CN201758269U - Cable accessory for electrified railway - Google Patents

Abstract

The utility model provides a cable accessory for an electrified railway, which includes a cable and a cable terminal accessory. The cable terminal accessories include a cold-shrinkable sheath tube, a constant force spring, a stress cone, a cold-shrinkable terminal head, a sealing tube, and a terminal. The cold-shrinkable sheath tube is installed on the copper shielding layer from the fracture to the outside The outer side of the partial section of the sheath; the constant force spring clamps the grounding wire; the cold shrinkable terminal head is installed on the outer side of the partial section of the outer semiconducting layer and the wire core insulation layer close to the fracture of the outer semiconducting layer, and its root is connected with the cold shrinkable The top of the sheath tube is sleeved; the sealing tube is sleeved on the outside of the cold-shrinkable terminal and the adjacent part of the terminal. The utility model has the characteristics of convenient installation, no oil, explosion-proof, small size, light weight, easy maintenance and the like.

Description

Cable accessories for electrified railways

technical field

The utility model relates to cable accessories, in particular to special cable accessories for 27.5/48kV railways. the

Background technique

Throughout the history of railway development in various countries in the world, the vigorous development of electrified railways is an inevitable trend. It is estimated that by 2015, the number of countries and regions building high-speed electrified railways in the world will reach 23, and the mileage of high-speed electrified railways will exceed 30,000km. By then, my country's electrified railway mileage will rank second in the world only after Russia. Moreover, it will enter the world's advanced ranks in terms of electrification rate, electrification double-track rate, proportion of railway traffic carried by electrified railways, technical equipment level of electrified railways, and train operating speed. The electric railway rated voltage 27.5kV cable accessory product of the utility model is used on the transmission and transformation lines of the electrified railway with a voltage level of 27.5/48kV. Equipment injection molding. The product is easy to install and has excellent performance, and is suitable for heavily polluted areas. the

Utility model content

In order to solve the problems in the prior art, the utility model provides a cable accessory for electrified railway. the

A cable accessory for an electrified railway, comprising a cable and a cable terminal accessory, the end of the cable is stripped to expose a core, an insulating layer, an outer semiconducting layer, a copper shielding layer, and an outer sheath in sequence, and the cable terminal accessory includes a cold Shrinkable sheath tube, constant force spring, stress cone, cold shrinkable terminal head, sealing tube, terminal, said cold shrinkable sheath tube is installed on the outside of the partial section of the outer sheath from the fracture of the copper shielding layer; said constant The force spring clamps the grounding wire tightly; the cold-shrinkable terminal head is installed on the outside of the partial section of the outer semiconducting layer and the wire core insulation layer close to the fracture of the outer semiconducting layer, and its root is socketed with the top of the cold-shrinkable sheath tube; The sealing tube is set on the outer side of the cold shrink terminal and the adjacent part of the terminal. the

As a further improvement of the utility model, the stress cone is compounded with insulating glue. the

As a further improvement of the utility model, the material of the terminal is copper, and a layer of silver is plated on the surface. the

As a further improvement of the utility model, the cold-shrinkable sheath tube is pre-stretched within the elastic range, and inserted into the support bar to join and fix it. the

The beneficial effects of the utility model are:

1. The imported silicone rubber used for accessories has the advantages of high strength, high elasticity, anti-corona, anti-leakage, anti-aging, etc., which ensures the high quality of the product and the reliability of long-term operation; it is suitable for heavily polluted areas. the

2. The conductive silicone rubber stress cone is compounded inside the accessory insulation, and the stress control is not affected by the system frequency change, which reliably improves the electric field distribution at the cut-off point of the cable shield. the

3. Always provide a constant and lasting radial pressure on the cable body after installation, the partial discharge is small, and it "breathes" with the cable body. the

4. It has the characteristics of convenient installation, oil-free, explosion-proof, small size, light weight, and easy maintenance. the

Description of drawings

Figure 1 is a stripping and cutting diagram of the utility model 27.5/48kV fully cold-shrinkable single-core indoor (outdoor) cross-linked cable terminal head;

Fig. 2 is an exploded schematic view of the outdoor terminal of the cable terminal accessory of the present invention;

Fig. 3 is a schematic diagram of the structure of the utility model fully cold-shrinkable single-core indoor (outdoor) cross-linked cable terminal after installation;

Fig. 4 is a schematic diagram of the enlarged structure of the stress cone and the terminal main body of the utility model. the

The names of the components in the figure are as follows:

Outer sheath 1, copper shielding layer 2, outer semiconducting layer 3, insulating layer 4, wire core 5, cold shrinkable sheath tube 101, stress cone 102, terminal body 103, sealing tube 104, terminal 106, umbrella group 107, Constant force spring 108, cold-shrink terminal head 109, positioning phase color ribbon 201, filling glue 202, ground wire 203, elastic sealant 204. the

Detailed ways

The utility model will be further described below in conjunction with the accompanying drawings and specific embodiments. the

The full cold shrink technology is also called the pre-expansion technology, that is, the elastic rubber is pre-stretched within the elastic range, and then inserted into the support bar and fixed. When installing, you only need to pull out the plastic support strip, and the elastic body will quickly shrink and tighten on the cable body. The utility model is a fully cold-shrinkable terminal head, and its stress cone material adopts liquid semiconducting silicon rubber, and the dielectric constant, dielectric strength, insulation resistance and dielectric loss factor of the material are kept stable for a long time. the

Electric field stress dispersion is controlled by geometric stress cone (as shown in Figure 4), and the electric field distribution of stress cone structure is optimized by finite element method. The stress cone and the insulating glue are combined into one body. Through this stress control method, the electric field distribution of the outer insulation of the cable terminal tends to be divergent and uniform, thereby increasing the discharge voltage of the outer insulation. the

