Production method for crosslinked polyethylene insulating power cable for ultra-high voltage aluminum core segmental conductor

Abstract

The invention provides a production method for a crosslinked polyethylene insulating power cable for an ultra-high voltage aluminum core segmental conductor, relating to a production method for a large-section crosslinked cable. In the invention, single lines are intertwisted together in a layered way, the crosslinked polyethylene insulating power cable is formed under the action of a special-shaped press roll, and five strand blocks which are pretwisted are respectively processed. Aiming to the condition of low aluminum wire elongation, and by putting time and energy in technical processing, the invention is changed from tightly pressing only one press roll in the layered way originally to respectively and tightly pressing equipment, and two special-shaped press rolls are added on the basis of the original equipment, thereby deformation of each single line for three times divided from compress deformation for one time is realized, the deformation rate of each single line for one time is reduced, the difficulty of the processing technology is greatly lowered, and the weakness of lower aluminum wire elongation is overcome.

Description

Technical field: [0001] The invention relates to a production method of a cross-linked cable with a large cross-section. Background technique: [0002] Large cross-section cross-linked cables are more and more widely used, and the conductor cross-section is greater than 800mm 2 The split conductor is used to reduce the skin effect of the cable, which has increased the current carrying capacity of the cable and reduced the loss of the cable line. Cross-linked cables are mainly made of copper core and aluminum core. The plastic deformation ability of copper metal is much better than that of aluminum. Therefore, copper split conductors have been widely used. Aluminum split conductors are very difficult to produce due to the difficulty in processing, so aluminum core split conductors The production technology of extra-high voltage XLPE insulated power cables is still blank. In terms of processing performance, the plasticity of aluminum is much worse than that of copper. For ex...

AI Technical Summary

Problems solved by technology

Cross-linked cables are mainly made of copper core and aluminum core. The plastic deformation ability of copper metal is much better than that of aluminum. Therefore, copper split conductors have been widely used. Aluminum split conductors are very difficult to produce due to the difficulty in processing, so aluminum core split conductors The production technology of ultra-high voltage XLPE insulated power cables is still blank

In terms of processing performance, the plasticity of aluminum is much worse than that of copper. For example, for a single wire with a diameter of Φ3.0, the elongation of the copper wire can reach more than 35%, while that of the aluminum wire is only about 10%. To make a split conductor, several single wires need to be pressed into shape. After the overall pre-twisting, it is equivalent to twisting a single wire twice (one of the five-split conductors), and then the five splits are cabled at the same time, and twisted once, which requires a high extension plasticity of the single wire to meet the requirements. This poses great difficulties to the aluminum single-line processing and manufacturing process.

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