QWhich aspects should be considered when choosing the cross section of a power cable?A(1) The long-term allowable working current of the cable;
(2) Thermal stability once short circuited;
(3) The voltage drop on the line cannot exceed the allowable working range.
QHow Do You Find A Company That Produces ABC Cable?AThey will have both overhead and underground cables available.They produce very durable cables.You can get aerial bunched cable price list of great factory here.By working with companies that understand how to effectively manufacture these cables, in China you can obtain affordable ABC cables.
QWhy are high voltage power lines not insulated?A1、The voltage flowing in the high-voltage power line is very high, the current is very large, it is easy to generate heat, it will burn the insulation skin, and even break down the insulation.
2、The high-voltage power line is very long, and the bare conductor can reduce weight.
3、The high-voltage power line are generally erected in air, with erection height requirements, and not easy to reach. As long as they meet the safety distance requirements,bare conductor will not cause danger.
Hope our answer can be helpful to you.
QWhy use non-magnetic materials for single-core armored cablesAA When a single-core cable is switched on and off by alternating current or direct current, a corresponding alternating magnetic field will be generated around the cable, and an induced current will be generated in the metal material. This current flows inside the metal material, much like a vortex of water, so it is called a vortex. Electric current, referred to as eddy current. The thermal effect of the eddy current can heat the metal material in a short time. If the heat cannot be dissipated in time, it will cause the cable insulation layer to melt or accelerate the aging, and the insulation performance will weaken and cause the cable to break down.
Armored steel tape has good magnetic permeability and can be magnetized under the action of a very small magnetic field to generate eddy currents. Single-core cables should be armored with non-magnetic materials, such as stainless steel tape, copper tape, aluminum tape or non-magnetic metal wire armor.
In addition, single-core cables are easy to use finished glyphs during construction. Single-core cables try to avoid magnetic materials, such as iron pipes, iron clamps, etc., which can form a closed circuit.
In addition, for a three-core cable, the alternating magnetic field generated by the three-core phase relationship cancels each other out, so that the vector sum of the induced current is 0, and no magnetic field lines pass through the armor. Therefore, steel tape armor can be used.
QWhat are the measures for cable fire prevention?A(1) Use flame-retardant cables;
(2) Use fireproof cable tray;
(3) Use fireproof paint;
(4) Fire partition walls and fire baffles are installed at cable tunnels, mezzanine exits, etc.;
(5) Overhead cables should avoid oil pipelines and explosion-proof doors, otherwise local pipes or heat insulation and fire prevention measures should be taken.
QWhat should be paid attention to during the transportation and handling of cables?ADuring transportation, loading and unloading, cables and cable reels should not be damaged. It is strictly forbidden to push the cable reels directly from the vehicle. Generally, cables should not be transported and stored flat.
Before transporting or rolling the cable reel, ensure that the cable reel is firm, the cable is wound tightly, the oil pipe between the oil-filled cable and the pressure oil tank should be fixed without damage, the pressure oil tank should be firm, and the pressure indication should meet the requirements.