CN113690808B - Outer sheath breaking and repairing method used in repair of high-voltage cable buffer layer - Google Patents
Outer sheath breaking and repairing method used in repair of high-voltage cable buffer layer Download PDFInfo
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- CN113690808B CN113690808B CN202111237379.4A CN202111237379A CN113690808B CN 113690808 B CN113690808 B CN 113690808B CN 202111237379 A CN202111237379 A CN 202111237379A CN 113690808 B CN113690808 B CN 113690808B
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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
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Abstract
The invention relates to a method for breaking and repairing an outer sheath when a high-voltage cable buffer layer is repaired, which is characterized in that a sheath withstand voltage test is carried out on a cable to be repaired before repair; preparing a solder for filling in advance, breaking the outer sheath of the cable, and chamfering the cut outer sheath and the cut at 45 degrees; the buffer layer of the cut outer sheath is repaired, the cut outer sheath is butted at the cut after the repair, the welding flux for filling is used for welding, finally, the insulating self-adhesive tape, the waterproof tape and the PVC adhesive tape are used for processing, and the cable outer sheath can be used after the sheath withstand voltage test is carried out again. The high-voltage cable outer sheath has small breaking size, excellent sealing performance and simple and convenient recovery process, and effectively ensures the sealing performance and the electrical performance of the cable outer sheath. The safe and reliable operation of the cable is ensured.
Description
Technical Field
The invention belongs to the technical field of cable repair, and particularly relates to a method for breaking and repairing an outer sheath when a buffer layer of a high-voltage cable is repaired.
Background
The role of the high-voltage cable in the urban power grid is more and more important, and along with the continuous improvement of the urban cabling rate, the running safety of the high-voltage cable determines the electricity utilization problem of thousands of households. At present, the failure rate of the 110 (66) kV high-voltage cable body in China only accounts for 0.81 percent of the total failure rate of a cable line, but a large number of body failures belong to ablation failures in a buffer layer.
In order to repair a buffer layer in a corrugated aluminum sheath of a high-voltage cable, a corrugated aluminum sheath is required to be broken to inject a medium into a buffer layer gap between the corrugated aluminum sheath and an outer shielding layer of the cable, the existing method is to integrally break the corrugated aluminum sheath for a circle at the position where the corrugated aluminum sheath needs to be broken, the breaking area is large, a plurality of accessories which need to be matched to ensure the sealing performance are provided, and the probability of leakage points which are not sealed tightly is high. And the technical level requirement of the process for recovering the corrugated aluminum sheath of the cable after the buffer layer is repaired is high.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, provides a method for breaking and repairing an outer sheath when a high-voltage cable buffer layer is matched for repair, can recover the original sealing performance of the cable outer sheath, is simple and convenient to recover, and has low requirements on technical personnel.
The technical problem to be solved by the invention is realized by adopting the following technical scheme:
a method for breaking and repairing an outer sheath in cooperation with repair of a buffer layer of a high-voltage cable comprises the following steps:
step 2.1, removing the graphite layer or the semi-conducting layer within a certain range at two sides of the pre-opening hole;
step 2.2, circularly cutting the outer sheath at two sides of the pre-opening position at a certain distance, and chamfering the cutting position for 45 degrees;
step 2.3, stripping the outer sheath at the circular cutting position in the step 2.2 and reserving the outer sheath for later use to obtain a buffer layer for breaking the aluminum sheath;
step 2.4, repairing the buffer layer obtained in the step 2.3;
and 3, recovering the sealing performance of the cable outer sheath.
Moreover, the specific implementation method of the step 2.1 is as follows: preparing an outer sheath made of the same material as the outer sheath of the cable to be repaired, removing internal asphalt, a graphite layer or an outer semi-conducting layer, and preparing a filling solder; removing the pre-perforated holes or breaking the graphite layer or the semi-conducting layer in a certain range on both sides of the corrugated aluminum sheath of the cable.
Moreover, the specific implementation method of the step 2.2 is as follows: and performing outer sheath circular cutting at a certain distance from the two sides of the pre-opening hole or the position where the corrugated aluminum sheath of the cable is broken, and cutting through the outer sheaths at the two circular cutting positions along the direction of the fiber core of the cable.
