CN217087485U

CN217087485U - Reducing intermediate joint for high-voltage cable

Info

Publication number: CN217087485U
Application number: CN202220521278.3U
Authority: CN
Inventors: 秦浩; 柯德刚; 王体才
Original assignee: Yongjin Capacitor Co ltd; Shanghai Yongjin Electric Technology Co ltd
Current assignee: Yongjin Capacitor Co ltd; Shanghai Yongjin Electric Technology Co ltd
Priority date: 2022-03-11
Filing date: 2022-03-11
Publication date: 2022-07-29
Anticipated expiration: 2032-03-11

Abstract

The utility model discloses a reducing intermediate head for high tension cable. It includes conductor connecting pipe and high-voltage shield cover subassembly, the one end and the first cable conductor of conductor connecting pipe are connected, the other end and the second cable conductor of conductor connecting pipe are connected, the high-voltage shield cover subassembly install in the outside of conductor connecting pipe, the one end external diameter of high-voltage shield cover subassembly is unanimous with first cable insulation shell's external diameter, the other end external diameter of high-voltage shield cover subassembly is unanimous with second cable insulation shell's external diameter. The utility model has the advantages that: the advantages of the two prior technical schemes in the background art are combined, the defects are avoided, the intermediate joint can be stably used for connecting cables with different insulation outer diameters, the service life of the whole intermediate joint is effectively prolonged, the reducing intermediate joint can be stably used, and the cost is low.

Description

Reducing intermediate joint for high-voltage cable

Technical Field

The utility model belongs to the technical field of the relevant technique of power cable annex and specifically relates to indicate a reducing intermediate head for high tension cable.

Background

For the intermediate joints of high voltage cables, it is common that high voltage cables of the same conductor nominal cross-section are butted against each other. However, in some special cases, such as when new and old cables are butted, it may happen that high-voltage cables with different conductor nominal sections need to be butted with each other.

When the outer insulating diameters of two opposite cables have a fall, the use condition of the conventional integral prefabricated intermediate joint is limited to a certain extent, and meanwhile, special requirements are also required on the installation process of the conventional integral prefabricated intermediate joint. The interference fit can ensure that the main body of the intermediate joint does not generate internal creepage (which means internal flashover between the inner hole of the intermediate joint and the outer surface of the cable insulation matched with the inner hole) after being installed; meanwhile, the interference magnitude between the aperture of the integral prefabricated intermediate joint and the outer diameter of a larger cable cannot be too large, so that the installation is difficult.

To meet the above requirements, the existing technical solutions are more common in 2 kinds:

1) after the conductor connecting pipe is well pressed with the cable conductor, a semi-conductive self-adhesive tape is wound outside the conductor connecting pipe and the cable conductor until the step between the cable insulations on the two sides of the conductor connecting pipe is filled. The advantages of this solution are: the semi-conductive self-adhesive tape can enable a tapered surface transition to be formed between the outer diameter of the thinner cable insulation and the outer diameter of the thicker cable insulation. The disadvantages of this solution are: the base material of the semi-conductive self-adhesive tape is rubber which is not fully vulcanized, the adhesiveness is poor, and the bonding points between layers, particularly the tail ends of the semi-conductive self-adhesive tape and the next layer of self-adhesive tape are easy to separate, which is a great hidden trouble for the installation quality of products.

2) The outer diameter of the shielding cover component is only matched with the insulating outer diameter of a small cable, and a certain fall is formed between the outer diameter of the shielding cover component and the insulating outer diameter of a large cable. The insulation of the larger cable needs to be properly thinned during installation to accommodate the smaller outer diameter of the metal high voltage shield assembly. The disadvantages of this solution are: when the insulation of a larger cable is thinned, the electrical insulation tolerance of the section of cable is reduced, and therefore the service life of the whole intermediate joint can be influenced.

SUMMERY OF THE UTILITY MODEL

The utility model relates to a overcome and to have foretell not enough among the prior art, provide a can surely use reducer union's reducing intermediate head for high tension cable.

