25
Jul
The difference between overhead cables and insulated cables
Share:
The main difference between overhead cables and insulated cables in their structure, application scenarios, advantages and disadvantages, and safety.
Structure and application:
Overhead cable is an uninsulate, bare metal conductor, erected in the air, fixed to the tower by an insulator string, and insulated with air. Its disadvantage is that it occupies more land resources.
Insulated cable uses insulating medium to isolate the metal conductor from the outside world and can be laid on the ground or underground. It is suitable for scenes such as urban underground power grids, power station lead-out routes, and internal power supply of factories and mines where cables need to be protected from the external environment.
The structure of insulated cable consists of three parts: conductor, insulation and sheath. Different parts are made of different materials and have different functions.
The core is the channel for conducting current. Commonly used cable core materials are copper or aluminum, which have high conductivity.
The insulation layer can block the influence of high electric field on the conductor on the outside world. Common insulating materials include polyethylene, cross-linked polyethylene, ethylene propylene rubber, etc.
The sheath protects the cable core and insulation layer from external damage, moisture, penetration and corrosion.
Advantages and Disadvantages:
The advantages of overhead cables include low cost, and the disadvantage is that they occupy more land resources and affect the city's appearance. Its safety is better than that of power cables, and the failure rate is also low.
The advantages of insulated cables include that they occupy less land resources and do not affect the city's appearance. The disadvantage is that the cost is higher.
Safety:
In terms of safety, the safety of overhead cable is better than that of power cables, and its failure rate is also lower than that of power cables. Compared with overhead bare lines, overhead cables can greatly reduce various short-circuit faults and have good power supply safety performance.
Structure and application:
Overhead cable is an uninsulate, bare metal conductor, erected in the air, fixed to the tower by an insulator string, and insulated with air. Its disadvantage is that it occupies more land resources.
Insulated cable uses insulating medium to isolate the metal conductor from the outside world and can be laid on the ground or underground. It is suitable for scenes such as urban underground power grids, power station lead-out routes, and internal power supply of factories and mines where cables need to be protected from the external environment.
The structure of insulated cable consists of three parts: conductor, insulation and sheath. Different parts are made of different materials and have different functions.
The core is the channel for conducting current. Commonly used cable core materials are copper or aluminum, which have high conductivity.
The insulation layer can block the influence of high electric field on the conductor on the outside world. Common insulating materials include polyethylene, cross-linked polyethylene, ethylene propylene rubber, etc.
The sheath protects the cable core and insulation layer from external damage, moisture, penetration and corrosion.
Advantages and Disadvantages:
The advantages of overhead cables include low cost, and the disadvantage is that they occupy more land resources and affect the city's appearance. Its safety is better than that of power cables, and the failure rate is also low.
The advantages of insulated cables include that they occupy less land resources and do not affect the city's appearance. The disadvantage is that the cost is higher.
Safety:
In terms of safety, the safety of overhead cable is better than that of power cables, and its failure rate is also lower than that of power cables. Compared with overhead bare lines, overhead cables can greatly reduce various short-circuit faults and have good power supply safety performance.