Moreover, the specific implementation method of the step 2.3 is as follows: removing the outer sheath between the two circular cutting positions, performing 45-degree chamfering treatment on the outer side of the removed outer sheath circular ring from the outer surface to the inner surface, performing 45-degree chamfering treatment on the two cut ends from the outer surface to the inner surface, cleaning asphalt on the inner surface of the outer sheath for later use, and performing 45-degree chamfering treatment on the cable corrugated aluminum sheath circular cutting positions.
Further, the step 3 includes the steps of:
step 3.1, returning the cut outer sheath;
step 3.2, performing thermal restoration treatment by using the filling solder;
3.3, winding the insulating self-adhesive tape, the waterproof tape and the PVC tape layer by layer at the place subjected to the thermal restoration treatment in the step 3.2;
and 3.4, performing a sheath voltage-withstanding experiment on the repaired cable, ending the experiment if the experiment passes, otherwise, searching a discharge point at the repaired position and repairing, and repeating the step after the repair is finished until the experiment passes.
Moreover, the step 3.1 is specifically realized by the following steps: and (4) buckling the cleaned outer sheath subjected to 45-degree chamfering back to the position where the outer sheath is broken according to the corrugated aluminum thread shape of the cable, and tightly binding the buckled outer sheath by using a binding wire to enable the annularly cut outer sheath to be tightly attached to the corrugated aluminum sheath.
Moreover, the step 3.2 is specifically realized by the following steps: heating the butt joint of the outer sheaths at the circular cutting positions to melt the outer sheaths at the butt joint, melting the front ends of the filling solders prepared in the step 2.1 in the processed 45-degree chamfer, loosening the binding wires bound on the sheaths after the two circular cutting positions are melted and welded, and melting and welding the cut-through parts with the filling solders.
Moreover, the step 3.3 is specifically realized by the following steps: winding a plurality of layers of insulating self-adhesive tapes, winding a plurality of layers of waterproof tapes outside the insulating self-adhesive tapes, and finally winding a plurality of layers of PVC adhesive tapes outside the waterproof tapes in a half lap joint manner.
The invention has the advantages and positive effects that:
according to the invention, a sheath withstand voltage test is carried out on the cable to be repaired before repair; preparing a solder for filling in advance, breaking the outer sheath of the cable, and chamfering the cut outer sheath and the cut at 45 degrees; the buffer layer of the cut outer sheath is repaired, the cut outer sheath is butted at the cut after the repair, the welding flux for filling is used for welding, finally, the insulating self-adhesive tape, the waterproof tape and the PVC adhesive tape are used for processing, and the cable outer sheath can be used after the sheath withstand voltage test is carried out again. The high-voltage cable outer sheath has small breaking size, excellent sealing performance and simple and convenient recovery process, and effectively ensures the sealing performance and the electrical performance of the cable outer sheath. The safe and reliable operation of the cable is ensured.
Drawings
FIG. 1 is a flow chart of the present invention;
FIG. 2 is a schematic view of the cable with the outer jacket removed in accordance with the present invention;
FIG. 3 is a schematic diagram of a chamfer angle on a cut surface of the cable outer sheath ring according to the present invention;
FIG. 4 is a schematic view of an outer jacket ring-cut chamfer treatment in accordance with the present invention;
FIG. 5 is a schematic view of the aluminum sheath and the outer sheath of the cable according to the present invention.
Description of the drawings:
1-a cable outer sheath to be repaired; 2-position of circular cut; 3-cutting through position; 4-chamfering the cable corrugated aluminum sheath at an angle of 45 degrees; 5-penetrating the outer side of the removed outer sheath ring from the outer surface to the position of a chamfer of 45 degrees on the inner surface; 6-solder for filling.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
A method for breaking and repairing an outer sheath in cooperation with repairing a buffer layer of a high-voltage cable is disclosed, as shown in figure 1, and comprises the following steps:
And (3) carrying out a sheath withstand voltage test on the cable to be repaired, if the test is passed, carrying out the step (2), otherwise, searching for a sheath damage point and repairing, and repeating the step after the repair is finished until the sheath withstand voltage test is passed.
And 2, breaking the outer sheath of the cable.
And 2.1, removing the graphite layer or the semi-conducting layer within a certain range at two sides of the pre-opening hole.
