When we consider the selection of high-voltage wires for power supply lines, the main principles are to ensure power supply safety, reduce costs, and have reasonable technical designs. So what should be paid attention to when choosing high-voltage wires, this article will introduce in detail.

                        How to choose high voltage bare conductor wire and cable?

       When choosing a high-voltage cable, generally consider the cross-section, and then compare the types, prices, and maintenance convenience of various cable materials. In addition, it is also necessary to consider thermal stability and choose materials with high safety and obvious effects.

                                          
一、 Selection of high voltage cables
1. The cross-section of the cable should not be smaller than the current-carrying cross-section
   When installing high-voltage bare conductor, safety is always very important. Multiple factors should be considered when selecting the cross-section. Generally, the length of the cable, wear and tear, wire pressure, starting frequency of the motor, etc. are considered for comprehensive trade-offs.
2. The universal cable itself also has a very good effect
   The price of general-purpose cables is relatively cheap, and the maintenance is relatively convenient, and the update speed is relatively fast. Most of the four-core cables are low-voltage cables, and the insulation is not enough. They are only used in 10KV to 10KV environments, and three-core cables can be selected. When choosing which cable to use, pay attention to its voltage bearing capacity, and try not to choose some material types that exceed the load of the cable itself, so as not to affect the quality and effect of use.
3. Consider thermal stability
   The thermal stability of the cable needs to be corrected. If it is a simple circuit to be calibrated, it is usually necessary to refer to the short-circuit current, system operation mode, impedance, etc., and to refer to the system parameters and weigh it according to the local power supply situation.
二、The cause of the failure of the high voltage cable
   The failure of high-voltage cables may be due to poor site conditions, certain scratches on the surface, or poor construction operations. Therefore, rigorous operation is required, and construction is carried out in combination with site conditions to ensure good efficacy and avoid various problems.
1. Poor site conditions
     If the aerial triplex high-voltage cable fails, it may be the cable and the interface. The environment and work requirements in the factory are relatively high. If the humidity and temperature of the environment are not well controlled, and there is even a lot of dust, the quality of the construction is often not particularly good. Therefore, Strict testing must be carried out before leaving the factory to ensure that these materials have good stability.

                                              
2. Scratches appear on the surface
     During the construction process, if there are systematic scratches on the surface, causing damage to the sand filter or semiconductor particles, they may enter the insulator. Sometimes the joints are exposed to the air, absorb a lot of moisture, and malfunction during operation, so it is necessary to prevent such problems.
3. Not doing a good job in construction
    If the operation is not performed according to the requirements during the installation process, it will often lead to problems such as insufficient airtightness of the joints and loosening. Second, without good sealing and protection, the water resistance will be weakened.

Due to poor heat dissipation, high-voltage bare conductor cables are easily damaged when passing large currents in a short period of time. When selecting a high-voltage cable, the stability of the cable operation in the event of a short circuit needs to be considered. The selection of high-voltage cables is generally based on the principles of economy, voltage loss, stability during short-circuit, and whether it will generate heat after long-term work. Because high-voltage cables do not move frequently, and most of them have high mechanical strength, it is generally impossible to check their mechanical strength.