LGJQT-1000/45 lightweight steel core aluminum stranded wire for overhead transmission and transformation bare wires

Description :

　　LGJQT-1000/45 lightweight steel core aluminum stranded wire for overhead transmission and transformation bare wires

　　Characteristics and uses of lightweight steel cored aluminum stranded wire:

　　 All specifications of lightweight steel cored aluminum stranded wire products can meet all the needs of various specifications of special conductors (secondary busbars) for substations, converter stations, and thermal power plants in China. This series of products has been successfully operated in multiple 220KV/500KV/750KV/1000KV substations and converter stations in China, achieving good operational performance. It is a core product in the construction, ongoing, and expansion of power transmission and transformation stations, thermal power plants, and other projects in China.

　　 Lightweight heat-resistant alloy wire (NAHLGJQ) and ultra lightweight steel cored aluminum stranded wire (LGJQT) are widely used in substation projects above 200KV-1000KV. The addition of alloy components to the wire improves the high-temperature performance of the product. The wire has a large cross-section, increased current carrying capacity, high heat resistance, high conductivity, low loss, reduces electrical energy loss, and increases the safety performance of equipment operation. The installation and maintenance procedures are the same as those for ordinary wire installation, without the need for any special tools. The tooling, installation, and maintenance are convenient, and the cost is low.

　　 A wire installation method adopted by ultra-high voltage transmission lines to suppress corona discharge and reduce line reactance. Each phase conductor is composed of several smaller diameter branch conductors, which are spaced at a certain distance and arranged in a symmetrical polygon. The number of split conductors in ultra-high voltage transmission lines is generally 3 to 4. Splitting wiresGenerally, each phase of the wire is composed of 2-4 smaller cross-sectional wires, with a distance of 0.3-0.5 meters between the sub wires, which can increase the diameter of the wire. Compared to larger wires with the same total cross-sectional area, it is less likely to produce corona and has higher power transmission capacity. Splitting wires are mainly used on lines with voltages of 330 kV and above. China's 330 kV transmission lines use double split conductors

　　 Unlike conventional wires, it is a splitted wire or wire harness made by manufacturing three or four single core wires together through a certain process. This type of split wire is not only different in form from conventional wires, but also increases the wire radius and reduces the wire reactance by changing the magnetic field distribution around the wire; At the same time, it also changes the electric field distribution around the wire, resulting in a corresponding increase in the wire's electronegativity. Compared with conventional wires, split wires have obvious advantages. Applying split wires to low-voltage distribution networks can reduce voltage drop, effectively improve the natural power factor of the line, and thus improve the performance of medium and low voltage power gridspower quality

　　 The current in a conductor has a characteristic called“Skin effect”(Also known as skin effect): Simply put, charges always concentrate on the surface of a conductor and flow, resulting in a higher current density on the surface of the conductor than at the center. The load current of high-voltage transmission lines is very high, and if only a single stranded wire is used, a large cross-sectional area is required to meet the current carrying capacity. Therefore, people invented the "split wire". In fact, it is to transmit single-phase current in parallel with multiple wires with smaller cross-sections, so that the large current can be evenly distributed on several wires, greatly reducing the required cross-sectional area. On the one hand, it reduces the manufacturing cost of the wires, and on the other hand, it improves the utilization rate of the conductors.

　　LGJQT-1000/45 lightweight steel core aluminum stranded wire for overhead transmission and transformation bare wires

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• aluminum conductor steel reinforced (ACSR)