CN114078652B - Contact support structure, method of manufacturing the same, and gas-insulated apparatus - Google Patents

Abstract

The invention relates to a contact support structure, a method of manufacturing the same, and a gas-insulated apparatus. The contact support structure includes: a conductive tube (2); a contact block (3) inserted from an open end (21) of the conductive tube (2) and mounted into the conductive tube (2); at least one electrical contact (1) which is arranged on the contact base (3) in a sleeved mode and provides electrical connection between the conductive tube (2) and the contact base (3); a support (4) mounted to the insertion end (31) of the contact base (3) and supporting the conductive tube (2); and an isolation supporting ring (5) sleeved on the contact seat (3) and supporting the conductive tube (2) between the electric contact piece (1) and the opening end (21) of the conductive tube (2). The contact support structure according to the invention enables a larger angular deflection to provide a larger radial deflection compensation, and thus a smaller axial length, reducing the economic costs.

Description

Contact support structure, method of manufacturing the same, and gas-insulated apparatus

Technical Field

The invention relates to the technical field of high-voltage power transmission. More particularly, the present invention relates to a contact support structure. The invention also relates to a gas-insulated device comprising such a contact support structure, and to a method of manufacturing such a contact support structure.

Background

Gas-insulated devices are common devices in the field of high-voltage transmission technology, such as Gas-insulated transmission lines (GIL, gas-Insulated Transmission Lines) and Gas-insulated switchgear (GIS, gas-Insulated Switchgear). In these gas-insulated apparatuses, a conductor is provided in the center of a closed pipe casing filled with an insulating gas, and the conductor and the pipe casing are supported by an insulator. Furthermore, these gas-insulated devices generally comprise a plurality of tube sections which are connected in a sealed manner, the conductors of two adjacent tube sections being electrically connected to one another by means of a contact support structure as a transition conductor.

For example, due to environmental factors or through-flow factors, the pipe shells of these gas-insulated devices may undergo thermal expansion and contraction, and a certain radial offset may occur between the connection positions of two adjacent pipe segments, so that a radial compensation module needs to be disposed between the two adjacent pipe segments to implement radial offset compensation of the power transmission line.

Such radial compensation modules comprise a connection cylinder, typically in the form of a bellows, and a contact support structure fixed inside the connection cylinder. Fig. 1 is a schematic partial cross-sectional view of a prior art contact support structure, which mainly comprises an electrical contact 1, an electrical tube 2, a contact block 3 and a support 4. The conductive tube 2 has the form of a generally hollow metal tube with open ends 21 formed at both ends for connection to the contact header 3. The contact base 3 is inserted from the open end 21 and mounted into the conductive tube 2. At least one electrical contact 1 is fitted over the contact block 3 and is in contact with the conductive tube 2 to provide an electrical connection between the conductive tube 2 and the contact block 3. The support 4 is mounted to the insertion end 31 of the contact block 3, which is generally of annular configuration and is able to support the conductive tube 2, avoiding excessive compression of the electrical contact 1. The shield 6 is mounted on the contact base 3, for example by means of a screw connection or the like, and covers the connection position of the contact base 3 with the conductive tube 2 for reducing electric field interference. The contact support structure is able to provide a certain radial offset compensation, since the conductive tube 2 can be tilted appropriately.

However, if there is a large radial offset between two adjacent pipe sections, a radial compensation module of relatively large axial length is required to achieve radial offset compensation, which adds significant economic cost. And because the bellows needs to bear internal gas pressure, the radial compensation module with relatively large axial length can reduce the stability of the overall structure, and the instability of the power transmission line at the position of the bellows is caused.

Disclosure of Invention

The object of the present invention is to overcome the drawbacks of the prior art described above and to provide a new contact support structure which enables a larger angular deflection to provide a larger radial deflection compensation, and therefore a smaller axial length, and reduced economic costs.

To this end, a first aspect of the invention provides a contact support structure comprising: a conductive tube; a contact block inserted from an open end of the conductive tube and mounted into the conductive tube; at least one electrical contact sleeved on the contact block and providing an electrical connection between the conductive tube and the contact block; a support member mounted to an insertion end of the contact base and supporting the conductive tube; and an isolation support ring sleeved on the contact seat and supporting the conductive tube between the electric contact and the opening end of the conductive tube.

The contact support structure can provide greater radial offset compensation because the spacer support ring can provide a support point when the conductive tube is tilted. That is, the contact support structure having a relatively small axial length can compensate for a large radial offset between adjacent conductors of the gas insulated apparatus, which can effectively reduce economic costs and ensure the overall stability of the power transmission line.

