1. Classification of insulated wires
A: There are often the following kinds of insulated wires: PVC insulated wires, PVC insulated flexible wires, nitrile polyvinyl chloride mixture insulated flexible wires, rubber insulated wires, agricultural directly buried aluminum core plastic insulated wires, rubber insulated cotton yarn textile flexible wires, PVC insulated nylon sheathed wires, power and lighting PVC insulated flexible wires.
2. What kind of occasion is the cable bridge suitable for?
Answer: Cable bridge is suitable for indoor and outdoor overhead laying power cables and control cables in general industrial and mining enterprises, and can also be used for telecommunications, radio and television and other departments to set up indoor and outdoor.
3. Types of cable accessories
A: The commonly used electrical accessories include cable terminal junction box, cable intermediate junction box, connecting pipe and wiring terminal, steel plate wiring slot, cable bridge, etc.
4. The meaning of cable middle connector
A: The device that connects the cable with the conductor, insulating shield and protective layer of the cable to connect the cable line is called the cable adapter.
5. What is the main electrical connector?
A: The main electrical connection is the connection between the main electrical equipment and the bus in the power plant and substation, including the connection between the main bus and the plant power system according to certain functional requirements.
6. What provisions should be followed when selecting the section of power cable?
A: The selection of power cables should comply with 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 should be equal to or greater than the maximum continuous current of the power supply load;
(3) The core section should meet the stability requirements of short circuit in the power supply system;
(4) Check whether the calculated 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.
7. What are the advantages of cross-linked polyethylene cable and oil-paper cable?
A:
(1) Easy to install, because it allows for a small minimum bending radius and light weight;
(2) not limited by the line drop;
(3) Good thermal performance, high allowable working temperature, large transmission capacity;
(4) The cable accessories are simple and dry structure;
(5) Simple operation and maintenance, no oil leakage problem;
(6) the price is low;
(7) High reliability and low failure rate;
(8) Fewer manufacturing processes, simple technology, remarkable economic benefits.
8. What are the requirements for fixing the clip of AC single-core cable? Why?
A: The fixture should have no iron parts to form a closed magnetic circuit, this is because when the cable core through the current, the magnetic force line around it, the magnetic force line is proportional to the size of the current through the core, if the use of iron parts and other magnetic materials, according to the electromagnetic induction, will produce eddy current in the iron parts to make the cable heat, or even burn the cable. Therefore, it is not possible to use iron as the fixed fixture of single-core AC cable.