What is the difference between high voltage and low voltage cables?

I. What is the difference between high-voltage cables and low-voltage cables?1. Different voltage levels. According to "GB/T2900.50-2008 electrician terminology power generation, transmission and distribution of general terminology", the voltage is less than 1KV (including 1KV) is defined as low voltage, 1KV-330KV is called high voltage. Therefore, the rated voltage is less than 1KV is called low voltage cable, the rated voltage is less than 1KV-330KV is called high voltage cable. 0.4KV and 10KV voltage level cables are very common in our work and life. 2, the structure is different. High-voltage cable:High-voltage 15KV copper core cross-linked polyethylene insulated PVC sheathed steel tape armored three-core 70-square cable(YJV22-8.7/15KV-3*70)(1). Stranded copper conductor:The conductor for transmitting electrical energy, made of multiple strands of hard wires stranded together. (2). Conductor Shield:Since the conductor is made of multiple strands of hard wires stranded together, there are gaps on the surface, which will lead to uneven electric field and easy to partial discharge. Therefore, conductive non-metallic soft materials are used to fill in to ensure a perfect fit with the insulating layer to make the electric field uniform and improve the life of the cable. (3). Insulation layer: since the electrical gap between the 10KV bare conductors is 125mm, the gap between the two conductors in the cable is very small, so it is necessary to use cross-linked PVC material with better performance to play a major insulating role. the thickness of the insulation layer for the 8.7/15KV model is generally not less than 4.5mm.(4). Insulation shielding layer: similarly, since there will be gaps in the direct combination of the insulation layer and the outer sheath, a conductive semiconductor layer is added outside the insulation layer to unify the electric field and to prevent partial discharges. (5). Metal shielding layer: in order to ensure that the semiconductor layer is reliably grounded, outsourced metal shielding layer, metal shielding layer directly grounded leakage cable and other conductors between the distributed capacitive current, while shielding part of the electromagnetic interference, to prevent other equipment interference. (6). Filler material: in order to eliminate the phenomenon of mutual inductance between three-phase cables, it is necessary to arrange the three-phase cables into a symmetrical zigzag, filler material to complete the internal residual space, to ensure the stability of the core and the mechanical strength of the cable. (7). Wrap around the tape: the material is mostly polyvinyl chloride, non-woven fabrics mainly to protect the cable isolated from external influences, packing wire core and filler round not loose. (8). Inner protective layer: the inner protective layer is a protective layer covering the cable insulation to prevent the insulation 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 cable and improve corrosion resistance and are designed for areas susceptible to mechanical damage and erosion. (10). PVC outer sheath:It mainly plays the role of protection, isolation and waterproofing, providing the outermost layer of protection. Low-voltage cable:Low-voltage 0.6KV copper core crosslinked polyethylene insulation polyvinyl chloride sheath steel tape armored three-core 70 square cable (YJV22-0.6/1KV-3*70), the structure of low-voltage cables is different from the conductor shielding, insulation shielding, and metal shielding, mainly due to the different insulation capacity, low-voltage 0.4KV electric field capacity is much weaker than 10KV, such as penetrating air or insulation Penetration. 3, different methods of use. High-voltage cables must be made in accordance with strict production processes before use, while low-voltage cables do not need to make cable heads. High-voltage cable and low-voltage cable laying requirements are also different.

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