CN117394223A - High-voltage submarine cable breakdown minimally invasive repair method - Google Patents
High-voltage submarine cable breakdown minimally invasive repair method Download PDFInfo
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- CN117394223A CN117394223A CN202311541700.7A CN202311541700A CN117394223A CN 117394223 A CN117394223 A CN 117394223A CN 202311541700 A CN202311541700 A CN 202311541700A CN 117394223 A CN117394223 A CN 117394223A
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- 230000008439 repair process Effects 0.000 title claims abstract description 247
- 230000015556 catabolic process Effects 0.000 title claims abstract description 48
- 238000000034 method Methods 0.000 title claims abstract description 40
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 34
- 239000010959 steel Substances 0.000 claims abstract description 34
- 238000002844 melting Methods 0.000 claims abstract description 27
- 230000008018 melting Effects 0.000 claims abstract description 27
- 239000007769 metal material Substances 0.000 claims abstract description 18
- 238000010438 heat treatment Methods 0.000 claims abstract description 17
- 239000002390 adhesive tape Substances 0.000 claims abstract description 16
- 238000005520 cutting process Methods 0.000 claims abstract description 14
- 239000000463 material Substances 0.000 claims abstract description 10
- 238000005516 engineering process Methods 0.000 claims abstract description 7
- 238000007493 shaping process Methods 0.000 claims abstract description 7
- 238000002347 injection Methods 0.000 claims description 29
- 239000007924 injection Substances 0.000 claims description 29
- 238000009413 insulation Methods 0.000 claims description 20
- 238000005553 drilling Methods 0.000 claims description 8
- 238000005498 polishing Methods 0.000 claims description 8
- 238000005452 bending Methods 0.000 claims description 6
- 238000009434 installation Methods 0.000 claims description 6
- 238000004140 cleaning Methods 0.000 claims description 5
- 238000011084 recovery Methods 0.000 claims description 5
- 239000011810 insulating material Substances 0.000 claims description 4
- 238000003466 welding Methods 0.000 claims description 4
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000003825 pressing Methods 0.000 abstract description 2
- 230000006872 improvement Effects 0.000 description 14
- 230000000694 effects Effects 0.000 description 8
- 230000007547 defect Effects 0.000 description 7
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- 238000010586 diagram Methods 0.000 description 6
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 4
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- 244000137852 Petrea volubilis Species 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
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- 241001391944 Commicarpus scandens Species 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02G—INSTALLATION OF ELECTRIC CABLES OR LINES, OR OF COMBINED OPTICAL AND ELECTRIC CABLES OR LINES
- H02G1/00—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines
- H02G1/16—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for repairing insulation or armouring of cables
Abstract
The invention discloses a high-voltage submarine cable breakdown minimally invasive repair method, which comprises the following steps: confirming the breakdown position of the submarine cable, and cutting off the armor layer; turning out the steel wires of the armor layer; stripping the outer sheath; stripping the lead sheath; forming a region to be repaired along the breakdown trace; performing repair area interface shaping along the area to be repaired; repairing the surface of the core wire; processing and installing the inner shielding repair layer, the insulating repair layer and the outer shielding repair layer; tightly pressing the interface of the repairing area by using a four-french belt, and binding the interface by using a metal material and a high-temperature adhesive tape; melting by infrared heating technology; disassembling the high-temperature adhesive tape, the metal material and the four-fured tape; restoring the lead sheath; restoring the outer sheath; restoring the armor layer. The invention provides a high-voltage submarine cable breakdown minimally invasive repair method for repairing a breakdown region of an insulating layer in a targeted manner, which shortens the repair period and reduces the material waste.
Description
Technical Field
The invention belongs to the field of submarine cable repair, and particularly relates to a high-voltage submarine cable breakdown minimally invasive repair method.
Background
The high-voltage submarine cable is often applied to a main road of power transportation, and along with the omnibearing coverage of a power grid in China, the manufacturing process of the submarine cable is continuously improved, but some microscopic defects are still unavoidable in the manufacturing, construction and operation processes of the submarine cable, electric branches are easy to induce at the microscopic defects, and the insulating layer of the submarine cable is broken down under the action of overvoltage.
After the breakdown of the insulating layer occurs, in order to ensure the safe use of the high-voltage submarine cable, the damaged insulating layer needs to be repaired in time and the core wire of the submarine cable is repaired, so that the problem that the insulator breakdown continues to occur in the subsequent use process is avoided. In the traditional repair process, the outer layers of the core wires in the circumferential range of the punctured area are completely stripped, then the core wires are repaired, and the outer layers of the core wires are wrapped and spliced, so that the repair work of the submarine cable is completed, but in the process, the undamaged submarine cable outer layer structure is stripped, so that great material waste is caused, the engineering quantity of the repair process is large, and the repair period is longer.
