleeve 88 sliding around the fixed contact 18 to a displacement means 86 for axially moving the movable ground contact 19 along the Y-axis. Advantageously, said displacement means 86 are laterally biased with respect to said ground contacts in order to enable a more compact assembly.

With this application, the radial and axial retention of the housing 80 is improved, thereby ensuring a good guidance of the movable contact 19 towards the phase contact 10 .

The mechanical connection between the movable ground contact 19 and the displacement means 86 is on the side. To this end, the partition 82 of the housing 80 includes at least one longitudinal slot 90 through which the movable earth contact 19 is mechanically connected with the displacement means 86 .

In the example shown, the partition 82 of the housing 80 advantageously comprises two diametrically opposite longitudinal slots 90, and the second longitudinal end of the movable earth contact 19 comprises a through hole perpendicular to the axis Y, And the pin 94 connected to the displacement device 86 is fitted into said through hole.

This connection ensures a balanced mechanical coupling.

In the example shown, the mechanical connection between the pin 94 and the displacement means 86 is obtained by an electrically insulating sleeve 88 surrounding and sliding around the fixed ground contact 18 .

In another variant embodiment, the grounding switch includes a fixed grounding contact of the present application installed in a mounting plate and a movable contact, and the movable contact can move along a direction perpendicular to the fixed grounding contact. The axis of the head moves axially to electrically connect the phase contact and the fixed ground contact. The movable contact is formed by a threaded rod passing through the fixed ground contact.

The contacts 18 may be used for other applications than grounding. For example, it may form an element for conducting a signal (eg temperature) representative of an operating characteristic for a gas insulated switchgear.

Claims (19)

1. the sleeve pipe of a gas-insulated switchgear (2), described switchgear (2) is filled with the dielectric gas of pressurized and comprises the conductor element (18) that is installed in the support portion (6.2), described support portion (6.2) forms the part of the housing (6) of described switchgear, described support portion (6.2) comprises through hole (16), described conductor element (18) is installed in the described through hole (16), described conductor element (18) comprises the elongated main body that is provided with radial projection (26) on the have longitudinal axis side of (Y), described projection is at first limited by the first anchor ring (26.1) that tilts with respect to described longitudinal axis (Y) in the vertical, and secondly limited by the second anchor ring (26.2) that tilts with respect to described longitudinal axis (Y), described two faces tilt in opposite direction, electric insulation arrangement (38,40) be installed in the described hole (16), and at least between a shoulder (24) and described conductor element (18) of described hole (16), described device comprises with the first inclination anchor ring (26.1) of the described radial projection of mode breasting (26) of face and the inclined plane (42 of the second inclination anchor ring (26.2), 44), and grip block (50) is installed on the described support portion (6.2), and the described electric insulation arrangement (38 of breasting, 40), so that at the described electric insulation arrangement (38 of the described shoulder (24) in the described hole of breasting (16), 40) apply chucking power on.

2. the sleeve pipe of switchgear according to claim 1, wherein said electric insulation arrangement comprises the first sleeve (38) and the second sleeve (40), described the first sleeve (38) is made by the electrical insulating material of the first (28) that centers on described fixed contact (18), be installed between the described shoulder (24) and described radial projection (26) in described hole (16), and be provided with the inclined-plane (42) that contacts with the first inclined plane (26.1) face of described radial projection (26), described the second sleeve (40) is made by the electrical insulating material of the second portion (30) that centers on described fixed contact (18), be installed between described grip block (50) and the described radial projection (26), and be provided with the inclined-plane (44) that contacts with the second inclined plane (26.2) face of described radial projection (26).

3. the sleeve pipe of switchgear according to claim 2, wherein said the second sleeve (40) comprise the larger-diameter part (52) of carrying described inclined-plane (44) and pass and exceed the small diameter portion (56) adjacent with second portions described fixed contact (18) (30) described grip block (50).

4. the sleeve pipe of the described switchgear of any one in 3 according to claim 1, wherein said inclined plane (26.1,26.2) present with respect to described longitudinal axis (Y) in 30 ° to 60 ° scope, and advantageously equal 45 ° inclination angle.

5. the sleeve pipe of the described switchgear of any one in 4 according to claim 1, contact preventing dielectric gas between wherein said the second sleeve (40) and the described conductor element (18) leaks, and the contact preventing dielectric gas between described the second sleeve (40) and described hole (16) leaks.

6. the sleeve pipe of switchgear according to claim 5, wherein O shape circle (58) is installed in the groove (60) in the side surface that is made in described conductor element (18), and contacts with the hole of described the second sleeve (40).

7. according to claim 5 or the sleeve pipe of 6 described switchgears, wherein O shape circle (61) is installed in the groove (63) in the side surface that is made in described the second sleeve (40), and contacts with the described hole (16) of described support portion (6.2).

According to claim 1 in 7 any one in conjunction with the sleeve pipe of claim 2 or 3 described switchgears, the face that contacts with described the second sleeve (40) of wherein said grip block (50) comprises recess (66), and described recess (66) holds the part of the hole from described support portion (6.2) (16) projection of described the second sleeve (40).

9. the sleeve pipe of the described switchgear of any one in 8 according to claim 1, the end of described fixed contact (18) that wherein is designed to be in housing (6) outside of described switchgear comprises par (68) and crosses the hole (70) of described par (68), for stub (72) is installed in described end.

10. earthed switch assembly, comprise that at least one is according to the described sleeve pipe of any one in the aforementioned claim, described conductor element is fixed contact (18), and switch comprises at least one with respect to the removable contact that described fixed contact is slidingly installed, and described removable contact is designed to make described fixed contact (18) and phase contact on the Ampereconductors that is connected to described switchgear to electrically contact.

11. an earthed switch assembly that is used for threephase switch equipment comprises three assemblies according to claim 10.

12. according to the described earthed switch assembly for threephase switch equipment of last claim, wherein three described pars (68) are substantially coplanar, and described rod is earth rod.

13. according to the described earthed switch assembly for threephase switch equipment of last claim, wherein said support portion (6.2) is included in two protuberances (74) on its lateral surface, each described protuberance (74) is positioned between two fixed contact ends (18), and is provided with for the hole that earth rod (72) is fastened in the described cap section (6.2).

14. according to the described earthed switch assembly for threephase switch equipment of last claim, the axial edge of the upper end of wherein said protuberance (74) and described par (68) and substantially coplanar from the longitudinal end of described second sleeve (40) of the outside projection of described cap section (6.2).

15. in the airtight metallic packaging that is filled with the pressurized dielectric gas-high-voltage switch equipment, comprise metal shell (6), at least one is connected to the electric conductor (8) on the phase contact and is installed at least one assembly according to claim 10 on the described housing with air-tight manner.

16. in described according to last claim-high-voltage switch equipment, wherein said housing (6) presents the overall shape of tubulose, the described cap section side direction of described assembly is installed on the described housing.

17. in one kind-high voltage threephase switch equipment, comprise three electric conductors being connected to separately the phase contact and the described assembly of any one in 14 according to claim 11.

18. according to claim 17 in conjunction with claim 13 or 14 described in-high voltage threephase switch equipment, comprise by screw-nut system being fastened to earth rod (72) on the end of described fixed contact (18).

19. in described in conjunction with claim 13 according to last claim-and high voltage threephase switch equipment, wherein said earth rod (72) is fastened in the described cap section (6.2) by the screw (76) of twisting in the hole that is affixed to described protuberance (74).

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