A multi-cable assembly device for power transmission and its use method

Abstract

The invention discloses a power transmission multi-cable assembly device constituted by conductive joints and sheath pipes. Each of the sheath pipe is constituted by a pipe wall and a differentiation separation board, and the differentiation separation board is connected with the inner surface of the pipe wall, and can be used to divide the inner cavity of each of the sheath pipes into at least two wire passing cavities having the same areas of the cross sections. The conductive joints are parallely connected by connecting lugs, the number of which are equal to the number of the wire cavities, and are disposed on an insulation pedestal. Each of the connecting lugs is constituted by a connecting tongue and a socketed pipe, and the connecting tongue is additionally provided with at least one connecting screw hole, and the inner surface of each of the socketed pipes is uniformly provided with cone-shaped fastening teeth. The use method comprises four steps: determining of total wire diameter, differentiation of cables, assembly, and wiring. The use requirements of the large-cross section cables requiring various diameters can be flexibly and easily satisfied, and the production costs of the large-cross section cables can be reduced. The problem of the frequent occurrence of the skin effect of the large-cross section cables can be effectively solved, and therefore the use performance of the power cables can be greatly improved.

Description

technical field [0001] The invention relates to a multi-cable assembly device for power transmission and a method for using it, belonging to the technical field of power transmission. Background technique [0002] The diameter of the power cable directly affects the payload capacity that the power cable can bear. Generally speaking, the larger the diameter of the power cable, the greater the power load it can bear. In order to minimize the power in the Loss in the transmission process. At present, in the transmission of electric energy, the most commonly used method of electric energy transmission is the use of high-voltage AC transmission. When using this method to transmit electric energy, the electric energy carried by the power cable is in a periodical alternation according to a specific frequency. state, and when the alternating current passes through the conductor, the current will concentrate on the surface of the conductor, resulting in a skin effect, and this phenom...

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Problems solved by technology

[0002] The diameter of the power cable directly affects the payload capacity that the power cable can bear. Generally speaking, the larger the diameter of the power cable, the greater the power load it can bear. In order to minimize the power in the Loss in the transmission process. At present, in the transmission of electric energy, the most commonly used method of electric energy transmission is the use of high-voltage AC transmission. When using this method to transmit electric energy, the electric energy carried by the power cable is in a periodical alternation according to a specific frequency. state, and when the alternating current passes through the conductor, the current will concentrate on the surface of the conductor, resulting in a skin effect, and this phenomenon will become more serious as the frequency of the current or voltage changes when it passes through the conductor. At the same time, when the cross-sectional diameter of the power cable is larger, the skin effect is more obvious, resulting in a large amount of electric energy gathering on the surface of the conductor of the power cable on the surface of the total conductor, instead of being evenly distributed in the cross-sectional area of ​​the entire conductor as designed. Therefore, on the one hand, the power loss of the cable transmission line is increased, and the transmission capacity of the cable is reduced. On the other hand, it is easy to cause serious heating of the power cable, and even cause a fire. Therefore, in the current domestic and foreign cable conductor standards, the national standard (GB3956 ) The maximum copper core stranded conductor specified in ) is 2000 mm², and the maximum copper core stranded conductor specified in the international IEC standard (IEC60228) is 2500 mm²

[0003] With the sustained and rapid development of China's national economy and the continuous improvement of people's living standards, the demand for electricity in various industries is increasing, and the demand for electricity has increased sharply. Power facilities are developing in the direction of large-capacity (high voltage, high current) transmission. Therefore, it has become a consensus in the power industry to increase the transmission voltage level and increase the cross-sectional area of ​​the cable conductor of the transmission line. However, as the diameter of the power cable increases, the skin effect also increases. The power loss of the line reduces the transmission capacity of the cable. On the other hand, it is easy to cause serious heating of the power cable, and even cause a fire, which seriously affects the safety of power transmission and electricity use. In order to overcome this problem, the current common method is to use a The conductor of a large cross-section power cable is divided into several small cross-section conductors, and the insulation layer is installed between the small cross-section conductors. Although this method can effectively overcome the adverse effects brought by the skin effect, it also leads to large cross-section The production process of power cables is complicated and single, the production cost is too high and the production efficiency is low, so that the output of traditional large-section power cables cannot meet the needs of actual use. Due to the demand for the use of effective cable diameters in construction, it is necessary to develop a new type of flexible large-section power cable

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