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The company’s heat-shrinkable power cable accessories have passed the test of the Electrical Equipment Quality Inspection Center of the Ministry of Electric Power Industry and meet the requirements of the GB8114-95 standard.
heat-shrinkable power cable accessories series include: 1KV rubber and plastic, cross-linked cable terminal and intermediate joint; 10KV cross-linked cable terminal and intermediate joint; 10KV oil-immersed cable terminal and intermediate joint; 35KV cross-linked cable terminal.1 The allowable range of ambient temperature when using heat-shrinkable power cable accessories: -40℃—+70
2 General requirements for installation of heat-shrinkable power cable accessories:2.1 Oil-immersed cross-linked cable joints must be continuously constructed from the beginning of lead cutting to sealing. In order to avoid moisture, the heat shrinkable head of 10KV and below cable should be finished within 6 hours.
2.2 The following parts must be kept dry and clean during the production process of the cable terminal head and the intermediate joint: the lead cut of the cable and the insulating paper of the whole package and the core part; the insulating materials and tools for construction; the hands of the construction personnel should be kept clean at all times.
3 Preparation before installation:
3.1 Before making the cable head, it is necessary to prepare a complete set of tools, and the construction personnel should be familiar with the use, inspection and precautions of various tools.
3.2 Before making heat-shrinkable cable heads, prepare all required heat-shrinkable materials and supporting materials, check whether the materials are qualified, and determine whether the heat-shrinkable materials used are suitable according to the cable structure and specifications.3.3 Before making heat-shrinkable cable heads, the following preparations should be done on site:
3.3.1 The construction site has sufficient light, and the installation lighting fixtures must comply with safety regulations.3.3.2. The construction site should be kept clean and dry.
3.3.3 Protective shelters should be set up for outdoor construction, and workbenches should be set up for high-altitude operations.
3.3.5 The construction site should comply with safety and fire prevention regulations, and there should be fire extinguishing equipment on site, and fire and explosion prevention must be paid attention to when using blowtorches.
4 Technical requirements for heat shrinkage:
4.1 It is recommended to use a propane spray gun for heating tools. The flame is yellow and the temperature is moderate. The heating area is large. The blue flame of gasoline has a high temperature. Keep away from the material properly and control the temperature to avoid burning.4.2 All heat-shrinkable materials are made of polymer materials through a special process. When the temperature reaches 110 ℃-130 ℃, the material begins to shrink, and the shrinkage rate is greater than 50%. The material will not be affected in a short time at 140℃, but local long-term high temperature overheating will damage or even burn the material and affect the material performance.
4.3 When starting to shrink the pipe, the flame should approach slowly, move around it to ensure uniform radial shrinkage, and then extend slowly, and the flame will move toward the shrinking direction to preheat the pipe, which is conducive to uniform shrinkage. Follow the recommended initial shrinkage position and direction in the installation procedure, shrinking from bottom to top will help to eliminate gas and enhance sealing.
4.4 In order to ensure the close bonding and bonding strength between the heat-shrinkable material and the coating material, before inserting each layer of pipe fittings, the coated part and the adhesive sealing section should be preheated, and then cleaned with cleaning paper.Remove flame soot deposits and make good interlayer contact.
4.5 The shrinkage pipe fittings should be smooth and wrinkle-free, and the original structure outline can be clearly seen. A small amount of sealant squeezed out at the sealing part indicates sealing.
5 Installation conditions and requirements:
5.1 The installation of heat-shrinkable accessories should be at an ambient temperature of 0°C or higher and relative humidity below 70%. Avoid condensation and moisture on the insulating surface. Remedial measures should be taken when the ambient temperature is low and the humidity is too high.5.2 Do not cut the heat shrinkable tube at will.
5.3 The parts of the heat shrinkable accessories that are in contact with the metal parts (such as lead packages, terminals) should be carefully roughened and cleaned with cleaning agents.5.4 When the cable end is in place, the wire core should be avoided to move, so as not to affect the sealing effect.
5.5 Construction cannot be carried out in rainy and foggy weather. Remedial measures should be taken if the cable is found to have entered water or damp.5.6 During the construction process, it is strictly forbidden to damage the cable sheath and insulation.
5.7 When the heat-shrinkable intermediate connector is not cooled, it is not allowed to move the cable.