The preparation method of the solder for filling comprises the following steps: preparing an outer sheath made of the same material as the outer sheath 1 of the cable to be repaired in advance at two positions of filling medium and vacuumizing of the cable to be repaired, removing the internal asphalt, graphite layer or outer semi-conducting layer, and cutting into narrow strips with the width of about 1cm by a knife to be used as welding fluxes for filling.
As shown in fig. 2, a glass sheet or a cleaning agent is used to remove the graphite layer or the semi-conductive layer within 20cm of each side of the corrugated aluminum sheath of the pre-perforated or broken cable.
And 2.2, circularly cutting the outer sheath at the positions 2 circularly cut at two sides of the pre-opening position at a certain distance, and chamfering 45 degrees at the cutting position.
And performing outer sheath circular cutting at the positions 5cm away from both sides of the pre-perforated or broken cable corrugated aluminum sheath by using a cable outer sheath circular cutting knife, and performing cutting-through at a position 3 where the electric knife is cut-through along the direction of the cable core.
And 2.3, stripping the outer sheath at the circular cutting position in the step 2.2 and reserving for later use to obtain the buffer layer for breaking the aluminum sheath.
As shown in fig. 3, an outer sheath between two ring-cut parts is removed by using a tool such as a straight screwdriver, as shown in fig. 4, chamfering is carried out on the position 5 of the removed outer sheath ring penetrating from the outer surface to the inner surface for chamfering by 45 degrees, the two cut-through ends penetrate from the outer surface to the inner surface for chamfering by 45 degrees, asphalt on the inner surface of the outer sheath is cleaned for standby, and chamfering is carried out on the position 4 of the cable corrugated aluminum sheath ring-cut part chamfered by 45 degrees.
And 2.4, repairing the buffer layer obtained in the step 2.3.
And 3, recovering the sealing performance of the cable outer sheath.
And 3.1, returning the cut outer sheath.
And (4) buckling the cleaned outer sheath subjected to 45-degree chamfering back to the position where the outer sheath is broken according to the corrugated aluminum thread shape of the cable, and tightly binding the buckled outer sheath by using a binding wire to enable the annularly cut outer sheath to be tightly attached to the corrugated aluminum sheath.
And 3.2, performing thermal restoration treatment by using the filling solder.
As shown in fig. 5, the butt joint of the outer sheaths at the circular cut parts is heated by a hot air gun to melt the outer sheath at the butt joint, the front end of the filling solder 6 prepared in step 2.1 is melted in the processed chamfer of 45 degrees by the hot air gun, the filling height is slightly higher than the outer sheath of the cable, after the two circular cut parts are melted and welded, the binding wires bound on the sheaths are loosened, and the cut-through parts are melted and welded by the filling solder by the hot air gun.
And 3.3, winding the insulating self-adhesive tape, the waterproof tape and the PVC tape layer by layer at the position subjected to the thermal restoration treatment in the step 3.2.
2 layers of insulating self-adhesive tapes are wound, the self-adhesive tapes are pressed to pass through two sides of the circular cutting part respectively by 5cm to strengthen the insulating property, 2 layers of waterproof tapes are wound outside the insulating self-adhesive tapes, the waterproof tapes are pressed by 5cm to pass through the insulating self-adhesive tapes, and finally, 2 layers of PVC (polyvinyl chloride) adhesive tapes are wound outside the waterproof tapes in a half-lap joint mode, so that the waterproof tapes are not influenced by the external environment.
And 3.4, performing a sheath voltage-withstanding experiment on the repaired cable, ending the experiment if the experiment passes, otherwise, searching a discharge point at the repaired position and repairing, and repeating the step after the repair is finished until the experiment passes.
The sheath withstand voltage test is a direct current 10kV, 1 minute withstand voltage test.
It should be emphasized that the embodiments described herein are illustrative rather than restrictive, and thus the present invention is not limited to the embodiments described in the detailed description, but also includes other embodiments that can be derived from the technical solutions of the present invention by those skilled in the art.
