What is Medium Voltage Cable?

Medium voltage cable refers to power cables with a rated voltage between 1kV-35kV, which are used for power transmission and distribution at medium current or medium voltage levels. In the power system, medium voltage cables are an important link between substations and distribution networks, and play an important role in energy transmission and signal transmission.

Structure of medium voltage cables

The structure of medium voltage cables usually covers multiple components such as conductors, insulation layers, conductor shields, insulating core wires, metal sheaths, metal shielding sleeves and outer sheaths. The conductor part must be made of high-quality copper or aluminum to ensure high efficiency and quality of power transmission. The insulation layer is mostly made of materials such as cross-linked polyethylene (XLPE), which is widely used in medium voltage cables due to its excellent electrical insulation performance and good chemical stability.

In the cable structure, the function of the conductor shielding layer is to reduce the resistance and inductance caused by the irregular movement of electrons, thereby maintaining the stability of the cable transmission signal. The electromagnetic shielding layer is used to resist external electromagnetic interference to prevent it from adversely affecting the transmission performance of the cable.

As the protection and shielding structure of the cable, the metal sheath not only provides the necessary mechanical support and protection, but also resists external pressure. The metal shielding sleeve further provides electric field shielding for the cable to ensure the accuracy and stability of power transmission. The outer sheath material is mostly polyvinyl chloride (PVC), etc., which is used to resist environmental factors such as mechanical damage, chemical erosion, ultraviolet radiation and oxidation, and ensure the overall performance and service life of the cable.

Application of medium voltage cables

Medium-voltage cables are widely used in power systems and are usually used in power transmission and distribution, generators, distribution devices, transformers, and water conservancy projects. Specific application occasions and needs can choose different varieties and specifications according to actual conditions to meet the needs of safe and stable power transmission and distribution.

Maintenance of medium voltage cables

The maintenance of medium-voltage cables mainly includes daily inspection, cleaning and maintenance, especially at the cable terminals, waterproof, insulation and electrical performance tests should be carried out regularly to detect and eliminate hidden dangers in time.

In addition, the storage and use of medium voltage cables also need to be paid attention to, and factors such as high temperature and direct sunlight that affect the insulation performance and service life of the cables should be avoided to ensure that the cables can serve the power system for a long time and stably.