Disclosure of Invention
Aiming at the defects, the invention provides a high-voltage submarine cable breakdown minimally invasive repair method for performing targeted repair on a region where insulation layer breakdown occurs, shortening the repair period and reducing the material waste.
The technical scheme adopted by the invention for solving the problems is that the high-voltage submarine cable breakdown minimally invasive repair method comprises the following steps:
s1: confirming the breakdown position of the submarine cable, and cutting off the armor layer along the breakdown position by using a cutting machine;
s2: respectively turning out the steel wires of the armor layers at two sides of the breakdown position in a direction away from the breakdown position, and ensuring that the turning-out radius of the steel wires is larger than the bending elastic limit;
s3: stripping the outer sheath of the submarine cable, wherein the stripping length of the outer sheath is smaller than the turning-out length of the steel wire;
s4: stripping the lead sheath of the submarine cable, wherein the stripping length of the lead sheath is smaller than that of the outer sheath;
s5: cleaning damaged insulating materials at the breakdown position along the breakdown trace to form a region to be repaired;
s6: performing repair area interface shaping along the area to be repaired;
s7: repairing the surface of the core wire;
s8: processing the inner shielding repair layer, the insulating repair layer and the outer shielding repair layer according to the repair area interface;
s9: the inner shielding repair layer, the insulating repair layer and the outer shielding repair layer are sequentially installed from inside to outside;
s10: the outside of the interface of the repair area is sequentially pressed by a four-french belt, a metal material and a high-temperature adhesive tape from inside to outside for binding;
s11: melting the inner shielding repair layer and the original inner shielding layer by an infrared heating technology, melting the insulating repair layer and the original insulating layer, and melting the outer shielding repair layer and the original outer shielding layer;
s12: disassembling the high-temperature adhesive tape, the metal material and the four-fured tape;
s13: restoring the lead sheath;
s14: restoring the outer sheath;
s15: restoring the armor layer.
Compared with the prior art, the invention has the advantages that: through the steps of S1-S4, in the repairing process, the steel wires of the armor layer adopt a soft-closing turning-out method, so that the subsequent steel wires are convenient to recover and use, the waste of the steel wires is avoided, the stripping of the outer sheath and the lead sheath still adopts an integral stripping repairing mode, the uniformity of stress of the outer sheath and the lead sheath structure is ensured, and meanwhile, the abutting joint of the subsequent repairing materials is facilitated by reducing the stripping length layer by layer from outside to inside; then through the steps of S5 and S6, cleaning the breakdown area according to the breakdown trace, and shaping the repair area according to the structure of the breakdown area to obtain a repair area which is easy to operate and has higher repair quality; repairing the defects of the core wire through the step S7, and avoiding breakdown again; the inner shielding layer, the insulating layer and the outer shielding layer of the core wire are repaired through the steps of S8-S12, the inner shielding repairing layer, the insulating repairing layer and the outer shielding repairing layer are fixed by using four-french belts, the uniformity of heating of three layers of structures of the inner shielding repairing layer, the insulating repairing layer and the outer shielding repairing layer is guaranteed when infrared heating is carried out by using metal materials and high-temperature adhesive tapes, the quality after repair is guaranteed, the high-temperature adhesive tapes, the metal materials and the four-french belts can be removed after repair is finished, the structure of the high-voltage submarine cable is not influenced, the traceless repair of the inner shielding layer, the insulating layer and the outer shielding layer of the high-voltage submarine cable is realized, the structure is uniform, and the service quality of the submarine cable is not influenced by repairing traces caused by a minimally invasive repair method; and finally, repairing the lead sheath, the outer sheath and the armor layer, thereby completing the minimally invasive repair work of the breakdown area, accurately repairing the inner shielding layer, the insulating layer and the outer shielding layer without stripping in a large amount, further supplementing a large amount of repair materials, and greatly shortening the repair period.
As an improvement, in step S2, the steel wires of the armor layers on both sides are turned over by a length of 900mm or more, respectively, and by the improvement, a sufficient repair area is turned over, so that the interference of the steel wires in the repair process is avoided.
As an improvement, in step S3, the stripping length of the unilateral outer sheath is more than 150mm shorter than the turning-out length of the steel wire, and by the improvement, a bending space for turning out the steel wire is provided, so that the steel wire is ensured not to exceed the bending elastic limit in the turning-out process, and the subsequent recovery processing of the outer sheath is not influenced.
As an improvement, in step S4, the stripping length of the single-side lead sheath is 80mm or more shorter than the stripping length of the outer sheath, by which it is ensured that sufficient repair space for the lead sheath is provided, the overlapping distance of the lead sheath in the repair process is ensured, and the metallic shielding effect of the lead sheath is ensured.