In order to achieve the above purpose, the utility model adopts the following technical scheme:

a reducing intermediate joint for high-voltage cables is arranged between a first high-voltage cable and a second high-voltage cable, the first high-voltage cable comprises a first cable conductor and a first cable insulation shell covering the outer side of the first cable conductor, the second high-voltage cable comprises a second cable conductor and a second cable insulation shell covering the outer side of the second cable conductor, the outer diameter of the first cable conductor is different from that of the second cable conductor, the outer diameter of the first cable insulation shell is different from that of the second cable insulation shell, the reducing intermediate joint comprises a conductor connecting pipe and a high-voltage shielding cover assembly, one end of the conductor connecting pipe is connected with the first cable conductor, the other end of the conductor connecting pipe is connected with the second cable conductor, the high-voltage shielding cover assembly is arranged on the outer side of the conductor connecting pipe, and the outer diameter of one end of the high-voltage shielding cover assembly is consistent with that of the first cable insulation shell, and the outer diameter of the other end of the high-voltage shielding cover assembly is consistent with that of the second cable insulating shell.

The structure of the intermediate joint can be an integral prefabricated intermediate joint, can be a lapped intermediate joint, and can also be other intermediate joints used for high-voltage shielding case components. The nominal cross section of the conductors of two high-voltage cables which are butted is different, the outer diameters of the cable conductors are correspondingly different, and the outer diameters of the cable insulation shells are also different. The outer diameters of two ends of the high-voltage shielding cover assembly matched with the conductor connecting pipe are respectively equal to or slightly smaller than the outer diameters of the adjacent cable insulations on two sides. The design combines the advantages of the two prior technical schemes in the background technology and avoids the defects, so that the intermediate joint can be stably used for connecting cables with different insulation outer diameters, the service life of the whole intermediate joint is effectively prolonged, the reducing intermediate joint can be stably used, and the cost is low.

Preferably, the conductor connecting pipe is integrally formed, the conductor connecting pipe comprises a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are in transition connection through a conical surface, a first inner hole is formed in the first connecting pipe, the first cable conductor is inserted into the first inner hole of the first connecting pipe, a second inner hole is formed in the second connecting pipe, the second cable conductor is inserted into the second inner hole of the second connecting pipe, and the first inner hole is communicated with the second inner hole. The inner hole of the conductor connecting pipe is in a reducing combination design and comprises two inner holes with different diameters, and the two inner holes correspond to different cable conductor outer diameters respectively, so that differences exist; the design of different inner hole diameter sizes of the conductor connecting pipe must ensure that the corresponding cable conductors with different outer diameters can be smoothly inserted, and the inner hole cannot be overlarge, so that the conductor connecting pipe can be tightly and reliably connected with the cable conductors with different outer diameters in a crimping mode when the conductor connecting pipe is crimped by a matched crimping pliers to generate creep deformation.

Preferably, the conductor connecting pipe is made of a metal material which does not crack when deformed due to creep. The conductor connecting pipe is made of metal materials of special materials, and when the conductor connecting pipe is subjected to creep deformation caused by compression joint of matched pressing pliers, the conductor connecting pipe cannot crack.

Preferably, the material of the first connecting pipe on the conductor connecting pipe is consistent with that of the first cable conductor, and the material of the second connecting pipe on the conductor connecting pipe is consistent with that of the second cable conductor. The material of the conductor connecting pipe is the same as that of the cable conductor, for example, when the two cable conductors are both copper materials, the material of the conductor connecting pipe is copper materials; when the two cable conductors are made of aluminum, the conductor connecting pipe is made of aluminum; when the two cable conductors are made of copper material and aluminum material, the conductor connecting pipe is a copper-aluminum connecting pipe.

Preferably, the high-voltage shielding case assembly comprises a first half piece and a second half piece, the shape of the first half piece is the same as that of the second half piece, a plurality of metal pin holes are formed in the edge of the first half piece, metal pins matched with the metal pin holes are arranged at the edge of the second half piece, the first half piece is installed on the second half piece through the matching of the metal pin holes and the metal pins, grooves are formed in the inner side of the first half piece and the inner side of the second half piece, and the conductor connecting pipe is arranged in the groove of the first half piece and the groove of the second half piece. The metal pins are matched with each other to form an integral high-voltage shielding cover assembly structure, the metal pins are positioned outside the conductor connecting pipe, and the inner diameters of two ends of the high-voltage shielding cover assembly are slightly larger than the outer diameter of a cable conductor matched with the high-voltage shielding cover assembly.

