EVCOME EV charging stations for better life---Top EV charging stations manufacturers & suppliers in China.
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EVCOME EV charging stations for better life---Top EV charging stations manufacturers & suppliers in China.
With the development of wire and cable production technology, more wires and cables with different functions are constantly pouring into the market. There are many types of cables, but the most basic ones can be divided into low-voltage cables and high-voltage cables, but how should they be distinguished? 1. The structure can be seen. There are many layers of high-voltage cables, and the outermost layer is armor, shielding layer, insulation layer, conductor, etc. Low-voltage cables usually separate the outermost layer, including insulation or conductors. 2. The insulation layer of high-voltage cables is thicker, and the insulation layer of low-voltage cables is thinner. The insulation layer of low-voltage cables is generally within 3mm, and the insulation layer of high-voltage cables is generally above 5mm. 3. You can see the nameplate on the outermost layer of the cable. The relevant parameters of the cable are generally printed on the outermost layer of the cable, including the cable model, cross-sectional area, rated voltage, length and other parameters. The difference between high-voltage cables and low-voltage cables is mainly reflected in the following aspects: 1. Different voltage levels. According to "GB/T2900.50-2008 Electrical Terminology for Power Generation, Transmission and Distribution General Terms", the voltage lower than 1KV (including 1KV) is defined as low voltage, and 1KV-330KV is called high voltage. Therefore, those with a rated voltage lower than 1KV are called low-voltage cables, and those with a rated voltage lower than 1KV-330KV are called high-voltage cables. 0.4KV and 10KV voltage level cables are very common in our work and life. Second, the structure is different. High-voltage cable: high-voltage 15KV copper core XLPE insulated PVC sheathed steel tape armored three-core 70 square cable (YJV22-8.7/15KV-3*70) 1. Stranded copper conductor: conductor for transmitting electric energy, composed of Stranded hard wires are twisted together. 2. Conductor shielding layer: Since the conductor is twisted by multiple hard wires, there are gaps on the surface, which will cause uneven electric field and prone to partial discharge. Therefore, it is filled with conductive non-metallic soft materials to ensure perfect fit with the insulation layer, so that the electric field is uniform and the life of the cable is improved. 3. Insulation layer: Since the electrical gap between the 10KV exposed conductors is 125mm, the gap between the two conductors in the cable is very small, so it is necessary to use cross-linked polyvinyl chloride material with better performance to play the main insulating role. The thickness of the insulating layer of the 8.7/15KV model is generally not less than 4.5mm. 4. Insulation shielding layer: Similarly, since the direct combination of the insulation layer and the outer sheath will also have a gap, a conductive semiconductor layer is added outside the insulation layer to unify the electric field and prevent partial discharge. 5. Metal shielding layer: In order to ensure reliable grounding of the semiconductor layer, a metal shielding layer is outsourced. The metal shielding layer is directly grounded to leak the distributed capacitive current between the cable and other conductors, and at the same time shield part of the electromagnetic interference to prevent interference from other equipment. 6. Filling material: In order to eliminate the mutual inductance between the three-phase cables, it is necessary to arrange the three-phase cables into a symmetrical character shape, and the filling material completes the internal remaining space to ensure the stability of the core and the mechanical strength of the cable. 7. Wrapping tape: The material is mostly polyvinyl chloride, and the non-woven fabric mainly protects the cable from external influences, and the packaging core and filler are not loose in a round shape. 8. Inner protective layer: The inner protective layer is a protective layer covering the cable insulation to prevent the insulating layer from moisture, mechanical damage, light and chemical aggressive media. 9. Steel tape armor layer: Armored cables are used to increase the mechanical strength of the cables and improve anti-corrosion capabilities, and are designed for areas that are susceptible to mechanical damage and erosion. 10. PVC outer sheath: It mainly plays the role of protection, isolation and waterproof, and provides the outermost protection. Low-voltage cable: low-voltage 0.6KV copper core XLPE insulated PVC sheathed steel tape armored three-core 70 square cable (YJV22-0.6/1KV-3*70) The structure of the low-voltage cable is different from the conductor shielding layer and insulation shielding Layer and metal shielding layer, mainly due to different insulation capabilities, the low-voltage 0.4KV electric field capability is much weaker than 10KV, such as penetrating air or insulation penetration. Three, different usage methods. High-voltage cables must be made according to strict production processes before use, while low-voltage cables do not need to make cable heads. The laying requirements of high voltage cables and low voltage cables are also different. In short, the difference between high and low voltage cables comes from the difference in voltage and insulation capacity. These differences are all for the safety of electricity! Choose safe cables to ensure your own personal safety. Evcome cables are carefully selected, choose good raw materials, create high-quality home decoration wires, and give you and your family a safe guarantee. .
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