With the development of electricity and energy, various wires and cables are increasingly used in various fields of production and life. Cables are widely used in various fields, and the main uses are: power transmission, transportation, instrument measurement, control systems, communication transmission, solar and wind power generation, etc.cables and kits

With the rapid development of power cable buried laying projects, higher requirements are put forward for cable protection. The cable protection sleeve is made of polyethylene PE and high-quality steel pipes, which are pre-treated by sandblasting and shot blasting, dipped in plastic or coated, and heated and cured. Craft made.

 

The rated voltage of the cable is equal to or greater than the rated voltage of the network, and the maximum working voltage of the cable shall not exceed 15% of its rated voltage. In addition to using copper core cables in places where movement or severe vibration is required, aluminum core cables are generally used.cables and connectors

 

Ⅰ. Application fields of cables

 

1. Marine and submarine applications: used for submarine power transmission, offshore oil and gas exploration, marine scientific research, underwater communication and submarine data transmission, etc.

 

2. Transportation: used for traffic signal control, street lighting, subway and railway signal systems, electric vehicle charging equipment and aerospace electronic systems, etc.

 

3. Power Engineering: Cables are a key component in the transmission and distribution of electrical energy in power systems. Power cables are also used in projects such as grid extensions, urban power transmission, underground power lines and submarine cables.

 

4. Communication network: Optical fiber cables are used for communication transmission such as high-speed Internet, telephone network, cable TV and broadcasting.

 

5. Industrial automation: cables are widely used in the field of industrial automation. They are used to transmit control signals, sensor signals and power supplies, connecting various machines, equipment and automation systems.

 

6. Information transmission: The wires and cables used in the information transmission system mainly include local telephone cables, TV cables, electronic cables, radio frequency cables, optical fiber cables, data cables, electromagnetic wires, power communication or other composite cables, etc.

 

7. Instrument system: This part is applicable to almost all products except overhead bare wires, but mainly power cables, magnet wires, data cables, instrumentation cables, etc.

 

Ⅱ. Common faults of cables

 

1. Insulation aging: Over time, cable insulation materials may age and become brittle, resulting in a decline in insulation performance.

2. Insulation damage: The damage of insulation materials may be caused by external mechanical damage, aging, chemical corrosion and other reasons. Insulation damage can lead to a reduction in the insulation properties of the cable, increasing the risk of short circuits and fires.

3. External damage: The cable is damaged by external factors such as mechanical force, chemical corrosion, animal bites, etc., resulting in insulation damage and conductor exposure.

4. Fire: The cable insulation material burns or melts at high temperature, which may cause a fire.

5. Short circuit: A short circuit is an abnormal low impedance connection between conductors that causes current to bypass the intended circuit path. Short circuits can be caused by insulation breakdown, contact between conductors, or foreign matter.

6. Open circuit: The interruption of the conductor in the cable prevents the current from passing normally. Open circuits can be caused by broken conductors, loose joints, aging insulation, etc.

 

The most direct cause of cable faults is breakdown due to reduced insulation.smart cables

 

Ⅲ. Technological characteristics of cables

 

1. Abrasion resistance characteristics: cables may be subject to mechanical wear during laying and use, especially in scenes that need to be bent or frequently moved. Abrasion resistant properties extend the life of the cable.

2. Environmental resistance characteristics: cables need to be able to work under different environmental conditions, such as temperature, humidity, chemicals, ultraviolet rays, etc. Environmental resistance characteristics can ensure the reliability and stability of the cable under various harsh conditions.

3. Fire-resistant properties: The fire-resistant properties of cables refer to the flame resistance and propagation properties of cables under fire conditions.

4. Insulation properties: including the dielectric constant, dielectric strength, and withstand voltage capability of insulating materials.

5. Mechanical properties: including tensile strength, compressive strength, bending resistance, etc. of the cable. Cables need to have sufficient mechanical strength to withstand mechanical stress and environmental conditions during laying, installation and use.

6. Shielding characteristics: For communication cables, shielding characteristics are very important. Good shielding can reduce electromagnetic interference and signal crosstalk, improve communication quality and data transmission rate.

 

 

Ⅳ. Function of the cable

 

1. Sensors and measurement: cables are used to connect sensors and measurement equipment, and transmit information such as environmental parameters, physical quantities and data to monitoring systems or instruments.

 

2. Signal transmission: cables are used to transmit various signals, including voice, data and video signals. Communication cables such as fiber optic, coaxial and twisted pair are used in telephony, Internet connections, cable television and broadcasting.

 

3. Renewable energy: Cables play a key role in solar and wind power generation systems, delivering electricity converted from renewable energy to the grid.

 

4. Lighting and electrical equipment connection: cables are used to connect lighting equipment and other electrical equipment, such as lamps, power sockets, home appliances and industrial equipment, etc. They provide power and signal transmission to keep devices functioning properly.

 

5. Control and automation: Cables are used to transmit control signals and connect various machines, equipment and automation systems. In areas such as industrial automation, robotics, traffic signal control and building automation, cables play a key role in controlling and coordinating equipment.

 

Ⅴ. Classification of cables

 

1. Classification of environmental conditions

 

Outdoor cables: with weather resistance and corrosion resistance, suitable for outdoor environment and underground laying.

 

Indoor cables: Suitable for indoor installation, usually with fire and flame retardant properties.

 

2. Shielding type classification

 

Shielded Cable: Has a metal shield to reduce interference and electromagnetic radiation.

 

Unshielded cable: no shielding, suitable for non-interference environment or short distance transmission.

 

3. Conductor type classification:

Multicore cable: Consists of multiple conductors, typically used in control and communication cables, each carrying a different signal or function.

 

Single-core cable: Consisting of one conductor, it is often used for power transmission and signal transmission.

 

Frequently Asked Questions

 

1. How to distinguish between cables and wires?

Cable: Usually refers to a composite wire composed of multiple wires, wrapped in an insulation layer, and may have a protective layer, shielding layer, and outer sheath, etc. The structure and specifications of cables vary according to different uses, such as power cables, communication cables, control cables, optical cables, etc.

Wire: usually refers to a single wire, generally used to transmit electrical energy in buildings, industries, homes and other places.

 

2. Is the temperature of the cable important?

The temperature of the cable is very important. Cables will generate a certain amount of heat during operation, and this heat needs to be properly handled and controlled to ensure the normal operation and long life of the cable. The importance of cable temperature includes: safety, insulation performance, electrical performance, lifetime and reliability.

 

3. What are the general principles of cables?

Establish cable records and identification, appropriate selection of cable types, consideration of environmental conditions, compliance with standards and regulations, safe operation and regulatory management, etc.