CN103956691B - Method for manufacturing cross-linked polyethylene insulated cable head - Google Patents

Abstract

The invention discloses a method for manufacturing a cross-linked polyethylene insulated cable head. The manufacturing process of the cross-linked polyethylene insulated cable head includes: manufacturing environment selection, cable moisture-proof treatment, cable local flashover prevention treatment, cable grounding treatment, cable head installation and Cable ends are heat-shrinkable insulated. The cable head manufacturing process adopted in the present invention has the characteristics of strong pertinence, clear operation, strong operability, standardized operation, and easy to learn and understand. It can effectively standardize the manufacturing behavior of XLPE insulated cable heads, and facilitates the communication The control of the production quality of polyethylene insulated cable heads improves the stability of the quality of the cable heads. Improve the efficiency of cable head production and reduce boring loss.

Description

A kind of manufacturing method of cross-linked polyethylene insulated cable head

technical field

The invention relates to a method for making a cross-linked polyethylene insulated cable head, which belongs to the technical field of power transmission connection.

Background technique

With the increasing scale of the power system, the workload of laying power cables increases. In the laying of power cables, cross-linked polyethylene is used because of its allowable temperature rise, large carrying capacity, good dielectric properties and suitable for high drop Even the characteristics of vertical laying have been widely used, but with the increasing demand for power supply and the increasing power load of users, the diameter of XLPE cables is getting larger and the insulation requirements of power cables are also increasing. High, which greatly increases the difficulty and labor intensity of cable laying construction. At the same time, in the laying of power cables, it is often necessary to rely on making a large number of cable heads to connect the power cables. Due to the current cable head production In the process, there is no uniform production method for XLPE cable head, so the quality of the produced cable head is greatly affected by the level of construction personnel, and the construction personnel lack professional and systematic learning and training, resulting in the failure of the produced cable head The efficiency is low, the material waste is serious and the quality is unstable, and the power supply failure caused by the quality of the cable head occurs from time to time, which seriously threatens the safety of power supply and electricity use.

Contents of the invention

The object of the present invention is to overcome the above disadvantages and provide a method for making a cross-linked polyethylene insulated cable head.

To achieve the above object, the present invention is achieved through the following technical solutions:

A method for manufacturing a cross-linked polyethylene insulated cable head, the manufacturing process of the cross-linked polyethylene insulated cable head includes the following steps:

Step 1: Select the production environment to ensure that the temperature at the construction site is above 0°C and the relative humidity is below 70%;

Step 2: cable moisture-proof treatment, cut the cable insulation end into a tapered shape, clean the residue on the processed surface and apply insulating power grease, and then wrap the self-adhesive sealing tape, and the self-adhesive sealing tape is tightly wrapped without gaps ;

Step 3: Anti-local flashover treatment of the cable, strip off the semiconductor shielding layer at least 12 cm long at the cable head, and apply insulating power grease after cleaning the residue on the processing surface at the stripped semiconductor shielding layer, and then install the copper stress tube, Among them, the contact length between the installed copper stress tube and the copper shielding layer is at least 3 cm;

Step 4: Cable grounding treatment, welding the copper shielding layer and armored layer of the cable to the grounding wire respectively. Re-welding is required when the specified value is reached, and cold water is used to cool down when welding;

Step 5: Install the cable head. When the cable is connected to the conductor of the cable head, crimping is used, and the depth of the crimping hole is 5 mm;

Step 6: heat-shrink insulation of the cable head, cover the connected cable head with the heat-shrinkable insulation tube of the cable head, and heat it. The time is 5 seconds to 30 seconds, and the production of the cable head is completed after natural cooling.

In the first step, the insulating end of the cable is cut into a tapered shape, and the length of the tapered surface is at least twice the length of the right-angled side of the insulating end of the cable;

In the fourth step, the copper shielding layer and armor layer of the cable are welded to the grounding wire respectively. The welding point is oval, 10-25mm long and 20mm wide.

After cleaning the residues on the processing surface in the first step, the second step and the third step, the working surface is smooth and flat, and the cleaning direction is one-way cleaning from the insulating section to the semiconductor layer.

The cable head manufacturing process adopted in the present invention has the characteristics of strong pertinence, clear operation, strong operability, standardized operation, and easy to learn and understand. The control of the production quality of polyethylene insulated cable heads improves the stability of the quality of the cable heads. Improve the efficiency of cable head production and reduce boring loss.