In step S5, the hollow drill is used for drilling along the puncture trace towards the core wire, when the hollow drill is about to be propped against the core wire, the advancing rate of the hollow drill is reduced, the core wire is prevented from being damaged by the hollow drill when the original inner shielding layer, the original insulating layer and the original outer shielding layer are cut, through the improvement, the hollow drill is used for drilling, the inner side structure of the hollow drill can be integrally separated when drilling of one layer is completed by utilizing the multi-layer structure characteristic of a submarine cable, the puncture area can be completely separated, the method can be used for researching the subsequent submarine cable puncture phenomenon, the acting area of the hollow drill is far smaller than the acting area of a solid drill with the same diameter, the drilling efficiency is higher, the power required by drilling is smaller, the advancing rate of the hollow drill is reduced at the tail section of the drilling, the hollow drill is prevented from damaging the core wire, the core wire is prevented from being damaged by the hollow drill, burrs are prevented from being generated, the inner shielding layer can be prevented from being broken when drilling is about to be broken, and the suction cup or clamp is used for finally stripping the inner shielding layer.
As an improvement, in step S6, after the cut original inner shielding layer, original insulating layer and original outer shielding layer are taken out, the cylindrical groove formed by processing the hollow drill bit is flared into a conical groove through the ladder drill bit, and by the improvement, the structure of the conical groove is more beneficial to observing the repairing quality during repairing, thereby ensuring the repairing quality of each layer, avoiding the subsequent breakdown phenomenon, and if the cylindrical groove structure is ensured to be repaired, the repairing work of the insulating repairing layer is carried out under the condition that the inner shielding repairing layer is not aligned with the original inner shielding layer, thereby causing the phenomenon that the repaired inner shielding layer is poor in flatness and is extremely easy to break down again.
As an improvement, in step S8, the inner shielding repair layer, the insulating repair layer and the outer shielding repair layer are selected according to the adopted ladder-shaped drill bit structure, and the inner shielding repair layer, the insulating repair layer and the outer shielding repair layer can be produced in advance according to the ladder-shaped drill bit structure.
As an improvement, in step S9, when the inner shielding repair layer and the outer shielding repair layer are installed, secondary polishing is performed according to the installation allowance, so as to ensure the connection flatness of the inner shielding repair layer and the original inner shielding layer and the outer shielding repair layer and the original outer shielding layer, by the improvement, after the repair is completed, the connection flatness of the inner shielding repair layer and the original inner shielding layer and the connection flatness of the outer shielding repair layer and the original outer shielding layer are required to be ensured, and the problem of breakdown in the area can be avoided again with high probability, but because the inner shielding repair layer needs to be pressed and shaped along the core wire during repair installation, the outer shielding repair layer needs to be pressed and shaped along the insulation repair layer during repair installation, especially the connection surface structure of the inner shielding repair layer is more complex, one side close to the core wire is a cambered surface close to a plane, one side close to the insulation repair layer is a large cambered surface, the pressing and shaping is poor, and secondary polishing is required to be performed for allowance correction.
As an improvement, in step S9, the insulating repair layer is formed by using an injection mold, an injection mold cavity is arranged in the injection mold, the side surface of the injection mold cavity is identical to the side surface structure of the ladder-shaped drill bit, the lower end surface of the injection mold cavity is identical to the outer side surface of the original inner shielding layer, the upper end surface of the injection mold cavity is identical to the inner side surface of the original outer shielding layer, in step S11, an insulating preheating block with the same structure as the insulating repair layer is reformed by using the injection mold, an outer shielding preheating block with the same structure as the outer shielding repair layer is produced in advance, and the surfaces of the insulating preheating block and the outer shielding preheating block are polished for a plurality of times to be smooth; when the inner shielding repair layer and the original inner shielding layer are melted, the outer side of the inner shielding repair layer is filled by using an insulating preheating block and an outer shielding preheating block; when the insulation repair layer and the original insulation layer are melted, the outer side of the insulation repair layer is filled by using an outer shielding preheating block, and by the improvement, the insulation repair layer with high precision can be manufactured by using an injection mold, so that the insulation repair layer can be ensured to be repaired with high quality, and can be used as a repair quality detection tool for the inner shielding repair layer; in step S11, the melting temperatures of the inner shielding repair layer, the insulating repair layer and the outer shielding repair layer are different, if the three are used for repairing in a synchronous melting manner, a higher temperature is required for repairing the inner shielding repair layer, and the temperature can cause damage to the outer shielding repair layer due to overhigh temperature, so that the three-layer structure is the best scheme that the three-layer structure adopts layered melting, in the repairing process of the inner shielding repair layer, the insulating preheating block and the outer shielding preheating block are adopted for filling, the repairing flatness of the inner shielding repair layer can be judged, the compacting effect of the inner shielding repair layer can be ensured, the repairing quality of the inner shielding repair layer can be ensured, meanwhile, in the melting process of the inner shielding repair layer, the insulating preheating block and the outer shielding preheating block can also be heated, the repairing surfaces of the original insulating layer and the original outer shielding layer can be preheated, the material activity of the original insulating layer and the original outer shielding layer can be activated, the repairing work efficiency of the subsequent original insulating layer and the original outer shielding layer can be improved on the premise of ensuring high repairing quality, and the repairing work efficiency of the inner shielding repair layer can be realized, and the inner shielding repair layer can be repeatedly carried out through four times of metal preheating tape and high-temperature.