Preferably, the high-voltage shielding cover assembly is made of a conductive material, at least one flexible metal wire is arranged in the high-voltage shielding cover assembly, and the high-voltage shielding cover assembly is electrically connected with the conductor connecting pipe through the flexible metal wire. The high-voltage shielding cover assembly is made of conductive materials, and can be made of aluminum alloy or copper alloy; the flexible metal wire can be a tinned braided copper wire with a small cross section, and when the middle joint is installed, the flexible metal wire needs to be reliably fixed with the conductor connecting pipe to form stable electrical connection.

Preferably, the high-voltage shielding cover assembly comprises a circular truncated cone part and a cylindrical part, the circular truncated cone part of the high-voltage shielding cover assembly is butted with the first cable insulation shell, and the cylindrical part of the high-voltage shielding cover assembly is butted with the second cable insulation shell. The direction of the high-voltage shielding cover assembly can be better distinguished by dividing the high-voltage shielding cover assembly into the circular truncated cone and the cylinder, so that the high-voltage shielding cover assembly is convenient to install and use.

Preferably, the high-voltage shielding cover assembly is in a shape of a circular truncated cone, one end of the high-voltage shielding cover assembly is butted with the first cable insulation shell, and the other end of the high-voltage shielding cover assembly is butted with the second cable insulation shell. Through the structural design of the high-voltage shielding cover assembly in the shape of the circular truncated cone, the firmness of the whole high-voltage shielding cover assembly can be greatly improved.

The utility model has the advantages that: the advantages of the two prior technical schemes in the background art are combined, the defects are avoided, the intermediate joint can be stably used for connecting cables with different insulation outer diameters, the service life of the whole intermediate joint is effectively prolonged, the reducing intermediate joint can be stably used, and the cost is low.

Drawings

Fig. 1 is a schematic view of an assembly structure of the present invention;

FIG. 2 is a schematic sectional view of the conductor connecting pipe;

FIG. 3 is a cross-sectional view of one configuration of the high voltage shield assembly;

FIG. 4 is a schematic diagram of a partial structure of a high voltage shield assembly;

FIG. 5 is a schematic diagram of one configuration of a high voltage shield assembly;

FIG. 6 is a cross-sectional view of another configuration of the high voltage shield assembly;

FIG. 7 is another partial schematic view of the high voltage shield assembly;

fig. 8 is another structural schematic diagram of the high voltage shield assembly.

In the figure: 1. the cable comprises a first high-voltage cable, 2, a second high-voltage cable, 3, a first cable conductor, 4, a second cable conductor, 5, a first cable insulation shell, 6, a second cable insulation shell, 7, a conductor connecting pipe, 8, a high-voltage shielding cover assembly, 9, a first inner hole, 10, a second inner hole, 11, a first half piece, 12, a second half piece, 13, a metal pin and 14, a flexible metal wire.

Detailed Description

The invention is further described with reference to the accompanying drawings and the detailed description.

In the embodiment shown in fig. 1, a reducing intermediate joint for high-voltage cables is installed between a first high-voltage cable 1 and a second high-voltage cable 2, the first high-voltage cable 1 comprises a first cable conductor 3 and a first cable insulation shell 5 coated outside the first cable conductor 3, the second high-voltage cable 2 comprises a second cable conductor 4 and a second cable insulation shell 6 coated outside the second cable conductor 4, the outer diameter of the first cable conductor 3 is different from that of the second cable conductor 4, the outer diameter of the first cable insulation shell 5 is different from that of the second cable insulation shell 6, and the reducing intermediate joint comprises a conductor connecting pipe 7 and a high-voltage shield assembly 8, one end of the conductor connecting pipe 7 is connected with the first cable conductor 3, the other end of the conductor connecting pipe 7 is connected with the second cable conductor 4, the high-voltage shield assembly 8 is installed outside the conductor connecting pipe 7, the outer diameter of one end of the high-voltage shielding case assembly 8 is consistent with the outer diameter of the first cable insulation shell 5, and the outer diameter of the other end of the high-voltage shielding case assembly 8 is consistent with the outer diameter of the second cable insulation shell 6.