In addition, the isolating support ring has a particle isolating effect, namely, the isolating support ring can isolate metal particles generated by the relative axial movement of the conductive tube and the electric contact piece, so that the gas insulation device can have more reliable insulation performance when in operation.

According to a preferred embodiment of the invention, the outer diameter of the spacer support ring is equal to the nominal inner diameter of the conductive tube.

According to a preferred embodiment of the invention, the outer wall of the contact seat is provided with a groove extending circumferentially for arranging the isolating support ring, and a radial gap exists between the isolating support ring and the bottom of the groove.

According to a preferred embodiment of the present invention, the isolating support ring is provided with a notch, so as to be suitable for being sleeved on the contact seat.

According to a preferred embodiment of the invention, the electrical contact is a coil spring or a watchband contact finger.

According to a preferred embodiment of the invention, the support is a guide support ring comprising a first axial section which is arranged over the insertion end of the contact block and supports the conductive tube, and a second axial section which is provided with a guide bevel for guiding the insertion of the contact block into the conductive tube.

According to a preferred embodiment of the invention, the contact support structure is provided for a gas-insulated apparatus.

A second aspect of the invention provides a gas-insulated apparatus comprising a contact support structure according to the first aspect of the invention.

According to a preferred embodiment of the invention, the gas-insulated apparatus is a gas-insulated power transmission line or a gas-insulated switchgear.

A third aspect of the invention provides a method of manufacturing a contact support structure according to the first aspect of the invention, the method comprising: providing a contact base; providing an isolation support ring, and sleeving the isolation support ring on the contact seat; providing at least one electrical contact and sleeving the electrical contact on the contact base; providing a support and mounting the support to an insertion end of the contact block; and providing a conductive tube and inserting and mounting the contact block into the conductive tube from an open end of the conductive tube such that the electrical contact provides an electrical connection between the conductive tube and the contact block, the support supporting the conductive tube, and the isolation support ring supporting the conductive tube between the electrical contact and the open end of the conductive tube.

In the contact supporting structure according to the invention, the isolating supporting ring has simple structure, convenient manufacture and lower cost, and can be widely applied to the contact supporting structures of various gas-insulated devices.

Drawings

Other features and advantages of the present invention will be better understood from the following detailed description of the preferred embodiments taken in conjunction with the accompanying drawings, in which like reference characters designate the same or similar parts throughout the figures thereof.

FIG. 1 is a schematic partial cross-sectional view of a prior art contact support structure;

FIG. 2 is a schematic cross-sectional view of the conductive tube of the contact support structure of FIG. 1 at a maximum tiltable angle;

FIG. 3 is an enlarged schematic view of region A in FIG. 2;

FIG. 4 is an enlarged schematic view of region B in FIG. 2;

Fig. 5 is an enlarged schematic view of region C in fig. 2;

FIG. 6 is a schematic partial cross-sectional view of one embodiment of a contact support structure according to the present invention;

FIG. 7 is a schematic cross-sectional view of the conductive tube of the contact support structure of FIG. 6 at a maximum tiltable angle;

FIG. 8 is an enlarged schematic view of region D in FIG. 7;

FIG. 9 is an enlarged schematic view of region E in FIG. 7;

FIG. 10 is an enlarged schematic view of region F in FIG. 7;

FIG. 11 is a perspective view of the spacer support ring of the contact support structure of FIG. 6;

FIG. 12 is a schematic plan view of the spacer support ring of FIG. 11;

FIG. 13 is a schematic side cross-sectional view of the spacer support ring of FIG. 11;

fig. 14 is a schematic perspective view of a support of the contact support structure of fig. 6.

Detailed Description

The making and using of the embodiments are discussed in detail below. It should be understood, however, that the detailed description and the specific examples, while indicating specific ways of making and using the invention, are given by way of illustration only and are not intended to limit the scope of the invention.

It is noted that the drawings are not only for the explanation and illustration of the present invention, but also for the limitation of the present invention as necessary. Further, in the present specification, both "axial" and "radial" correspond to the axial and radial directions of the contact support structure and its conductive tube.

The contact support structure according to the invention is in fact an improvement on the basis of the contact support structure shown in fig. 1. The contact support structure may form part of a radial compensation module for a gas insulated device, such as GIL/GIS. More specifically, the radial compensation module comprises an external connection cylinder, at least a portion of which may be in the form of a bellows, or may be arranged with additional compensation elements to enable radial offset compensation, and the contact support structure fixed inside the connection cylinder by means of an insulator.

