Types and applications of cables
Flame-retardant rubber sheathed cable
1. The use of flame-retardant rubber sheathed cable
This product is a series of mine-used rubber sheathed flexible cables. It is suitable for power connection of shearers and similar equipment with rated voltage Uo/U of 1.9/3.3KV and below. Mainly used in coal mines.
2. Conditions of use
The long-term allowable working temperature of the core is 65℃, and the minimum bending radius of the wire is 6 times the diameter of the cable. The yellow sheathed cable shall not be exposed to sunlight for a long time.
Nuclear grade cable
Scope of application
· This product is suitable for control and signal connection cables used in nuclear power plant rated voltage Uo/U 0.6/1kV control system network.
· The allowable long-term working temperature of nuclear-grade cable conductor is 90℃, the maximum temperature of the cable conductor during short-circuit does not exceed 250℃, and the duration does not exceed 5 seconds.
· The ambient temperature when laying cables should not be lower than 0°C.
· The allowable bending radius during cable laying is:
— Non-armored cables should not be less than 6 times the diameter of the cable
— Cables with armored or copper tape shielding results should not be less than 12 times the cable diameter
— Flexible cables with shielding structure should not be less than 6 times the diameter of the cable.
· When the conductor's long-term allowable working temperature is not more than 90℃, the cable's appraisal life should not be less than 40 years.
· The finished cable should meet the requirements of Class A bundled combustion test specified in the GB/T18380.3 standard.
· Finished cable smoke density: light transmittance is not less than 70%.
· Radiation resistance: 25×104Gy
· Halogen-free: When non-metallic materials are burned, the acidity (expressed in PH value) of the escaped gas should be greater than 4.3; the conductivity should not be greater than 10μS/mm.
Bare wires and bare conductor products
The main features of this category of products are:
Pure conductive metal, without insulation and sheath, such as steel core aluminum stranded wire, copper-aluminum bus bar, electric locomotive wire, etc.; The processing technology is mainly pressure processing, such as smelting, calendering, drawing, stranding/squeezing stranding, etc.; The products are mainly used in suburbs, rural areas, user main lines, switch cabinets, etc.
power cable
The products are mainly used in the transmission of strong electric energy in power generation, distribution, transmission, transformation, and power supply lines. The passing current is large (tens of amperes to several thousand amperes), and the voltage is high (220V to 500kV and above).
Communication cables and optical fibers
With the rapid development of the communications industry in the past two decades, products have also developed at an astonishing speed. From the simple telephone and telegraph cables in the past, it has developed to thousands of pairs of voice cables, coaxial cables, optical cables, data cables, and even combined communication cables. The structure size of this kind of products is usually small and uniform, and the manufacturing precision is high.
Magnet wire (winding wire)
Mainly used in various motors, instruments, etc.
Flexible fireproof cable
1. Excellent fire resistance, and the fire resistance level not only meets the international GB12666.6A category at 950℃ for 90min. It can also meet the requirements of British BS6387-1994 at 650°C for 3h for Class A, 750°C for 3h for Class B, and 950°C for 3h for Class C. At the same time, it can withstand water spray and mechanical impact during combustion.
2. Long continuous length Whether it is a single-core or multi-core cable, the length can meet the power supply length, and the limit length can reach 2000m.
3. The cross-section of a single-core cable with large cross-section can reach 1000mm2. The cross-section of the multi-core cable can reach 240mm2.
4. It is flexible, the cable can be coiled on the cable reel, the bending radius is ≥20D, and D is the outer diameter of the cable.
5. Smokeless and non-toxic when burned, and inorganic material "non-combustible" is used for insulation. It will not produce any harmful gas during combustion, and it will not cause secondary pollution. It can be called an environmentally friendly green product.
6. The cross-sectional capacity is too large, and the cable not only has a large cross-sectional flow, but also has a large overload capacity. According to the wiring requirements, the surface temperature of the cable is usually ≤70°C. If the wiring is not touchable or in contact with combustible building materials, the temperature of the cable sheath can reach 105°C. The allowable working temperature of the fireproof cable can reach 250℃ when overloaded.
7. Corrosion-resistant, organic insulated fire-resistant cables sometimes need to wear plastic pipes or iron pipes. Plastics are easy to age and become brittle, and iron pipes are easy to rust; The fireproof cable has a copper sheath and does not need to be piped, and the copper sheath has good corrosion resistance.
8. No electromagnetic interference. When fireproof cables are laid in the same shaft with signal and control wires and cables. The fireproof cable is shielded by the copper sheath and will not interfere with the information transmitted by the signal control wire and cable.
9. Good safety. In addition to the normal power supply in the flame, the fireproof cable can start the fire extinguishing equipment to reduce the fire loss, and it is also particularly reliable for personal safety. The copper sheath is a good conductor and the best grounding wire, and it is continuous to the full length of the cable, which greatly improves the sensitivity and reliability of grounding protection.
10. Long service life. Inorganic insulating material, high temperature resistance, and not easy to age. Its life span is many times longer than that of organic insulated cables. Under normal working conditions, its life span can be equivalent to that of buildings.
11. The transportation and installation of flexible fireproof cables include installation.
New cable products
Derivatives/new products of wires and cables are mainly due to different application occasions, different application requirements, convenience of equipment, and requirements for reducing equipment costs. It is produced by adopting new materials, special materials, or changing product structure, or improving process requirements, or combining different types of products.
Use different materials: for example, flame-retardant cables, low-smoke zero-halogen/low-smoke and low-halogen cables, termite-proof, mouse-proof cables, oil-resistant/cold-resistant/temperature-resistant cables, etc.
Combination products: such as OPGW, etc.
Convenient installation and reduce equipment costs: for example, prefabricated branch cables, etc.
Cable application
Power Systems
The main wire and cable products used in the power system are:
Overhead bare wires, bus bars (bus bars), power cables (plastic cables, oil-paper cables (basically replaced by plastic power cables),
Rubber sheathed cables, overhead insulated cables),
Branch cables (replace part of the busbars), electromagnetic wires, and electrical equipment wires and cables for power equipment, etc.
Information transfer
Wires and cables used in information transmission systems mainly include: local telephone cables, television cables, electronic cables, radio frequency cables, optical fiber cables, data cables, electromagnetic wires, power communications or other composite cables.
Instrument system
Except for overhead bare wires, almost all other products have applications in this part, but mainly power cables, magnet wires, data cables, instrumentation cables, etc.