As shown in fig. 2, the conductor connecting pipe 7 is integrally formed, the conductor connecting pipe 7 includes a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are connected through a conical surface transition, a first inner hole 9 is provided in the first connecting pipe, the first cable conductor 3 is inserted in the first inner hole 9 of the first connecting pipe, a second inner hole 10 is provided in the second connecting pipe, the second cable conductor 4 is inserted in the second inner hole 10 of the second connecting pipe, and the first inner hole 9 is communicated with the second inner hole 10. The conductor connecting pipe 7 is made of a metal material which does not crack when it is deformed due to creep. The material of the first connecting pipe on the conductor connecting pipe 7 is consistent with that of the first cable conductor 3, and the material of the second connecting pipe on the conductor connecting pipe 7 is consistent with that of the second cable conductor 4.

As shown in fig. 3, 4, 5, 6, 7 and 8, the high-voltage shielding case assembly 8 includes a first half piece 11 and a second half piece 12, the shape of the first half piece 11 is the same as that of the second half piece 12, a plurality of metal pin holes are arranged at the edge of the first half piece 11, metal pins 13 matched with the metal pin holes are arranged at the edge of the second half piece 12, the first half piece 11 is mounted on the second half piece 12 through the matching of the metal pin holes and the metal pins 13, grooves are arranged on the inner side of the first half piece 11 and the inner side of the second half piece 12, and the conductor connecting pipe 7 is arranged in the groove of the first half piece 11 and the groove of the second half piece 12. The high-voltage shielding cover assembly 8 is made of a conductive material, at least one flexible metal wire 14 is arranged inside the high-voltage shielding cover assembly 8, and the high-voltage shielding cover assembly 8 is electrically connected with the conductor connecting pipe 7 through the flexible metal wire 14. As shown in fig. 3, 4 and 5, the high-voltage shield assembly 8 includes a circular truncated cone portion and a cylindrical portion, the circular truncated cone portion of the high-voltage shield assembly 8 is abutted with the first cable insulation housing 5, and the cylindrical portion of the high-voltage shield assembly 8 is abutted with the second cable insulation housing 6. In yet another embodiment, as shown in fig. 6, 7 and 8, the high-voltage shielding cover assembly 8 is in a truncated cone shape, one end of the high-voltage shielding cover assembly 8 is butted with the first cable insulation shell 5, and the other end of the high-voltage shielding cover assembly 8 is butted with the second cable insulation shell 6.

The nominal cross section of the conductors of two high-voltage cables which are butted is different, the outer diameters of the cable conductors are correspondingly different, and the outer diameters of the cable insulation shells are also different. The outer diameters of two ends of the conductor connecting pipe 7, which is matched with the high-voltage shielding cover assembly 8, are respectively equal to or slightly smaller than the outer diameters of the adjacent cable insulation shells on two sides. The high voltage shielding assembly 8 is made of conductive material, which may be aluminum alloy or copper alloy. The conductor connecting pipe 7 is required to be made of a metal material with special material, and when creep deformation is generated due to compression joint of a matched pressing clamp, the conductor connecting pipe 7 cannot crack. The inner hole of the conductor connecting pipe 7 needs to be of a reducing combination design, and comprises two inner holes with different diameters, which correspond to different cable conductor outer diameters respectively, so that differences exist. The design of the conductor connecting pipe 7 with different inner hole diameter sizes needs to ensure that the corresponding cable conductors with different outer diameters can be smoothly inserted, and the inner hole cannot be too large, so that the conductor connecting pipe 7 can be tightly and reliably connected with the cable conductors with different outer diameters in a crimping way when creep deformation is generated due to the crimping of a matched crimping tool. The material of the conductor connecting pipe 7 is the same as that of the cable conductor, for example, when both the two cable conductors are copper materials, the material of the conductor connecting pipe 7 is copper materials; when the two cable conductors are made of aluminum, the conductor connecting pipe 7 is made of aluminum; when the two cable conductors are made of copper material and aluminum material, the conductor connecting pipe 7 must be a copper-aluminum connecting pipe. The high-voltage shielding cover assembly 8 is two half pieces with the same appearance, and is matched and combined together through a plurality of metal pins 13 to form an integral shielding cover structure, and is positioned outside the conductor connecting pipe 7, and the inner diameters of two ends of the high-voltage shielding cover assembly 8 are slightly larger than the outer diameter of a conductor of a matched cable. At least one flexible metal wire 14, which can be a tinned braided copper wire with a small cross section, needs to be fixedly assembled in the high-voltage shielding case assembly 8, and the flexible metal wire 14 needs to be reliably fixed with the conductor connecting pipe 7 when the middle joint is installed, so that stable electrical connection is formed.