As mentioned before, the gas-insulated apparatus generally comprises a plurality of sealingly connected pipe segments, each pipe segment comprising a pipe housing and a conductor arranged in the pipe housing by means of an insulator. The radial compensation modules formed by the contact support structures are arranged between part of adjacent pipe sections for compensating radial offset between the pipe sections. The pipe housings of the pipe sections are sealingly connected by the connecting cylinder of the radial compensation module, and the conductors of the pipe sections are electrically connected by the contact support structure of the radial compensation module.

It will of course be appreciated that the contact support structure according to the invention can be used not only for constructing the radial compensation module described above. In fact, for some specific reasons (for example the inclination of the road surface on which the gas-insulated device is arranged), in certain tube sections of the gas-insulated device, a certain relative inclination between the conductive tube and the contact block may be required. The contact support structure according to the invention can thus also be arranged in the pipe housing of these pipe sections to accommodate such a relative inclination.

Fig. 6 is a partial schematic view of an embodiment of a contact support structure according to the invention, which mainly comprises an electrical contact 1, an electrical tube 2, a contact socket 3, a support 4 and an isolating support ring 5. Note that the electrical contact 1, the contact holder 3, the support 4, the spacer support ring 5 and the shield 6 are each symmetrically arranged at both ends of the conductive tube 2 at an axial center position of the conductive tube 2. Thus, the description in this specification applies to these components located at either end of the conductive tube 2.

In the embodiment shown, the construction of the electrical contact 1, the electrical tube 2, the contact holder 3, the support 4 and the shielding can 6 is similar to that of fig. 1, so that reference is made to the description of the contact support structure of fig. 1 in the above paragraph, and the same parts are not repeated here.

It is noted that the form of the electrical contact 1 is not limiting and can be, for example, a coil spring or a watchband contact finger. Furthermore, the number of electrical contacts 1 is not limited, and can be one or more (two electrical contacts 1 are shown in the drawing by way of example), for example, when the current capacity of the contact support structure needs to be increased, the number of electrical contacts 1 can be increased accordingly.

The support 4 is preferably a guide support ring and is made of an insulating material such as plastic. More specifically, as can be seen with particular reference to fig. 14, the guiding support ring comprises a first axial section 41 and a second axial section 42, the first axial section 41 being fitted over the outer wall of the insertion end 31 of the contact block 3 and supporting the conductive tube 2, the second axial section 42 being provided with a guiding bevel for guiding the insertion of the contact block 3 into the conductive tube 2.

The spacer support ring 5 is fitted over the contact block 3, is made of an insulating material such as plastic, and supports the conductive tube 2 between the electrical contact 1 and the open end 21 of the conductive tube 2. Thus, the spacer support ring 5 forms together with the support 4 a support for the conductive tube 2.

In fact, during operation of the gas-insulated apparatus, a relative axial movement may occur between the conductive tube 2 and the electrical contact 1, and particles generated by this relative axial movement may enter the shielding case 6 and even reach the inner surface of the pipe casing of the gas-insulated apparatus, so that it is often necessary to provide additional particle capturing means on the inner surface of the pipe casing of the gas-insulated apparatus. In the present invention, however, since the isolation support ring 5 is disposed between the electric contact 1 and the open end 21 of the electric conduction pipe 2, it has a good particle isolation effect, and it is possible to prevent particles generated due to the relative axial movement of the electric conduction pipe 2 and the electric contact 1 from reaching the inner surface of the shield 6 or the pipe housing, and thus it is possible to ensure more reliable insulation performance when the gas insulation apparatus is operated.

Preferably, the outer diameter of the spacer support ring 5 is substantially equal to the nominal inner diameter of the conductive tube 2. The spacer support ring 5, which is usually made of plastic material, has a certain stiffness, so that a good matching of the spacer support ring 5 to the inner wall of the conductive tube 2 can further optimize its particle isolation.

Furthermore, the contact support structure can provide a larger radial offset compensation, since the spacer support ring 5 can provide a support point when the conductive tube 2 is tilted. The greater radial offset compensation effect obtained by the contact support structure according to the invention is described below with the aid of fig. 2 to 5 and 7 to 10.

