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Method for manufacturing flexible joint of large-length submarine cable

A production method and technology of soft joints, applied in the direction of equipment for connecting/terminating cables, etc., can solve problems such as unsatisfactory performance and achieve excellent performance

Active Publication Date: 2012-07-18
HENGTONG SUBMARINE POWER CABLE CO LTD +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the performance of cables produced by such a splicing method cannot meet the requirements of high voltage, ultra-high voltage and submarine cables.

Method used

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  • Method for manufacturing flexible joint of large-length submarine cable
  • Method for manufacturing flexible joint of large-length submarine cable
  • Method for manufacturing flexible joint of large-length submarine cable

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Experimental program
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Embodiment Construction

[0026] Combine below Figure 1-4 The present invention is described in further detail.

[0027] 1) Conductor connection

[0028] The welding method of argon arc welding is used to weld the conductor 2 in staggered layers, and the welded part is treated to be equal to the outer diameter of the cable conductor.

[0029] 2) Conductor shielding and vulcanization

[0030] The conductor shielding layer 3 is prefabricated with special materials. The conductor shielding layer 3 adopts a half-sleeve structure, the inner diameter of the sleeve is close to the outer diameter of the conductor, and the length of the sleeve is guaranteed to overlap with the shielding of the cable conductor; The cover is wrapped with a layer of special material, which is easy to demould and fix the casing. When the vulcanization mold 7 is installed and heated to the predetermined temperature (240±5°C), cut off the power supply to stop heating, and gradually tighten the vulcanization mold fastening device,...

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Abstract

The invention discloses a method for manufacturing a flexible joint of a submarine cable capable of satisfying the requirements of high-voltage and ultrahigh-voltage use situations. The method comprises the steps as follows: 1) conductor connection; 2) conductor shield and vulcanization; 3) insulation extrusion; 4) insulation vulcanization; 5) insulation shield and repair; and 6) metal sheath recovery, wherein the insulation vulcanization process is that an insulated cable is put into a vulcanizing mould, nitrogen gas filled into the vulcanizing mould during the vulcanization cannot leak, cooling water systems at the two ends of the vulcanizing mould are simultaneously kept unblocked, so as to keep the temperature at the two ends of the cable below 70 DEG C; when the temperature reaches 235 to 245 DEG C and the nitrogen gas pressure is 1.5Mpa, insulation vulcanization begins, and the temperature and the pressure are regulated through a valve and a power source; and after the vulcanization is conducted for 120 minutes, the power source is cut off, the temperature is reduced below 100 DEG C while the pressure is kept at1.5Mpa, gas is discharged to release the pressure, and when the pressure is zero, the vulcanizing mould is opened and the cable is taken out. When the cable produced by adopting the manufacturing method disclosed by the invention is used as the submarine cable in high-voltage and ultrahigh-voltage situations, the performance of the cable is excellent and the requirements of the use environments are satisfied.

Description

technical field [0001] The invention relates to a manufacturing method of a submarine cable flexible joint, in particular to a manufacturing method of a flexible joint used for large-length high-voltage and ultra-high-voltage cross-linked polyethylene insulated AC submarine cables. Background technique [0002] Submarine cable is recognized by all countries in the world as a large-scale comprehensive project with the most difficulties and the highest degree of complexity. The design, manufacture, transportation, laying, and maintenance of cables are far higher than other cable products. At the same time, there are special requirements for cable length and cable life. However, the existing submarine cable production equipment and cable storage devices limit the maximum length. Production and use of AC submarine cables. Submarine cables are often damaged due to abnormal reasons such as anchor damage, which has brought huge economic losses to the user. [0003] The invention ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02G1/14
Inventor 冯华强许勇君张超周厚强王逢春陈锡才张磊
Owner HENGTONG SUBMARINE POWER CABLE CO LTD
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