In step S13, the lead sheath for repair is overlapped with the original lead sheath by more than 40mm, and welding recovery is carried out; in step S14, the repair outer sheath is formed by wrapping the lead sheath with a tape of the same material as the original outer sheath, and then heating and melting the lead sheath; in step S15, the turned-out raw steel wires are reset and woven, when the cut section is reset and woven, the repair steel wires are interlaced and woven into the raw steel wires, the raw steel wires at two ends of the cut section are connected, and welded and fixed, through the improvement, the integral metal shielding of the lead sheath, the high-strength connection of the outer sheath and the armor layer and the integral repair work are realized, and the three layers mainly have the effects of isolating the submarine cable from the external environment, and more importantly, the sealing performance and the structural strength.
Drawings
FIG. 1 is a schematic diagram of the structure of the submarine cable after the steps S1-S4.
Fig. 2 is a schematic diagram of the cross-sectional structure of the submarine cable after the step S5.
FIG. 3 is a schematic diagram of the cross-sectional structure of the submarine cable after the step S6.
Fig. 4 is a schematic diagram of the cross-sectional structure of the submarine cable after the step S6.
FIG. 5 is a schematic diagram of the cross-sectional structure of the submarine cable after the completion of step S12.
FIG. 6 is a schematic diagram of the cross-sectional structure of the submarine cable after the completion of step S12.
The figure shows: 1. armor, 1.1, steel wire, 2, outer sheath, 3, lead sheath, 4, former outer shielding layer, 5, former insulating layer, 6, former inner shielding layer, 7, heart yearn, 8, hollow drill bit, 9, ladder-shaped drill bit, 10, cylindrical groove, 11, conical groove, 12, outer shielding repair layer, 13, insulating repair layer, 14, inner shielding repair layer.
Detailed Description
Embodiments of the present invention are further described below with reference to the accompanying drawings.
Example application 1:
as shown in fig. 1-6, a high-voltage submarine cable breakdown minimally invasive repair method comprises the following steps:
s1: confirming the breakdown position of the submarine cable, and cutting off the armor layer 1 along the breakdown position by using a cutting machine;
s2: the steel wires 1.1 of the armor layers 1 at the two sides of the breakdown position are respectively turned out in the direction away from the breakdown position, the turning-out radius of the steel wires 1.1 is ensured to be larger than the bending elastic limit, and the steel wires 1.1 of the armor layers 1 at the two sides are respectively turned out to be 1000mm in length;
s3: the outer sheath 2 of the submarine cable is stripped, the stripping length of the outer sheath 2 is smaller than the turning-out length of the steel wire 1.1, and the length of the break-through point is 800mm from the center to the two sides;
s4: the lead sheath 3 of the submarine cable is stripped, the stripping length of the lead sheath 3 is smaller than that of the outer sheath 2, and the stripping length of the lead sheath 3 is 700mm from the center to the two sides;
s5: cleaning damaged insulating materials at the breakdown position along the breakdown trace to form a region to be repaired;
s6: performing repair area interface shaping along the area to be repaired;
s7: repairing the surface of the core wire 7;
s8: processing the inner shielding repair layer 14, the insulating repair layer 13 and the outer shielding repair layer 12 according to the repair area interface;
s9: the inner shielding repair layer 14, the insulating repair layer 13 and the outer shielding repair layer 12 are sequentially arranged from inside to outside;
s10: the outside of the interface of the repair area is sequentially pressed by a four-french belt, a metal material and a high-temperature adhesive tape from inside to outside for binding;
s11: melting the inner shielding repair layer 14 and the original inner shielding layer 6 by an infrared heating technology, melting the insulating repair layer 13 and the original insulating layer 5, and melting the outer shielding repair layer 12 and the original outer shielding layer 4;
s12: disassembling the high-temperature adhesive tape, the metal material and the four-fured tape;
s13: restoring the lead sheath 3;
s14: restoring the outer sheath 2;
s15: restoring the armor layer 1.
In step S5, the hollow drill 8 is used to drill a hole along the puncture trace toward the core wire 7, when the hollow drill 8 is about to be abutted against the core wire 7, the advancing speed of the hollow drill 8 is reduced, the core wire 7 is prevented from being damaged by the hollow drill 8 while the cutting of the original inner shielding layer 6, the original insulating layer 5 and the original outer shielding layer 4 is completed, in step S6, the cut original inner shielding layer 6, the original insulating layer 5 and the original outer shielding layer 4 are taken out, the cylindrical groove 10 processed by the hollow drill 8 is flared into a conical groove 11 through the ladder drill 9, the interface of the repair area is shaped through the conical groove 11, the cut surfaces of the original inner shielding layer 6, the original insulating layer 5 and the original outer shielding layer 4 are ground into smooth inclined surfaces through sand paper, and no step phenomenon can be caused, otherwise, the repair melting effect can be affected.