The technical solution adopted by the utility model is: to propose a fully cold-shrinkable cable terminal, including a cable (as shown in Figure 1) and cable terminal accessories, and the end of the cable is stripped to expose the core 5, the insulating layer 4, the outer half Conductive layer 3, copper shielding layer 2, outer sheath 1, the cable terminal accessories include cold shrink sheath tube 101, constant force spring 108, stress cone 102, cold shrink terminal head 109, sealing tube 104, terminal 106, all The cold-shrinkable sheath tube is installed on the copper shielding layer from the fracture to the outside of the outer sheath part; the constant force spring clamps the grounding wire so that it can be in good contact with the copper shielding to ensure the grounding effect; The stress cone and the insulating glue are combined into one, the electric field stress distribution is optimized by the finite element method, and the stress control method is controlled by the geometric method, so that the electric field distribution of the outer insulation of the cable terminal tends to be divergent and uniform, thereby increasing the discharge voltage of the outer insulation; The cold-shrinkable terminal head is installed outside the partial section of the outer semiconducting layer and the wire core insulation layer close to the fracture of the outer semiconducting layer, and its root is socketed with the top of the cold-shrinkable sheath tube; the sealing tube is sleeved on the cold-shrinkable terminal and the terminal The outer side of the adjacent part; the material of the terminal is copper, and a layer of silver is plated on the surface, which can strengthen its conductivity and make it not easy to corrode (as shown in Figure 2 and Figure 3). the

The installation process of 27.5/48kV fully cold-shrinkable single-core XLPE cable terminal is as follows: 

1. Pretreatment cable

First, according to the stripping and cutting dimension drawing, (measure 500-550mm, L: terminal hole depth) strip the outer sheath of the cable, keep 70-75mm of copper shielding at the top of the sheath fracture, and keep 30-35mm of the outer semiconducting layer, according to the drawing Cut off the top main insulation. At the fracture of the outer semiconducting layer, cut out a 45-degree groove with a knife, wrap 3 layers of PVC tape on the insulating layer close to the port, smooth the groove with sandpaper, and remove the PVC tape. the

2. Install the ground wire

Wrap one end of the ground wire around the copper shield, clamp the ground wire with a constant force spring, and wrap 3 layers of PVC tape on the constant force spring to ensure that the spring will not loosen. the

3. Wrapping filler and sealant

Wrap a layer of elastic sealant about 35-40mm below the constant force spring, place the ground wire on it, and then wrap a layer of elastic sealant to cover the ground wire. Wrap two layers of PVC tape on the constant force spring to ensure that the spring will not loosen. the

4. Install the cold shrink sleeve

Put it into the cold shrinkable sheath tube, and the upper end is flush with the copper shield, and pull the plastic support bar counterclockwise to make it shrink naturally. the

5. Determine the installation benchmark of the terminal head

Measure 60-65mm from the fracture of the semi-conductive layer, and make a mark with PVC tape as the installation reference for the cold-shrinkable terminal head. the

6. Install the cold shrink terminal head

Clean the insulation with cable cleaning paper, then apply a layer of silicone grease. Insert the cold shrink terminal head and locate it at the PVC mark (installation reference point). Pull off the plastic support bar counterclockwise to allow the terminal head to shrink naturally. (Note: The indoor terminal head is directly connected to step 7, and the outdoor terminal head is covered with two cold-shrinkable sheath tubes: overlap the terminal head 30-35mm, put it into the cold-shrinkable sheath tube, pull out the plastic support bar counterclockwise, Let the sheath shrink naturally.)

7. Crimp conductive terminals

Crimp the terminal and fill the gap between the terminal and the main insulation with filler compound. Then, apply an elastic sealant to reinforce the seal. the

8. Install the cold shrinkable sealing tube

Insert the cold-shrink sealing tube, pull out the plastic support strip, make the sealing tube shrink naturally, and the installation is complete. the

The above content is a further detailed description of the utility model in combination with specific preferred embodiments, and it cannot be assumed that the specific implementation of the utility model is only limited to these descriptions. For a person of ordinary skill in the technical field to which the utility model belongs, without departing from the concept of the utility model, some simple deduction or substitutions can also be made, which should be regarded as belonging to the protection scope of the utility model. the

Claims (5)

1. an electric railway electric cable accessories comprises cable and cable termination annex, it is characterized in that:

The end of described cable is opened stripping and is exposed core, insulating barrier, outer semiconductive layer, copper shield, oversheath successively, described cable termination annex comprises shrinkage protecting pipe, constant force spring, stress cone, shrinkage terminals, sealed tube, terminal, and described shrinkage protecting pipe is installed on copper shield outside incision position plays, arrives the oversheath local segment; Described constant force spring tightens earth connection; Described shrinkage terminals are installed on outside outer semiconductive layer, the local segment of core insulating barrier near outer semiconductive layer fracture, the top socket of its root and shrinkage protecting pipe; Described sealed tube is loaded on shrinkage terminal and the terminal outside in abutting connection with the position.

2. electric railway electric cable accessories according to claim 1 is characterized in that: described stress cone and insulating cement are combined into one.

3. electric railway electric cable accessories according to claim 1 is characterized in that: the material of described terminal is a copper, is coated with one deck silver on the surface.

4. electric railway electric cable accessories according to claim 2 is characterized in that: the material of described terminal is a copper, is coated with one deck silver on the surface.

5. according to any described electric railway electric cable accessories of claim 1 to 4, it is characterized in that: described shrinkage protecting pipe struts in elastic range in advance, is inserted in support bar and adds fixing.

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