There are generally three types of cable materials for overhead insulated cables of 1kV and below: weather-resistant PVC(cable-aislado), polyethylene, and cross-linked polyethylene. The choice of which cable is appropriate is a problem worthy of study in today's power grid reconstruction and construction. These three cable materials, if only from the technical performance, the best is cross-linked polyethylene, followed by weather-resistant polyvinyl chloride, and again polyethylene. What are the exhibition measures for overhead insulated cables?
Overhead insulated cable landing and spread protection measures:
1. Overhead insulated cable landing protection measures
1.1 Reasonably choose the position of the stretch field, try to reduce the distance between the conductor and the length of the wire;
1.2 The contact between the wire and the ground must be padded with a soft material such as crepe, especially in the rocky area. The wire must not be in contact with the ground;
1.3 When retracting the remaining wires, it is forbidden to drag and drop, and a special person is commanded to cooperate with each other to prevent the occurrence of gold hooks, loose strands and avoid friction between the wires and the ground, wires and tools;
1.4 Special monitoring shall be provided at the landing of the conductor to prevent the conductor from being subjected to vehicle pressure, person stepping or machine damage;
2. Wire protection measures during wire spreading
2.1 Check the reel before releasing the line and remove the nail on the reel;
2.2 The pedestal should be arranged in a fan shape so that the bobbin outlet line is aligned with the tension machine into the guiding wheel to prevent the wire from grinding with the side of the bobbin;
2.3 Strengthen the inspection and maintenance work of the line-up tools, and ensure that:
2.3.1 Release pulley - flexible rotation, no defects. The trough type meets the standard requirements;
2.3.2 Grounding block - moderately elastic, grooved and wire matched;
2.3.3 crimping tube protection sleeve - reasonable structure and firm installation;
2.3.4 Rotary Connector - Reliable strength, good bearings and flexible rotation.
2.4 In the stretch field, crossover, should pay attention to straighten out the wire to prevent cross wear;
2.5 Maintain the normal operation of the command communication system, strengthen the construction monitoring, prevent the wires from hopping and cross the worn wires;
2.6 During the process of paying off the line, the operation of the tractor should be stable. Especially when there is cross-line wind, it should avoid large fluctuations to prevent splitting of the split wires. The tension machine should be operated smoothly and keep the tension of the sub-wires balanced to prevent the wires from jumping and pulling. Flip; Recommended products: power cable
2.7 When the display is placed, there should be a special person to take care of the bobbin. When the wire is close to the edge of the bobbin, the wire should be pushed in the middle of the reel to avoid the wire on the edge of the reel. The wire lead-out direction is perpendicular to the spool axis;
2.8 When the wire sleeve connector is wound around the wire reel after the wire is changed, the net sleeve connector is wrapped with a crepe cloth to avoid scratching the adjacent wire;
2.9 Overhead insulated cables shall be inspected regularly for the working equipment such as the pay-off pulleys to ensure normal operation. If it is calculated that double-sliders are required to be hung, the double-sliders must be hung.