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Basic structure of power cable
Release time:
2021-11-01
The third side of the power cable power supply is the core (conductor). The outer side of the core is phase insulation and filler, and the outer side is three-phase blanket insulation. The insulation layer of the package is covered with a lead package, and the outer layer of the lead package is a protective layer such as steel armor and PVC sheath.
Power cableThe third side of the power supply is the wire core (conductor). The outer side of the core is phase insulation and filler, and the outer side is three-phase blanket insulation. The insulation layer of the package is covered with a lead package, and the outer layer of the lead package is a protective layer such as steel armor and PVC sheath.
Allowable value of bending radius of power cable. The bending radius of the cable is related to its diameter, and the allowable value of the bending radius is not less than the multiple of the cable diameter: 15 times for three-core oil-immersed insulated cables and 25 times for single-core cables; the warpage of oil-immersed paper-insulated lead-coated cables is 30 times higher than 40 mm and 25 times lower than 40mm. Rubber insulated cable is 10 times.
The role of power cable shielding and grounding wire. The shielding layer is divided into inner shield and outer shield. They are all in order to make the cable conductor and the insulation layer, the cable insulation layer and the inner sheath contact well, and eliminate the increase of the surface electric field strength caused by the unsmooth surface of the conductor and the inner sheath. Typically, the surface of the conductor is wrapped with metallized paper tape or semiconductive paper tape. The purpose of installing a ground wire in a power cable is to protect the cable from insulation breakdown or large fault currents passing through the core wire. The induced voltage of the metal sheath may cause insulation breakdown, arcing and burning of the metal sheath.
The basic structure of the power cable. The outer sheath of the cable is generally composed of an inner sheath, an armored sheath and an outer sheath. The inner lining is located between the armor layer and the inner sheath, and its function is to prevent the inner sheath from being corroded and damaged by the armor layer when the cable is bent. The armor layer is outside the inner lining, and its function is to reduce the influence of mechanical force on the cable, so that the mechanical force acting on the cable is borne by the armor layer. The outer coating layer is outside the armor layer, and its function is to prevent the armor layer from being eroded. Therefore, the role of the outer sheath of the power cable is to protect the inner sheath from external influence and mechanical damage.
After the power cable has been used for a certain period of time, it needs to be checked regularly, so what problems should be paid attention to? Keep the machine clean and tidy. For example, some waste products generated in the production process should be concentrated and disposed of quickly. In particular, some oil stains, water or materials should not be placed at will. In addition, pay attention to whether there is abnormal sound or vibration during the operation of the machine, and regularly check and tighten the fasteners. If it is found that the lines of the old buildings are flooded or wet, especially the lines are in disrepair and aging, please ask an electrician to repair them immediately.
Power cable manufacturers, high voltage cable manufacturersI would like to remind you that for lines that are easily soaked in floods, electricians should be required to move the lines and take overhead moisture-proof measures. On rainy days, if there is a power outage, cut off the power immediately. Please ask the electrician to check the reason and assign special personnel to deal with it.
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Yincun Economic Development Zone, Renqiu City, Cangzhou City, Hebei Province