Design method for conductor of special-shaped copper single-wire large-section submarine cable

Abstract

Disclosed is a method for designing a large-section submarine cable conductor based on a special-shaped copper single line. The method comprises the specific steps of: 1) calculating an outer diameter; 2) selecting a structure; 3) calculating an inclination angle of each special-shaped single line; 4) designing each special-shaped single line; 5) correcting a central angle corresponding to an extension line on two sides of the special-shaped single line; 6) calculating a filling coefficient of the special-shaped single line; 7) determining the sizes of the values of η and η'; and 8) obtaining a final design scheme. According to the design method, special-shaped copper single lines are used for designing a submarine cable conductor; the compressing coefficient design value of the conductor is 0.97; in combination with the influence of pitches on the arrangement of the special-shaped single lines; the water blocking effect of the conductor is improved; and the sectional area of each copper single line is kept consistent as much as possible, so that the skin effect and the proximity effect are reduced, and the conductor is suitable for transmitting an alternating current.

Description

technical field [0001] The invention belongs to the field of power cables, in particular to a design method for a special-shaped copper single-wire large-section submarine cable conductor. Background technique [0002] With the rapid development of island development strategies and offshore renewable energy power generation, offshore wind power generation is rapidly expanding, and the demand for submarine high-voltage power cables is increasing. [0003] DC transmission has the advantages of low line loss, easy asynchronous interconnection with the power grid, long-distance high-power transmission economy, etc., as well as the solution of voltage source converters and PWM technology that can be turned off devices, especially the construction of the international energy Internet is in-depth and flexible. DC transmission technology has received more and more attention. At present, 500kV DC submarine cables are being developed in China, and the conductor cross-section is requir...

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Problems solved by technology

[0003] DC transmission has the advantages of small line loss, easy asynchronous interconnection with the power grid, long-distance high-power transmission economy, etc., and the solution of voltage source converter and PWM technology that can turn off devices, especially the in-depth construction of the International Energy Internet, flexible DC transmission technology has received more and more attention. At present, 500kV DC submarine cables are being developed in China, and the conductor cross section is required to be 3000mm. 2 , but GB / T3956-2008 only specifies a nominal cross-sectional area of ​​0.5mm 2 to 2500mm 2 , for 3000mm 2 There is no specific requirement for cross-sectional conductors, some 3000mm 2 The cross-section conductor design patent only comprehensively considers the copper single-wire cross-section as small as possible to facilitate production and the difficulty of stranding process, but does not consider the pitch of copper single-wire stranding, resulting in 3000mm 2 The water blocking effect of the cross-section conductor is not ideal, and another 3000mm 2 Cross-sectional conductor resistance measurement is not yet mature

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