Meanwhile, the original inner shielding layer 6 which is not broken can be stripped and polished, so that the smoothness of the cut surface of the inner shielding layer after cutting is guaranteed, the core wire 7 can be exposed, the step of S7 is convenient to carry out, the surface of the core wire 7 is repaired, and as shown in fig. 4 and 6, the structure of the original inner shielding layer 6 is different, namely the inner shielding layer in the repair area is polished and changed after stripping.
In step S6, the cut original inner shield layer 6, original insulating layer 5, and original outer shield layer 4 are taken out, and then the cylindrical groove 10 formed by the hollow drill 8 is flared into a conical groove 11 by the ladder drill 9.
In step S8, the inner shielding repair layer 14, the insulating repair layer 13 and the outer shielding repair layer 12 are selected according to the adopted ladder-shaped drill bit 9 structure, the inner shielding repair layer 14, the insulating repair layer 13 and the outer shielding repair layer 12 can be produced in advance according to the ladder-shaped drill bit 9 structure, in step S9, when the inner shielding repair layer 14 and the outer shielding repair layer 12 are installed, secondary polishing processing is performed according to installation allowance, so that the connection flatness of the inner shielding repair layer 14 and the original inner shielding layer 6 and the connection flatness of the outer shielding repair layer 12 and the original outer shielding layer 4 are ensured, the insulating repair layer 13 is formed by adopting an injection mold, an injection mold cavity is arranged in the injection mold, the side surface of the injection mold cavity is identical to the side surface structure of the ladder-shaped drill bit, the lower end surface of the injection mold cavity is identical to the outer side surface of the original inner shielding layer 6, and the upper end surface of the injection mold cavity is identical to the inner side surface of the original outer shielding layer 4.
In step S13, the lead sheath 3 for repair is overlapped with the original lead sheath 3 by more than 40mm, and welding recovery is performed;
in step S14, the repair outer sheath 2 is obtained by wrapping the lead sheath 3 with a tape made of the same material as the original outer sheath 2, and then heating and melting the lead sheath;
in step S15, the turned-out raw wire 1.1 is reset-knitted, and when the cut section is reset-knitted, the wire 1.1 for repair is interlaced-knitted into the raw wire 1.1, and the raw wires 1.1 at both ends of the cut section are connected and welded.
In step S10, the metal material is a heating coil formed by coiling copper wires.
Example 2:
a high-voltage submarine cable breakdown minimally invasive repair method comprises the following steps:
s1: confirming the breakdown position of the submarine cable, and cutting off the armor layer 1 along the breakdown position by using a cutting machine;
s2: the steel wires 1.1 of the armor layers 1 at the two sides of the breakdown position are respectively turned out in the direction away from the breakdown position, the turning-out radius of the steel wires 1.1 is ensured to be larger than the bending elastic limit, and the steel wires 1.1 of the armor layers 1 at the two sides are respectively turned out to be 1000mm in length;
s3: the outer sheath 2 of the submarine cable is stripped, the stripping length of the outer sheath 2 is smaller than the turning-out length of the steel wire 1.1, and the length of the break-through point is 800mm from the center to the two sides;
s4: the lead sheath 3 of the submarine cable is stripped, the stripping length of the lead sheath 3 is smaller than that of the outer sheath 2, and the stripping length of the lead sheath 3 is 700mm from the center to the two sides;
s5: cleaning damaged insulating materials at the breakdown position along the breakdown trace to form a region to be repaired;
s6: performing repair area interface shaping along the area to be repaired;
s7: repairing the surface of the core wire 7;
s8: processing the inner shielding repair layer 14, the insulating repair layer 13, the outer shielding repair layer 12, the insulating preheating block and the outer shielding preheating block according to the repair area interface;
s9-1: the inner shielding repair layer 14, the insulating preheating block 3 and the outer shielding preheating block are sequentially arranged from inside to outside;
s10-1: the outside of the interface of the repair area is sequentially pressed by a four-french belt, a metal material and a high-temperature adhesive tape from inside to outside for binding;
s11-1: melting the inner shielding repair layer 14 and the original inner shielding layer 6 by an infrared heating technology;
s12-1: detaching the high-temperature adhesive tape, the metal material and the four-fured tape, observing the repair quality of the inner shielding repair layer 14, and timely polishing and repairing if a repair defect exists;
s9-2: the insulation repair layer 13 and the outer shielding preheating block are installed sequentially from inside to outside;
s10-2: the outside of the interface of the repair area is sequentially pressed by a four-french belt, a metal material and a high-temperature adhesive tape from inside to outside for binding;
s11-2: melting the insulation repair layer 13 and the original insulation layer 5 by an infrared heating technology;
s12-2: disassembling the high-temperature adhesive tape, the metal material and the four-fured tape, observing the repair quality of the insulating repair layer 13, and timely polishing and repairing if repair defects exist;
s9-3: the outer shielding repair layer 12 is installed sequentially from inside to outside;
s10-3: the outside of the interface of the repair area is sequentially pressed by a four-french belt, a metal material and a high-temperature adhesive tape from inside to outside for binding;
s11-3: melting the outer shielding repair layer 12 and the original outer shielding layer 4 by an infrared heating technology;
s12-3: disassembling the high-temperature adhesive tape, the metal material and the four-fured tape, observing the repair quality of the outer shielding repair layer 12, and timely polishing and repairing if a repair defect exists;
s13: restoring the lead sheath 3;
s14: restoring the outer sheath 2;
s15: restoring the armor layer 1.
