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Cables have many different models and specifications according to different classification standards. Yjv cable is one of the types, so what kind of cable is yjv? What are the yjv cable model specifications? Let's take a look with the editor below!
Cables We all know that cables are one of the necessary materials in power systems. Cables are usually considered to be made of one or more insulated conductors and an outer insulating protective layer to transmit power or information from one place to another. One wire. Cables have many different models and specifications according to different classification standards. Yjv cable is one of the types, so what kind of cable is yjv? What are the yjv cable model specifications? Let's take a look with the editor below!
1. What kind of cable is yjv?
First of all, I will introduce what yjv means, yj means cross-linked polyethylene, v means polychloride, then yjv is cross-linked polyethylene insulated PVC sheathed cable, and the scope of use is for the rated voltage (U0/U) 0.6 /1---26/35kv power line transmission and distribution, the maximum rated temperature of the cable conductor is 90°C when in use, and the maximum temperature of the cable conductor does not exceed 250°C when short-circuited (the longest duration does not exceed 5S) . Moreover, it has the advantages of light weight and simple structure, so it is widely used in urban power grids.
Two, yjv cable model specifications
The cores of the yjv cable mainly include single core, 2 cores, 3 cores, 4 cores, 5 cores, 3+1, 3+2, 4+1. 3+1 represents 3 phase wires+1 and ground wire, 3 +2 represents 3 phase wires +2 and ground wire, 4+1 represents 4 phase wires +1 and ground wire.
The standard model is the standard model. The specific size models include: 1 square, 1.5 square, 2.5 square, 4 square, 6 square, 10 square, 16 square, 25 square, 35 square, 50 square, 70 square, 95 square, 120 square, 150 Square, 185 square, 240 square, 300 square. For example, the yjv3*185+2*95 cable is a cable composed of 3 185 square phase wires and 2 95 ground wires. Since the combination of the phase wires and the ground wires of the cable is regulated by the standard, yjv3*185 The 95 square behind the +2*95 cable can be omitted.
The main specifications of the yjv cable range from 1 square to 240 square meters (can also be customized separately). It is a cable used to transmit and distribute electrical energy. It is most commonly used in urban underground power grids, lead-out lines of power stations, internal power supply of industrial and mining enterprises, and underwater transmission lines across rivers and seas. In power lines, the proportion of cables is gradually increasing. Power cable is a cable product used to transmit and distribute high-power electrical energy in the main line of the power system. It includes power cables with various voltage levels and insulations of 1-500KV and above.
Third, the structure of yjv cable
Yjv cables are classified into core, conductor insulation layer, filling layer, shielding layer, steel tape armor, and sheathing layer from the inside out.
Among them, yjv's core is mainly copper core, aluminum core is less used; the conductor insulation layer is polyvinyl chloride insulation; the filling layer is to fill the gap between the cores and protect the cores at the same time. The material is mostly soft nylon material; generally, power cables of 15KV and above generally have conductor shielding layer and insulating shielding layer; steel tape armor is a layer of steel protective layer covering the outer core of the wire to prevent the cable The effect of being squeezed and deformed, armored yjv cables are mostly used for underground burying; the sheath layer is the outermost layer of yjv cables, made of polyethylene, which plays the role of insulation and protection.
Four, yjv cable laying method
1. yjv, yjlv copper (aluminum) core cross-linked polyethylene is laid indoors, in channels and pipes, and can also be buried in loose, insulated PVC sheathed power cable soil, which cannot withstand external forces. 2. yjv22, yjlv22 copper (aluminum) core cross-linked polyethylene is laid underground, which can withstand external mechanical forces, but cannot withstand the large tensile force of vinyl insulated steel tape armored PVC sheathed power cables.
The above is the relevant knowledge of yjv cables introduced by the editor. yjv wires and cables are used to transmit electric (magnetic) energy, information and wire products that realize the conversion of electromagnetic energy. yjv cables are laid indoors, in channels and pipes. It can be buried in loose soil and cannot withstand external forces.
