The function and use of wire and cable in life
The main function of wire and cable is to transmit electric energy, signal and realize electromagnetic conversion, such as power cable, overhead line, etc. to transmit electric power, such as coaxial cable and enameled wire to realize electromagnetic conversion and electromagnetic wave generation, transmission and application, must be Use wire and cable as connection and transmission parts or as winding material for the host. The different types of wires and cables have different uses in life, and the status of wires and cables in life is very important. Next, let's take a look at the differences between them.
Power system: The wire and cable products used in the power system mainly include overhead bare wires, bus bars (bus bars), power cables (plastic cables, oil-paper power cables (basically replaced by plastic power cables), rubber sheathed cables, overhead insulated cables) , branch cables, electromagnetic wires and electrical equipment wires and cables for power equipment.
1. Overhead bare wires
Overhead bare wires and cables are the main components of transmission lines, and their function is to transmit current and ensure electric power. It is mainly used in transmission sites with short distances and short distances between supports in urban areas. In addition to this, these conductors are also widely used in coastal areas due to their corrosion resistance. Because it is erected on the tower, the wire is subject to its own weight and external loads such as wind, snow, ice, etc., and is also corroded by chemical substances contained in the surrounding air. Therefore, the conductor is required not only to have excellent electrical performance, sufficient mechanical strength and corrosion resistance, but also to be as light and inexpensive as possible.
2. Overhead insulated wire and cable
The power supply system of overhead insulated wire and cable has high reliability, and its function is to transmit current and ensure electric power. Aerial cables can be built on all types of tower poles or along walls. In special cases, they can also travel through the woods, and they can be fixed on the main pole immediately with hardware. The selection of overhead cables can greatly reduce various common short-circuit faults (especially the common short-circuit faults common to bare bare power transmission lines). Compared with bare bare power transmission lines, the equipment failure rate is 4-6 times lower.
The selection of overhead wires and cables greatly reduces personal safety and electric shock accidents. When the overhead cable is connected to the power supply, when the body or other small animals accidentally touch the surface of the cable insulation, if the cable does not penetrate, it will be harmful to people and people. Animals are not easy to cause adverse effects.
3. Rubber sheathed wire and cable
Rubber sheathed wire and cable is also called rubber cable, which is generally a blend of natural rubber and polyvinyl chloride as a flame retardant at home. Rubber cables generally include general-purpose rubber-sheathed flexible cables, electric welding machine cables, submersible motor cables, radio device rubber-sheathed cables and photographic light source rubber-sheathed cables. Rubber sheathed cables are mobile power cables that are widely used in various electrical equipment such as household appliances, electric machinery, electrical installations and appliances, and can be used in indoor or outdoor environmental conditions.
The rubber sheathed cable is made of multiple strands of fine copper wire as the inner conductor, and is covered with rubber insulation and rubber sheath. It is soft and movable, and its high temperature resistance is about 200 degrees Celsius. According to the mechanical external force that the rubber sheathed cable bears, the product structure can be divided into three categories: light, medium and heavy. In general: light-duty rubber-sheathed cables are used for household appliances and small electric equipment, requiring softness, lightness, and good bending performance; medium-duty rubber-sheathed cables are used in agricultural electrification in addition to industrial applications, and heavy-duty cables are used in port machinery, for example , Searchlights, household large-scale hydraulic irrigation and drainage stations and other occasions. Waterproof rubber sheathed cables and cables for submersible pumps are mainly used for submersible motors.
Information transmission system: The wires and cables used in the information transmission system mainly include local telephone cables, TV cables, electronic cables, radio frequency cables, optical cables, data cables, electromagnetic wires, power communication or other composite cables.
4. PVC insulated wire
PVC insulated cables and wires are also known as cloth wires, and their products are divided into unsheathed cables for fixed wiring, sheathed cables for fixed wiring, light unsheathed flexible cables, general-purpose sheathed flexible cables, installation wires and shielding Wires, special-purpose sheathed flexible cables, PVC insulated flame-retardant/fire-resistant cables and other products. Copper/aluminum core PVC insulated wire is suitable for small electric tools, various instruments, electric lighting devices, etc. of household appliances with AC rated voltage of 450/750V and below. It is the most frequently used wire type in home decoration.
Mechanical equipment, instrumentation systems: Except for overhead bare wires, almost all other products are used, but mainly power cables, magnet wires, data cables, instrumentation cables, etc.