Fig. 2 is a schematic cross-sectional view of the maximum tiltable angle of the conductive tube 2 of the prior art contact support structure of fig. 1. As shown in fig. 2, when there is a radial offset between the two conductors to which the contact support structure is connected, the conductive tube 2 is tilted with respect to its original axial direction (the axial direction when there is no radial offset between the two connected conductors, i.e., the horizontal direction as shown), for example, the clockwise tilt as shown. In this case, the conductive pipe 2 and the two supports 4 form a first support point S01 and a second support point S02 (refer to fig. 3 and 4), respectively, and an axial distance between the first support point S01 and the second support point S02 is L0. Due to such tilting of the conductive tube 2, the top portion of the electrical contact 1 near the second support point S02 may be excessively compressed by the conductive tube 2 (refer to fig. 4), while the bottom portion may be separated from the conductive tube 2, resulting in poor electrical contact (refer to fig. 5). Thus, to ensure good electrical contact, the conductive tube 2 has a maximum tiltable angle. The maximum inclinable angle of the conductive tube 2 shown in fig. 2 is α, and therefore, the maximum radial offset Δy=l0×sin α that the contact support structure can compensate. If a larger radial offset is to be compensated for, the axial length of the conductive tube 2 needs to be increased, which increases the economic costs considerably.

Fig. 7 is a schematic cross-sectional view of the maximum tiltable angle of the conductive tube of the contact support structure of fig. 6 according to the present invention. As shown in fig. 7, in the case where the conductive tube 2 is also inclined clockwise, the conductive tube 2 forms a first supporting point S11 (refer to fig. 8) with the supporting member 4 (on the left side of fig. 7), and forms a second supporting point S12 (refer to fig. 9) with the spacer supporting ring 5 (on the right side of fig. 7), the axial distance between the first supporting point S11 and the second supporting point S12 is L1, L1 is slightly greater than L0 in fig. 2 (in fact, the difference between L1 and L0 is negligible compared with the length of the conductive tube 2), and thus the maximum radial offset that the contact supporting structure can compensate is mainly determined by the maximum inclinable angle of the conductive tube 2). Since the second support point is shifted between the electric contact 1 (on the right side of fig. 7) and the right-side open end 21 of the conductive tube 2 as compared with fig. 2, the electric contact 1 near the second support point S12 is not excessively compressed or separated from the conductive tube 2 (refer to fig. 9 and 10), and thus the conductive tube 2 can be tilted by a larger angle until the conductive tube 2 is positionally interfered with the bottom of the support 4 (refer to the position interference point S2 in fig. 10). The maximum inclinable angle of the conductive tube 2 shown in fig. 7 is β, and the maximum radial offset Δy=l1×sin β that the contact support structure can compensate is greater than α in fig. 2, so that the axial length of the conductive tube 2 required for the contact support structure according to the present invention is smaller if the same radial offset needs to be compensated, thereby effectively saving economic cost. Furthermore, the contact support structure enables a gas-insulated device with a more reliable current carrying capacity in operation, since the position of the second support point S12 enables to ensure a good electrical contact between the conductive tube 2 and the electrical contact 1 when the conductive tube 2 is tilted.

Preferably, the outer wall of the contact holder 3 is provided with an annular groove 32 extending circumferentially for arranging the spacer support ring 5, and a small radial gap (for example a radial gap of 1 mm) exists between the spacer support ring 5 and the bottom of the groove 32, i.e. the inner diameter of the spacer support ring 5 is slightly larger than the outer diameter of the contact holder 3 at the location of the annular groove 32. The presence of the grooves 32 facilitates the positioning of the spacer support ring 5 and the presence of the radial gap enables a certain freedom of radial movement of the spacer support ring 5 when compressing the spacer support ring 5, for example due to tilting of the conductive tube 2. When the conductive tube 2 is inclined, the conductive tube 2 drives the isolation support ring 5 to move radially until a part of the isolation support ring 5 contacts with the bottom of the groove 32, so that the isolation support ring 5 plays a supporting role on the conductive tube 2.

Furthermore, it is also preferable that the spacer support ring 5 is provided with a notch 51 (refer to fig. 11 to 13) adapted to deform the spacer support ring 5 radially outwards to a certain extent when the spacer support ring 5 is mounted, so as to be able to be conveniently sleeved on the outer wall of the contact holder 3. The spacer support ring 5 can be restored to its original shape regardless of the radially outward deformation of the spacer support ring 5 which occurs upon installation or the radially inward deformation which may occur upon tilting of the conductive tube 2. Therefore, since the spacer support ring 5 has a certain rigidity, the particle isolating effect by the matching of the spacer support ring 5 with the inner wall of the conductive tube 2 is not affected by the deformation.

The method of manufacturing the contact support structure described above is described below.

