CN204947556U - The transition joint of a kind of 66 ~ 220kV aluminium conductor crosslinked cable - Google Patents

Abstract

The utility model discloses an intermediate joint for 66-220kV aluminum conductor cross-linked cables, which is characterized in that it includes a conductor connecting pipe fixedly connected to the cable conductor part, a stress cone arranged at the cable insulation and semi-conductive interface, a set The protective copper shell outside the stress cone, the protective shell arranged outside the protective copper shell, the cavity between the protective copper shell, the stress cone, the protective copper shell and the protective shell, the waterproof mixture in the cavity, the setting Corrosion protection layer on the end of the protective copper shell and the end of the protective shell. The utility model realizes the electrical connection of the aluminum conductors of the cables on both sides by rationally designing the structure and material of the conductor connecting pipe.

Description

An intermediate joint for cross-linked cables with 66-220kV aluminum conductors

technical field

The utility model relates to the design field of 66-220kV cross-linked power cable accessories, in particular to an intermediate joint for 66-220kV aluminum conductor cross-linked cables.

Background technique

In recent years, influenced by the international market, "saving copper with aluminum" has become one of the main technical development directions of the current power cable industry, and more and more cross-linked cables with aluminum conductors have been put into line construction. The wide application of cross-linked power cables has promoted the rapid development of cable accessories. Since the length of cables is limited by production equipment and transportation conditions, the development of urban power grids will require a large number of cable intermediate joints.

Due to the poor mechanical properties of aluminum itself, when the compression rate is too large, it is easy to cause the conductor to break; when the compression rate is too small, the cable conductor is easy to fall off from the guide rod due to insufficient crimping, causing local overheating when the line is running. to safety hazards. Therefore, the application of aluminum accessories in large cross-section cables is restricted, which seriously hinders the development of aluminum cables and their accessories.

Utility model content

Aiming at the above shortcomings, the utility model provides an intermediate joint for cross-linked cables with 66-220kV aluminum conductors. By rationally designing the structure and material of the conductor connecting pipes, the electrical connection of the aluminum conductors on both sides of the cables is realized.

The technical solution adopted by the utility model to solve the technical problem is: an intermediate joint for 66-220kV aluminum conductor cross-linked cable, which includes a conductor connecting pipe fixedly connected to the cable conductor part, and is arranged at the cable insulation and semiconducting interface. The stress cone, the protective copper shell set outside the stress cone, the protective shell set outside the protective copper shell, the cavity between the protective copper shell, the stress cone, the protective copper shell and the protective shell, and the cavity The waterproof mixture, the anti-corrosion layer set on the end of the protective copper shell and the end of the protective shell, and the heat shrinkable tube set on the outside of the cable to connect with the protective shell.

The conductor connection pipe is made of hardened aluminum material.

The middle part of the conductor connection pipe is set as a conductive solid block, the two sides of the conductor connection pipe are cylindrical, the middle positions of the left and right ends of the pipe body are respectively provided with hump-shaped contours, and the ends of the nozzle are chamfered.

The utility model uses a special material to process the conductor connection tube to withstand greater compression force, which improves the mechanical strength of the connection between the cable aluminum conductor and the conductor connection tube, and the mechanical strength of the cable aluminum conductor with a large cross-section after crimping also meets the requirements. ; Extending the length of the compressed part of the conductor connecting pipe also improves the flow capacity of the cable, making the operation of the intermediate joint safer and more stable.

The test results show that: compared with copper conductor cables, when aluminum conductor cables are compressed and connected, if the compression rate is reduced and the compression length is extended, the mechanical and electrical properties of the connected part can be enhanced. The most ideal state is to connect the above conductors to the tube The compression length is adjusted to 80-120mm, which increases the insertion length by 50-100%, and the optimal insertion inner diameter expands from ΦDmm to Φ(D+2.0)mm.

Description of drawings

Shown in Fig. 1 is the 66～220kV aluminum conductor XLPE cable of the present utility model is assembled schematic diagram with the middle joint;

Shown in Fig. 2 is the conductor connecting pipe of the present utility model and the cable connection schematic diagram;

Figure 3 is a schematic diagram of a section of the compression connection of the present invention.

detailed description

The utility model is described in detail below in conjunction with accompanying drawing and specific embodiment:

As shown in the figure, it is a specific embodiment of the utility model,

The utility model 66 ~ 220kV aluminum conductor cross-linked cable intermediate joint as shown in Figure 1, includes a conductor connection pipe 1 fixedly connected to the cable conductor part, a stress cone 3 arranged at the cable insulation and semi-conductive interface to generate a uniform electric field 1. The protective copper shell 4 arranged outside the stress cone 3 to support, fix and protect grounding. The protective shell 8 arranged outside the protective copper shell 4 is arranged between the protective copper shell 4 and the stress cone 3, between the protective copper shell 4 and the The cavity between the protective shells 8, the waterproof mixture 6 in the cavity, the anti-corrosion layer 7 arranged at the end of the protective copper shell 4 and the end of the protective shell 8 for protection and waterproofing, and a heat shrinkable tube 9, etc. .

The conductor connection pipe is made of superhard material, and the insertion length of the conductor connection pipe is increased from 50mm to 100mm, and the insertion inner diameter is increased from the outer diameter of the cable conductor D (mm) to the inner diameter of the cable conductor D + 2.0 (mm), In this way, while ensuring the current flow of the conductor connection part, the conductor connection part can also bear greater compression force.

The main implementation process of the compression connection (the schematic diagram of the connection between the conductor connection tube and the cable (Figure 2) and the schematic diagram of the compression connection section (Figure 3), clean the conductor surface of the compression part and the inner wall of the conductor connection tube, and then insert the processed conductor into the Conductor connection pipe, and make sure it is fully inserted, crimp with electro-hydraulic pliers and elliptical die, and then replace the circular die and rotate 90° before crimping. After the crimping is completed, grind and crimp the outside of the conductor connection pipe with a file With burrs on the surface, the entire crimping process can be completed.

Of course, the above description is not a limitation of the present utility model, and the present utility model is not limited to the above-mentioned examples, and changes, modifications, additions or replacements made by those skilled in the art within the essential scope of the present utility model are also acceptable. Should belong to the protection scope of the utility model.

Claims (3)

1. An intermediate joint for 66-220kV aluminum conductor cross-linked cables, characterized in that: it includes a conductor connecting pipe fixedly connected to the cable conductor part, a stress cone arranged at the cable insulation and semi-conductive interface, a stress cone arranged at the stress cone The outer protective copper shell, the protective shell set outside the protective copper shell, the protective copper shell, the stress cone, the cavity between the protective copper shell and the protective shell, the waterproof mixture in the cavity, the protective copper shell The corrosion protection layer at the end of the shell and the end of the protective shell, and the heat shrinkable tube arranged on the outside of the cable and connected with the protective shell. 2. An intermediate joint for 66-220kV aluminum conductor cross-linked cables according to claim 1, characterized in that: the middle part of the conductor connecting pipe is set as a conductive solid block, and the parts on both sides of the conductor connecting pipe are cylindrical , the middle positions of the left and right ends of the pipe body are respectively provided with hump-shaped contours, and the ends of the pipe mouth are chamfered. 3. An intermediate joint for 66-220kV aluminum conductor cross-linked cables according to claim 1, characterized in that: the conductor connecting pipe is made of hardened aluminum material.