Medium-voltage variable-frequency power cable for oceanographic engineering and manufacturing method of medium-voltage variable-frequency power cable

Abstract

The invention discloses a medium-voltage variable-frequency power cable for oceanographic engineering. The cable comprises a cable body, and the cable body comprises a cable core, an inner sheath, anarmor layer and an outer sheath. An inner sheath, an armor layer and an outer sheath are sequentially sleeved and connected outside the cable core, and the cable core is formed by the twisting of three groups of insulated wire cores. Tinned circular compressed tinned copper conductors are arranged inside the insulated wire cores, and a conductor shielding layer, a crosslinked polyethylene insulating layer, an insulated shielding layer and a metal shielding layer are sequentially arranged on the outer layer of each copper conductor. The conductors adopt a 2-type wire compression tinned copper conductor structure. Because the filling coefficient reaches 97% or above, the molded line conductor structure has a small conductor outer diameter under the requirements of the same nominal cross section and direct current resistance, and the weights of the insulating layer and the outer sheath are reduced, thereby achieving the purposes of reducing the outer diameter of a cable finished product and reducing the overall weight of the cable. The split-phase shielding of the cable is changed into sparse winding of tin-plated copper wires and wrapping shielding of copper strips from traditional wrapping shielding of the copper strips, so that the shielding effect is improved.

Description

technical field [0001] The invention relates to a power cable, in particular to a medium-voltage variable-frequency power cable for marine engineering and a manufacturing method thereof, belonging to the application field of marine cables. Background technique [0002] With the increase of industrial electricity load, high-power frequency converters and frequency conversion motors are widely used, and more and more frequency conversion equipment are used in marine engineering. [0003] After retrieval, the Chinese patent application number 201120222467.2 discloses a hard ethylene propylene rubber insulated power cable for ships and marine engineering. The outer periphery of the conductor is coated with a hard ethylene-propylene rubber insulating layer to form an insulating core wire. The three insulating core wires are twisted to form a cable. The outer periphery of the cable is extruded with a low-smoke halogen-free inner lining. The outer periphery of the halogen-free inn...

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to provide a medium-voltage variable-frequency power cable for marine engineering and its manufacturing method, which can solve the problem of high-order harmonics and squares generated by the existing main circuit cable connecting the variable-frequency motor and the frequency converter in the process of transmitting electric energy. Waves will cause interference to the surrounding weak current systems. If ordinary marine engineering medium-voltage power cables are used, the leakage of high-order harmonics and square waves cannot be guaranteed, so it will still affect the surrounding weak current systems and affect its signal control and transmission technology. question

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