Mining mobile communication cableInstall overhead insulated wire lightning protection clamps on insulated wires near insulators based on the principle of lightning strikes causing wire breakage. Mining mobile communication cables use wire clamps with puncture structures to penetrate the insulation layer of the wire and make close electrical contact with the insulated conductor; The lower part of the wire clamp is equipped with an arc resistant electrode, and there is also an arc starting electrode installed on the iron crossbar under the insulator and well grounded.

Adjust the distance between the ignition electrode and the arc resistant electrode of the mining mobile communication cable, so that in the event of lightning, discharge occurs between the arc resistant electrode and the ignition electrode, and fix the power frequency arc root generated by lightning strikes on the arc resistant electrode for combustion, thereby protecting the wire from burns. The mining mobile communication cable adopts a puncture structure, which is easy to install. If equipped with specially developed flame-retardant insulation protective equipment, it can further improve the safety of the line.

Select the corresponding model of FHJC insulated wire lightning protection clamp for mining mobile communication cables based on the nominal cross-sectional area of the wire. When used for unidirectional power supply lines, it is installed on the load side of the insulator (away from the power supply side). If used for bidirectional power supply lines, it is recommended to install one on both sides of the insulator. inMining mobile communication cable50mm on each side of the joint is cut into a conical shape, and the distance between the conical and cylindrical boundaries of the cables on both sides is 350mm. The core wire at the joint has a stripped outer layer length of about 30mm and is connected using a copper crimping tube to ensure the quality of the crimping.

Mining mobile communication cables are wrapped with plastic wrap and tape to improve the insulation between the core wires. Before repairing, the power supply must be disconnected first, and then the damaged parts of the mining high-voltage rubber sleeve cable and the mineral powder and oil stains on the surrounding surface must be eliminated. The tapered surface on both sides of the rubber cable joint is roughened with a wooden file to expose a fresh surface and kept clean. The selection of molds for mining mobile communication cables is one of the key factors in ensuring joint vulcanization treatment. The molds made from high-pressure polyethylene sheets are disposable consumables, suitable for use in factories and flat areas, and have a long demolding time.

Drill three M20 screw holes in the middle position of the self-made mold length direction for the mining mobile communication cable, one of which is used to install the feeding funnel, and the other two are used as exhaust holes to ensure smooth gas discharge between the mold and the packing. The mold is split in half, and its inner surface is galvanized to improve the smoothness of the cable joint surface. When direct lightning or induced lightning overvoltage acts on bare wires, causing insulator flashover, the continuous power frequency short-circuit current arc moves along the wire in the direction away from the power source under the action of electric force, and the probability of serious burns to the wire is very small.

Unlike mining mobile communication cables, when lightning strikes insulated wires, lightning overvoltage first breaks through the insulation layer and causes insulator flashover. The broken insulation layer is in the shape of a pinhole,Mining mobile communication cableThe continuous power frequency short-circuit current is obstructed by the surrounding insulation, and the arc root can only burn at the pinhole. In a very short time, the wire will be neatly burned off.