The structure of the intermediate joint can be an integral prefabricated intermediate joint, can be a wrapping type intermediate joint, and can also be other intermediate joints used for the high-voltage shielding case assembly 8. The design combines the advantages of the two prior technical schemes in the background technology and avoids the defects, so that the intermediate joint can be stably used for connecting cables with different insulation outer diameters, the service life of the whole intermediate joint is effectively prolonged, the reducing intermediate joint can be stably used, and the cost is low.

Claims

1. The utility model provides a reducing intermediate head for high tension cable installs between first high tension cable (1) and second high tension cable (2), first high tension cable (1) include first cable conductor (3) and cladding first cable insulation cover (5) in first cable conductor (3) outside, second high tension cable (2) include second cable conductor (4) and cladding second cable insulation cover (6) in second cable conductor (4) outside, the external diameter of first cable conductor (3) and the external diameter of second cable conductor (4) are different, the external diameter of first cable insulation cover (5) and the external diameter of second cable insulation cover (6) are different, characterized by, including conductor connecting pipe (7) and high voltage shield cover subassembly (8), the one end and the first cable conductor (3) of conductor connecting pipe (7) are connected, the other end and the second cable conductor (4) of conductor connecting pipe (7) are connected, high-voltage shield cover subassembly (8) install in the outside of conductor connecting pipe (7), the one end external diameter of high-voltage shield cover subassembly (8) is unanimous with the external diameter of first cable insulation shell (5), the other end external diameter of high-voltage shield cover subassembly (8) is unanimous with the external diameter of second cable insulation shell (6).

2. The reducing intermediate joint for the high-voltage cable as claimed in claim 1, wherein the conductor connecting pipe (7) is integrally formed, the conductor connecting pipe (7) comprises a first connecting pipe and a second connecting pipe, the first connecting pipe and the second connecting pipe are in transition connection through a conical surface, a first inner hole (9) is formed in the first connecting pipe, the first cable conductor (3) is inserted in the first inner hole (9) of the first connecting pipe, a second inner hole (10) is formed in the second connecting pipe, the second cable conductor (4) is inserted in the second inner hole (10) of the second connecting pipe, and the first inner hole (9) is communicated with the second inner hole (10).

3. The reducer union according to claim 2, wherein the material of the first connecting pipe of the conductor connecting pipe (7) is the same as the material of the first cable conductor (3), and the material of the second connecting pipe of the conductor connecting pipe (7) is the same as the material of the second cable conductor (4).

4. The reducer union according to claim 1, wherein, the high-voltage shielding cover component (8) comprises a first half part (11) and a second half part (12), the first half part (11) has the same shape as the second half part (12), a plurality of metal pin holes are arranged at the edge of the first half piece (11), metal pins (13) matched with the metal pin holes are arranged at the edge of the second half piece (12), the first half part (11) is arranged on the second half part (12) through the matching of a metal pin hole and a metal pin (13), grooves are arranged on the inner sides of the first half piece (11) and the second half piece (12), the conductor connecting pipe (7) is arranged in the groove of the first half piece (11) and the groove of the second half piece (12).

5. The reducer union adapter for high-voltage cables as claimed in claim 1, wherein the high-voltage shield assembly (8) is made of a conductive material, at least one flexible metal wire (14) is arranged inside the high-voltage shield assembly (8), and the high-voltage shield assembly (8) is electrically connected with the conductor connecting pipe (7) through the flexible metal wire (14).

6. The reducer union center for high-voltage cables as claimed in claim 1, 4 or 5, wherein said high-voltage shield assembly (8) comprises a circular truncated cone portion and a cylindrical portion, said circular truncated cone portion of said high-voltage shield assembly (8) is mated with said first cable insulation housing (5), and said cylindrical portion of said high-voltage shield assembly (8) is mated with said second cable insulation housing (6).

7. The reducer union center for high-voltage cables as claimed in claim 1, 4 or 5, wherein the high-voltage shield assembly (8) is in a shape of a truncated cone, one end of the high-voltage shield assembly (8) is butted with the first cable insulation shell (5), and the other end of the high-voltage shield assembly (8) is butted with the second cable insulation shell (6).