Power cables are cables used to transmit or distribute high-power electrical power in power systems. With the development of petrochemical industry around the world, plastic insulated power cables have become an important category of low-voltage power cables because of their simple manufacturing process and convenient construction and maintenance. However, defects such as bumps, scratches, crushes, and breakdowns are inevitably generated during the plastic insulation extrusion process. In order to ensure fixed-length production, reduce waste, and ensure that the electrical properties of the finished cable meet the standard requirements, it is necessary to find suitable insulation. Damage repair method.
1 <br> <br> heat welding repair method using a heat welding method is a suitable electrical power soldering iron, hot iron with the insulating fusion. 1.1 Low-voltage PVC Insulated cable Polyvinyl chloride (PVC) material is a thermoplastic material and should be used as a repair to the damage of the cable insulation layer. In order to ensure and strengthen the electrical and mechanical properties of the repair site, insulation tapes are used to make single-layer overlapping wrappings around the repair site, and the packets must be leveled.
1.2 low voltage XLPE insulated cable <br> <br> XLPE material is of a thermosetting material, the insulating molecule mesh silane crosslinking curing. Before the insulated wire core boiled water cross-linking process, the insulation damage repair is repaired by heat welding method, and then the transparent plastic tape is used to wrap the repaired area to prevent the repaired area from falling off; after the insulated wire core boiled water cross-linking process, the insulating layer is damaged. It should be repaired by hot welding method first, and then high-pressure self-adhesive tapes with a withstand voltage class of 35kV should be used for overlapping wrapping, and high pressure tape wrapping must be smooth.
2 repair method <br> <br> heat shrinkable tube shrink tube repair method is to shrink the size of the sleeve at a suitable point defects, and thermal shrinkage defects tight.
Whether the insulating material is made of thermoplastic PVC material or thermosetting cross-linked polyethylene material, the insulated core with a nominal cross section of less than 10 mm2 should be repaired with a heat shrinkable tube. After the heat shrinkable tube is repaired, it is wound with an insulating tape.
3 Comparative repair method <br> <br> patch repair method by heat welding tools such as soldering iron, the insulating layer can achieve the performance level of a complete cable, but the repair process is relatively complicated, it requires the operator to have a higher technical level.
For a core with a small cross-section, if the repair is performed using a heat-welding method, it is difficult to ensure the quality of the repair. A heat-shrinkable tube repair method should be adopted.
In order to ensure that the electrical performance of the repaired insulated wire core satisfies the standard requirements, a spark test of the insulating layer must be carried out to ensure that the finished product voltage is 3.5kV/5min withstand voltage test. The above repair method is only applicable to a small range of insulation damage. For serious defects such as scratches, crushes, and bumps, repairs must not be carried out in order to ensure product quality.
1 <br> <br> heat welding repair method using a heat welding method is a suitable electrical power soldering iron, hot iron with the insulating fusion. 1.1 Low-voltage PVC Insulated cable Polyvinyl chloride (PVC) material is a thermoplastic material and should be used as a repair to the damage of the cable insulation layer. In order to ensure and strengthen the electrical and mechanical properties of the repair site, insulation tapes are used to make single-layer overlapping wrappings around the repair site, and the packets must be leveled.
1.2 low voltage XLPE insulated cable <br> <br> XLPE material is of a thermosetting material, the insulating molecule mesh silane crosslinking curing. Before the insulated wire core boiled water cross-linking process, the insulation damage repair is repaired by heat welding method, and then the transparent plastic tape is used to wrap the repaired area to prevent the repaired area from falling off; after the insulated wire core boiled water cross-linking process, the insulating layer is damaged. It should be repaired by hot welding method first, and then high-pressure self-adhesive tapes with a withstand voltage class of 35kV should be used for overlapping wrapping, and high pressure tape wrapping must be smooth.
2 repair method <br> <br> heat shrinkable tube shrink tube repair method is to shrink the size of the sleeve at a suitable point defects, and thermal shrinkage defects tight.
Whether the insulating material is made of thermoplastic PVC material or thermosetting cross-linked polyethylene material, the insulated core with a nominal cross section of less than 10 mm2 should be repaired with a heat shrinkable tube. After the heat shrinkable tube is repaired, it is wound with an insulating tape.
3 Comparative repair method <br> <br> patch repair method by heat welding tools such as soldering iron, the insulating layer can achieve the performance level of a complete cable, but the repair process is relatively complicated, it requires the operator to have a higher technical level.
For a core with a small cross-section, if the repair is performed using a heat-welding method, it is difficult to ensure the quality of the repair. A heat-shrinkable tube repair method should be adopted.
In order to ensure that the electrical performance of the repaired insulated wire core satisfies the standard requirements, a spark test of the insulating layer must be carried out to ensure that the finished product voltage is 3.5kV/5min withstand voltage test. The above repair method is only applicable to a small range of insulation damage. For serious defects such as scratches, crushes, and bumps, repairs must not be carried out in order to ensure product quality.
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