In step S5, the hollow drill 8 is used to drill a hole along the puncture trace toward the core wire 7, when the hollow drill 8 is about to be abutted against the core wire 7, the advancing speed of the hollow drill 8 is reduced, the core wire 7 is prevented from being damaged by the hollow drill 8 while the cutting of the original inner shielding layer 6, the original insulating layer 5 and the original outer shielding layer 4 is completed, in step S6, the cut original inner shielding layer 6, the original insulating layer 5 and the original outer shielding layer 4 are taken out, the cylindrical groove 10 processed by the hollow drill 8 is flared into a conical groove 11 through the ladder drill 9, the interface of the repair area is shaped through the conical groove 11, the cut surfaces of the original inner shielding layer 6, the original insulating layer 5 and the original outer shielding layer 4 are ground into smooth inclined surfaces through sand paper, and no step phenomenon can be caused, otherwise, the repair melting effect can be affected.
Meanwhile, the original inner shielding layer 6 which is not broken can be stripped and polished, so that the smoothness of the cut surface of the inner shielding layer after cutting is guaranteed, the core wire 7 can be exposed, the step of S7 is convenient to carry out, the surface of the core wire 7 is repaired, and as shown in fig. 4 and 6, the structure of the original inner shielding layer 6 is different, namely the inner shielding layer in the repair area is polished and changed after stripping.
In step S6, the cut original inner shield layer 6, original insulating layer 5, and original outer shield layer 4 are taken out, and then the cylindrical groove 10 formed by the hollow drill 8 is flared into a conical groove 11 by the ladder drill 9.
In step S8, the inner shielding repair layer 14, the insulating repair layer 13 and the outer shielding repair layer 12 are selected according to the adopted ladder-type drill bit 9 structure, the inner shielding repair layer 14, the insulating repair layer 13 and the outer shielding repair layer 12 can be produced in advance according to the ladder-type drill bit 9 structure, and in step S9, when the inner shielding repair layer 14 and the outer shielding repair layer 12 are installed, secondary polishing processing is performed according to the installation allowance, so that the connection flatness of the inner shielding repair layer 14 and the original inner shielding layer 6 and the connection flatness of the outer shielding repair layer 12 and the original outer shielding layer 4 are ensured.
The insulation repair layer 13 is formed by adopting an injection mold, an injection mold cavity is arranged in the injection mold, the side surface of the injection mold cavity is identical to the side surface structure of the ladder-shaped drill bit, the lower end surface of the injection mold cavity is identical to the outer side surface of the original inner shielding layer 6, and the upper end surface of the injection mold cavity is identical to the inner side surface of the original outer shielding layer 4; in step S11, an insulating preheating block with the same structure as the insulating repair layer 13 is reformed by using an injection mold, an outer shielding preheating block with the same structure as the outer shielding repair layer 12 is pre-produced, and the surfaces of the insulating preheating block and the outer shielding preheating block are polished for a plurality of times to be smooth; when the inner shielding repair layer 14 and the original inner shielding layer 6 are melted, the outer side of the inner shielding repair layer 14 is filled by using an insulating preheating block and an outer shielding preheating block; when the insulating repair layer 13 and the original insulating layer 5 are melted, the outer side of the insulating repair layer 13 is filled by using an outer shielding preheating block, in the step S11, the melting temperatures of the inner shielding repair layer 14, the insulating repair layer 13 and the outer shielding repair layer 12 are different, if the inner shielding repair layer 14 and the outer shielding repair layer 12 are repaired in a synchronous melting mode, a higher temperature is required, the temperature can cause the damage of overhigh temperature to the outer shielding repair layer 12, so that the optimal scheme of the three-layer structure is that the insulating repair layer 14 is melted in a layering manner, the insulating preheating block and the outer shielding preheating block are used for filling in the repair process of the inner shielding repair layer 14, the smoothness of the repair of the inner shielding repair layer 14 can be judged, the compacting effect of the inner shielding repair layer 14 can be ensured, meanwhile, the insulating preheating block and the outer shielding preheating block can also heat up in the process of the inner shielding repair layer 14, the repair surfaces of the original insulating layer 5 and the original outer shielding repair layer 4, the insulating repair layer 5 and the original shielding repair layer 4 can be preheated, the repair efficiency can be improved, and the repair tape can be guaranteed, and the repair efficiency can be improved when the original shielding repair layer 4 is required to be repeatedly carried out, and the repair is carried out, and the insulation tape is required to be repaired, and the repair is filled, and the repair layer is required to be repeatedly, and the insulation layer is repaired, and the insulation tape is required to be repaired.