Description of drawings

Fig. 1 is process flow chart of the present invention.

detailed description

As shown in Figure 1, a method for manufacturing a cross-linked polyethylene insulated cable head, the manufacturing process of the cross-linked polyethylene insulated cable head includes the following steps:

Step 1: Select the production environment to ensure that the construction environment temperature of the cable head is 20°C and the relative humidity is 50%;

Step 2: cable moisture-proof treatment, cut the cable insulation end into a tapered shape, clean the tapered surface with gauze and a lint-free towel, apply insulating power grease, and then wrap a self-adhesive sealing tape, which is wrapped with a self-adhesive seal There is no gap between the strips, and the end of the cable insulation is cut into a tapered shape, and the length of the tapered surface is at least 3 times the length of the right-angled side of the cable insulation end;

Step 3: Anti-local flashover treatment of the cable, strip off the 15 cm long semiconductor shielding layer at the cable head, clean the surface of the stripped semiconductor shielding layer, remove the residue on the processed surface and apply insulating power grease, and then install the copper stress tube , where the contact length between the installed copper stress tube and the copper shielding layer is 5 cm;

Step 4: Cable grounding treatment, solder the copper shielding layer and armored layer of the cable to the grounding wire respectively, where the grounding wire is a copper wire with a diameter of 16mm², and the welding point is oval, 15mm long and 20mm wide. The insulation value of the cable needs to be measured before and after welding. When the insulation value is lower than the specified value, re-welding is required, and cold water is used to cool down during welding;

Step 5: Install the cable head. When the cable is connected to the conductor of the cable head, crimping is used, and the depth of the crimping hole is 5 mm;

Step 6: heat-shrinkable insulation of the cable head, wrap and heat the connected cable head with the heat-shrinkable insulation tube of the cable head, the heating temperature is 100°C, the heating range is between 100 mm and 200 mm, and the heating time is 15 seconds , Natural cooling completes the production of the cable head.

Claims (4)

1. a kind of cross-linked polyethylene insulated cable head preparation method, it is characterised in that：The cross-linked polyethylene insulated cable head system Comprise the steps of as method：

The first step：Production environment is selected, it is ensured that job site temperature is more than 0 DEG C, relative humidity is below 70%；

Second step：Cable damp-proof treatment, by cable insulation end taper is whittled into, and after the residue of clearing up and processing face and smears insulated electro Power fat, then looping self-adhesion band, closed seamless gap wherein between looping self-adhesion band；

3rd step：The anti-local flashover of cable is processed, and divests at end at least semi-conductive shield of 12 centimeter lengths, and is being divested Insulating power fat is smeared after the residue of clearing up and processing face at semi-conductive shield, then copper stress tube is installed, wherein install copper should Solenoid is at least 3 centimetres with the contact length of copper shield；

4th step：Cable grounding process, by cable of copper shield layer and armor respectively with ground connection wire bonding, wherein ground wire is line Footpath is not less than 16mm²Copper cash, be both needed to before and after welding measure cable insulation value, insulation values be less than setting when need to weld again, Lowered the temperature using cold water during welding；

5th step：End is installed, using crimping when cable is connected with end conductor, and it is 5 millimeters to crimp hole depth；

6th step：End pyrocondensation is insulated, and is coated the end for connecting with end pyrocondensation insulation tube, and is heated, and is heated Temperature is 110 DEG C -140 DEG C, and heated perimeter is that between 100 millimeters -200 millimeters, the heat time is -30 seconds 5 seconds, naturally cold But manufacturing cable head is completed.

2. a kind of cross-linked polyethylene insulated cable head preparation method according to claim 1, it is characterised in that：Described Cable insulation end is whittled into 2 times that taper its conical surface length is at least cable insulation end right angle edge lengths by two steps.

3. a kind of cross-linked polyethylene insulated cable head preparation method according to claim 1, it is characterised in that：Described Cable of copper shield layer and armor are respectively ellipse with ground wire welded contact in four steps, long 10-25 millimeters, wide 20 millimeters.

4. a kind of cross-linked polyethylene insulated cable head preparation method according to claim 1, it is characterised in that：Described Working face is smooth after the residue of clearing up and processing face in one step, second step and the 3rd step, and clear up direction be from insulating end to Semiconductor layer direction is unidirectionally cleared up.