New energy cable manufacturer Questions and answers on common sense of wires and cables in cables:
1. What kinds of wires and cables are commonly used according to their uses?
Answer: It can be divided into bare wire, insulated wire, heat-resistant wire, shielded wire power cable , control cable, communication cable, RF cable, etc.
2. What kinds of insulated wires are there?
Answer: There are often several kinds of insulated wires as follows: PVC insulated wires, PVC insulated cords, nitrile PVC mixture insulated cords, rubber insulated wires, agricultural underground directly buried aluminum core plastic insulated wires, rubber insulated cotton yarn textile cords, PVC insulated nylon sheathed wires, PVC insulated cords for power and lighting, etc.
3. Where is the cable tray suitable for?
Answer: The cable bridge is applicable to the indoor and outdoor overhead laying of power cables and control cables in general industrial and mining enterprises, as well as the indoor and outdoor erection of telecommunications, radio and television departments.
4. What are the cable accessories?
Answer: Common electrical accessories include cable terminal junction box, cable intermediate junction box, connecting pipe and terminal, steel plate junction slot, cable bridge, etc.
5. What is a cable intermediate joint?
Answer: The device that connects the cable with the conductor, insulation shield and protective layer of the cable to connect the cable line is called the cable intermediate joint.
6. What is the main electrical wiring?
Answer: The main electrical connection is the connection mode of main electrical equipment and bus in power plants and substations, including the connection mode of main bus and auxiliary power system according to certain functional requirements.
7. What regulations should be followed when selecting the section of power cable?
Answer: The selection of power cables should follow the following principles:
(1) The rated voltage of the cable shall be greater than or equal to the rated voltage of the power supply system at the installation point;
(2) The continuous allowable current of the cable shall be equal to or greater than the maximum continuous current of the power supply load;
(3) Core section shall meet the stability requirements of power supply system in case of short circuit;
(4) Check whether the voltage drop meets the requirements according to the cable length;
(5) The minimum short-circuit current at the end of the line shall enable the protection device to operate reliably.
8. What are the advantages of XLPE cable and oil paper cable?
Answer:
(1) Easy to install, because it allows small minimum bending radius and light weight;
(2) Not limited by line drop;
(3) Good thermal performance, high allowable working temperature and large transmission capacity;
(4) Simple cable accessories, all of which are of dry structure;
(5) Simple operation and maintenance without oil leakage;
(6) Low price;
(7) High reliability and low failure rate;
(8) There are few manufacturing processes, simple process, and significant economic benefits.
9. What are the requirements for fixing clamps for AC single core cables? Why?
Answer: The clamp should have no iron parts to form a closed magnetic circuit. This is because when the power cable core passes through the current, a magnetic line of force is generated around it. The magnetic line of force is proportional to the current passing through the core. If magnetic materials such as iron parts are used, according to the electromagnetic induction, eddy currents will be generated in the iron parts to heat the cable, or even burn the cable. Therefore, iron parts cannot be used as the fixing fixture of single core AC cables. The laying of power cables also follows the same technical specifications and principles.