The insulating preheating block and the outer shielding preheating block are formed by aluminum metal, the melting point of the aluminum metal is 660 ℃, the aluminum metal can be formed by using an injection mold which is the same as that of the insulating repairing layer, and the aluminum metal does not generate a melting phenomenon in the subsequent infrared heating process, meanwhile, has good heat conductivity, can quickly achieve a heat conduction effect in infrared heating, so that the inner shielding repairing layer 14 and the original inner shielding layer 6 are quickly melted, the original insulating layer 5 is quickly activated, and the subsequent melting repairing work of the insulating repairing layer 13 and the original insulating layer 5 is facilitated.
In step S13, the lead sheath 3 for repair is overlapped with the original lead sheath 3 by more than 40mm, and welding recovery is performed;
in step S14, the repair outer sheath 2 is obtained by wrapping the lead sheath 3 with a tape made of the same material as the original outer sheath 2, and then heating and melting the lead sheath;
in step S15, the turned-out raw wire 1.1 is reset-knitted, and when the cut section is reset-knitted, the wire 1.1 for repair is interlaced-knitted into the raw wire 1.1, and the raw wires 1.1 at both ends of the cut section are connected and welded.
In step S10, the metal material is a heating coil formed by coiling copper wires.
Compared with the traditional repair method, the minimally invasive repair method has the advantages of low repair cost, short repair period, more suitability for outdoor repair, lower requirement on outdoor repair equipment, correspondingly higher repair requirement, higher requirement on the detail alignment of the inner shielding repair layer 14 and the original inner shielding layer 6, the insulation repair layer 13 and the original insulation layer 5, and the outer shielding repair layer 12 and the original outer shielding layer 4, but better alignment of the three can be calibrated through the interface design of the conical groove 11, and repair quality can be ensured.
The foregoing is illustrative of the preferred embodiments of the present invention and is not to be construed as limiting the claims. The present invention is not limited to the above embodiments, and the specific structure thereof is allowed to vary. All changes which come within the meaning and range of equivalency of the claims are to be embraced within their scope.
Claims (10)
1. The high-voltage submarine cable breakdown minimally invasive repair method is characterized by comprising the following steps of:
s1: confirming a sea cable breakdown position, and cutting off the armor layer (1) along the breakdown position by using a cutting machine;
s2: the steel wires (1.1) of the armor layers (1) at the two sides of the breakdown position are respectively turned out in the direction away from the breakdown position, and the turning-out radius of the steel wires (1.1) is ensured to be larger than the bending elastic limit;
s3: an outer sheath (2) of the submarine cable is stripped, and the stripping length of the outer sheath (2) is smaller than the turning-out length of the steel wire (1.1);
s4: a lead sheath (3) of the submarine cable is stripped, and the stripping length of the lead sheath (3) is smaller than that of the outer sheath (2);
s5: cleaning damaged insulating materials at the breakdown position along the breakdown trace to form a region to be repaired;
s6: performing repair area interface shaping along the area to be repaired;
s7: repairing the surface of the core wire (7);
s8: processing the inner shielding repair layer (14), the insulating repair layer (13) and the outer shielding repair layer (12) according to the repair area interface;
s9: the inner shielding repair layer (14), the insulation repair layer (13) and the outer shielding repair layer (12) are sequentially arranged from inside to outside;
s10: the outside of the interface of the repair area is sequentially pressed by a four-french belt, a metal material and a high-temperature adhesive tape from inside to outside for binding;
s11: melting an inner shielding repair layer (14) and an original inner shielding layer (6) through an infrared heating technology, melting an insulating repair layer (13) and an original insulating layer (5), and melting an outer shielding repair layer (12) and an original outer shielding layer (4);
s12: disassembling the high-temperature adhesive tape, the metal material and the four-fured tape;
s13: restoring the lead sheath (3);
s14: restoring the outer sheath (2);
s15: restoring the armor layer (1).