The method comprises providing an electrical contact 1, a conductive tube 2, a contact block 3, a support 4 and an isolating support ring 5, and assembling these five components in sequence. In the assembly process, first, the isolation support ring 5 and the electrical contact 1 are sequentially sleeved on the contact base 3 by the insertion end 31 of the contact base 3, for example, sleeved on the outer wall of the contact base 3 and respectively dedicated to the arrangement of the isolation support ring 5 and the electrical contact 1 in the groove 32 and the electrical contact groove. The support 4 is then mounted to the insertion end 31 of the contact block 3, for example with the first axial section 41 of the support 4 snap-fitted with the insertion end 31 of the contact block 3. Finally, the contact block 3 (more specifically, the assembly of the contact block 3 with the insulating support ring 5, the electrical contact 1 and said support 4) is fitted with the conductive tube 2, i.e. the contact block 3 is inserted from the open end 21 of the conductive tube 2 and fitted into the conductive tube 2 so that the conductive tube 2 forms an electrical connection with the contact block 3, the support 4 supports the conductive tube 2, and the insulating support ring 5 supports the conductive tube 2 between the electrical contact 1 and the open end 21 of the conductive tube 2.

While the foregoing has described the technical content and features of the present invention, it will be appreciated that those skilled in the art, upon attaining the teachings of the present invention, may make variations and improvements to the concepts disclosed herein, which fall within the scope of the present invention.

The above description of embodiments is illustrative and not restrictive, and the scope of the invention is defined by the claims.

Claims (9)

1. A contact support structure, the contact support structure comprising:

A conductive tube (2);

a contact block (3), the contact block (3) being inserted into the conductive tube (2) from an open end (21) of the conductive tube (2);

at least one electrical contact (1), the electrical contact (1) being arranged around the contact socket (3) and providing an electrical connection between the conductive tube (2) and the contact socket (3);

-a support (4), the support (4) being mounted to an insertion end (31) of the contact block (3) and supporting the conductive tube (2); and

An isolation support ring (5), wherein the isolation support ring (5) is sleeved on the contact seat (3) and supports the conductive tube (2) between the electric contact piece (1) and the opening end (21) of the conductive tube (2),

Wherein a groove (32) which extends along the circumferential direction and is used for arranging the isolation supporting ring (5) is arranged on the outer wall of the contact seat (3), a radial gap exists between the isolation supporting ring (5) and the bottom of the groove (32),

Wherein the contact support structure is configured such that when the conductive tube (2) is tilted, the conductive tube (2) forms a first support point (S11) with the support (4) and a second support point (S12) with the spacer support ring (5) to ensure electrical contact between the conductive tube (2) and the electrical contact (1).

2. Contact support structure according to claim 1, characterized in that the outer diameter of the spacer support ring (5) is equal to the nominal inner diameter of the conductive tube (2).

3. Contact support structure according to claim 1, characterized in that the spacer support ring (5) is provided with notches (51) suitable for being fitted over the contact seat (3).

4. A contact support structure according to any one of claims 1 to 3, characterized in that the electrical contact (1) is a helical spring or a watchband contact finger.

5. A contact support structure according to any one of claims 1 to 3, characterized in that the support (4) is a guide support ring comprising a first axial section (41) and a second axial section (42), the first axial section (41) being sleeved on the outer wall of the insertion end (31) of the contact holder (3) and supporting the conductive tube (2), the second axial section (42) being provided with a guide bevel for guiding the insertion of the contact holder (3) into the conductive tube (2).

6. A contact support structure according to any one of claims 1 to 3, characterized in that the contact support structure is provided for a gas-insulated apparatus.

7. A gas-insulated device, characterized in that it comprises a contact support structure according to any one of claims 1 to 6.

8. The gas-insulated apparatus according to claim 7, characterized in that the gas-insulated apparatus is a gas-insulated power transmission line or a gas-insulated switchgear.

9. A method of manufacturing a contact support structure, the method comprising:

Providing a contact base (3);

Providing an isolation support ring (5), and sleeving the isolation support ring (5) on the contact seat (3), wherein a groove (32) which extends circumferentially for arranging the isolation support ring (5) is formed in the outer wall of the contact seat (3), and a radial gap exists between the isolation support ring (5) and the bottom of the groove (32);

Providing at least one electrical contact (1) and sleeving the electrical contact (1) on the contact base (3);

-providing a support (4) and mounting the support (4) to an insertion end (31) of the contact holder (3); and

Providing a conductive tube (2) and inserting and mounting the contact block (3) into the conductive tube (2) from an open end (21) of the conductive tube (2) such that the electrical contact (1) provides an electrical connection between the conductive tube (2) and the contact block (3), the support (4) supporting the conductive tube (2) and the spacer support ring (5) supporting the conductive tube (2) between the electrical contact (1) and the open end (21) of the conductive tube (2),

Wherein the contact support structure is configured such that when the conductive tube (2) is tilted, the conductive tube (2) forms a first support point (S11) with the support (4) and a second support point (S12) with the spacer support ring (5) to ensure electrical contact between the conductive tube (2) and the electrical contact (1).