2. The high-voltage submarine cable puncture minimally invasive repair method according to claim 1, wherein the method comprises the following steps of: in the step S2, the steel wires (1.1) of the armor layers (1) on both sides are turned over to a length of 900mm or more.
3. The high-voltage submarine cable puncture minimally invasive repair method according to claim 1, wherein the method comprises the following steps of: in step S3, the stripping length of the single-side outer sheath (2) is 150mm or more shorter than the turning-out length of the steel wire (1.1).
4. The high-voltage submarine cable puncture minimally invasive repair method according to claim 1, wherein the method comprises the following steps of: in step S4, the peeling length of the single-sided lead sheath (3) is 80mm or more shorter than the peeling length of the outer sheath (2).
5. The high-voltage submarine cable puncture minimally invasive repair method according to claim 1, wherein the method comprises the following steps of: in step S5, a hollow drill bit (8) is used for drilling holes along the breakdown trace towards the core wire (7), when the hollow drill bit (8) is about to be propped against the core wire (7), the advancing speed of the hollow drill bit (8) is reduced, and the core wire (7) is prevented from being damaged by the hollow drill bit (8) while the cutting of the original inner shielding layer (6), the original insulating layer (5) and the original outer shielding layer (4) is completed.
6. The high-voltage submarine cable puncture minimally invasive repair method according to claim 5, wherein the method comprises the following steps of: in step S6, the cut original inner shielding layer (6), original insulating layer (5) and original outer shielding layer (4) are taken out, and then the cylindrical groove (10) processed by the hollow drill bit (8) is flared into a conical groove (11) through the ladder-shaped drill bit (9).
7. The high-voltage submarine cable puncture minimally invasive repair method according to claim 6, wherein the method comprises the following steps of: in step S8, the inner shielding repair layer (14), the insulation repair layer (13) and the outer shielding repair layer (12) are selected according to the adopted ladder-type drill bit (9), and the inner shielding repair layer (14), the insulation repair layer (13) and the outer shielding repair layer (12) can be pre-produced according to the structure of the ladder-type drill bit (9).
8. The high-voltage submarine cable puncture minimally invasive repair method according to claim 7, wherein the method comprises the following steps of: in step S9, when the inner shielding repair layer (14) and the outer shielding repair layer (12) are installed, secondary polishing processing is performed according to the installation allowance, so as to ensure the connection flatness of the inner shielding repair layer (14) and the original inner shielding layer (6) and the connection flatness of the outer shielding repair layer (12) and the original outer shielding layer (4).
9. The high-voltage submarine cable puncture minimally invasive repair method according to claim 7, wherein the method comprises the following steps of:
in the step S9, the insulating repair layer (13) is formed by adopting an injection mold, an injection mold cavity is arranged in the injection mold, the side surface of the injection mold cavity is identical to the side surface structure of the ladder-shaped drill bit (9), the lower end surface of the injection mold cavity is identical to the outer side surface of the original inner shielding layer (6), and the upper end surface of the injection mold cavity is identical to the inner side surface of the original outer shielding layer (4);
in the step S11, an insulating preheating block with the same structure as the insulating repair layer (13) and an outer shielding preheating block with the same structure as the outer shielding repair layer (12) are preformed by using an injection mold, and the surfaces of the insulating preheating block and the outer shielding preheating block are polished for a plurality of times to be smooth; when the inner shielding repair layer (14) and the original inner shielding layer (6) are melted, the outer side of the inner shielding repair layer (14) is filled by using an insulating preheating block and an outer shielding preheating block; when the insulating repair layer (13) and the original insulating layer (5) are melted, the outer side of the insulating repair layer (13) is filled with an outer shielding preheating block.
10. The high-voltage submarine cable puncture minimally invasive repair method according to claim 1, wherein the method comprises the following steps of:
in the step S13, the lead sheath (3) for repairing is overlapped with the original lead sheath (3) by more than 40mm, and welding recovery is carried out;
in step S14, the repair outer sheath (2) is formed by wrapping the lead sheath (3) with a tape made of the same material as the original outer sheath (2), and then heating and melting the lead sheath;
in step S15, the turned-out raw steel wire (1.1) is reset-knitted, and when the reset-knitted wire is reset-knitted into the cut section, the repairing steel wire (1.1) is interlaced-knitted into the raw steel wire (1.1), and the raw steel wires (1.1) at both ends of the cut wire are connected and welded and fixed.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202311541700.7A CN117394223A (en) | 2023-11-16 | 2023-11-16 | High-voltage submarine cable breakdown minimally invasive repair method |
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| CN202311541700.7A CN117394223A (en) | 2023-11-16 | 2023-11-16 | High-voltage submarine cable breakdown minimally invasive repair method |
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| CN202311541700.7A Pending CN117394223A (en) | 2023-11-16 | 2023-11-16 | High-voltage submarine cable breakdown minimally invasive repair method |
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| CN (1) | CN117394223A (en) |
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