Claims (3)
1. A method for breaking and repairing an outer sheath in cooperation with repair of a buffer layer of a high-voltage cable is characterized by comprising the following steps: the method comprises the following steps:
step 1, performing a sheath withstand voltage test on a cable to be repaired, if the test is passed, performing step 2, otherwise, searching for a sheath damage point and repairing, and repeating the steps after the repair is completed until the sheath withstand voltage test is passed;
step 2, breaking the outer sheath of the cable;
step 2.1, removing the graphite layer or the semi-conducting layer within a certain range at two sides of the pre-opening hole;
preparing an outer sheath made of the same material as the outer sheath of the cable to be repaired, removing internal asphalt, a graphite layer or an outer semi-conducting layer, and preparing a filling solder; removing the graphite layer or the semi-conducting layer in a certain range at both sides of the pre-perforated or broken cable corrugated aluminum sheath;
step 2.2, circularly cutting the outer sheath at two sides of the pre-opening position at a certain distance, and chamfering the cutting position for 45 degrees;
performing outer sheath circular cutting at a certain distance from two sides of the pre-hole or the position where the corrugated aluminum sheath of the cable is broken, and cutting through the outer sheaths at the two circular cutting positions along the direction of the fiber core of the cable;
step 2.3, stripping the outer sheath at the circular cutting position in the step 2.2 and reserving the outer sheath for later use to obtain a buffer layer for breaking the aluminum sheath;
removing the outer sheath between the two circular cutting positions, performing 45-degree chamfering treatment on the outer side of the circular ring of the removed outer sheath from the outer surface to the inner surface, performing 45-degree chamfering treatment on the two cut ends from the outer surface to the inner surface, cleaning the asphalt on the inner surface of the outer sheath for later use, and performing 45-degree chamfering treatment on the circular cutting positions of the corrugated aluminum sheath of the cable
Step 2.4, repairing the buffer layer obtained in the step 2.3;
step 3, restoring the sealing performance of the cable outer sheath;
step 3.1, returning the cut outer sheath; buckling the cleaned outer sheath subjected to 45-degree chamfering back to the position where the outer sheath is broken according to the corrugated aluminum thread shape of the cable, and tightly binding the buckled outer sheath by using a binding wire to enable the annularly cut outer sheath to be tightly attached to the corrugated aluminum sheath;
step 3.2, performing thermal restoration treatment by using the filling solder;
3.3, winding the insulating self-adhesive tape, the waterproof tape and the PVC tape layer by layer at the place subjected to the thermal restoration treatment in the step 3.2;
and 3.4, performing a sheath voltage-withstanding experiment on the repaired cable, ending the experiment if the experiment passes, otherwise, searching a discharge point at the repaired position and repairing, and repeating the step after the repair is finished until the experiment passes.
2. The method for breaking and repairing the outer sheath of the buffer layer of the high-voltage cable in cooperation with repairing the buffer layer of the high-voltage cable according to claim 1, wherein the method comprises the following steps: the specific implementation method of the step 3.2 is as follows: heating the butt joint of the outer sheaths at the circular cutting positions to melt the outer sheaths at the butt joint, melting the front ends of the filling solders prepared in the step 2.1 in the processed 45-degree chamfer, loosening the binding wires bound on the sheaths after the two circular cutting positions are melted and welded, and melting and welding the cut-through parts with the filling solders.
3. The method for breaking and repairing the outer sheath of the buffer layer of the high-voltage cable in cooperation with repairing the buffer layer of the high-voltage cable according to claim 1, wherein the method comprises the following steps: the specific implementation method of the step 3.3 is as follows: winding a plurality of layers of insulating self-adhesive tapes, winding a plurality of layers of waterproof tapes outside the insulating self-adhesive tapes, and finally winding a plurality of layers of PVC adhesive tapes outside the waterproof tapes in a half lap joint manner.
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| CN202111237379.4A CN113690808B (en) | 2021-10-25 | 2021-10-25 | Outer sheath breaking and repairing method used in repair of high-voltage cable buffer layer |
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| CN202111237379.4A CN113690808B (en) | 2021-10-25 | 2021-10-25 | Outer sheath breaking and repairing method used in repair of high-voltage cable buffer layer |
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| CN113690808A CN113690808A (en) | 2021-11-23 |
| CN113690808B true CN113690808B (en) | 2022-02-22 |
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| CN118659263A (en) * | 2024-08-20 | 2024-09-17 | 国网上海市电力公司 | Repairing method and device for metal sheath of high-voltage cable body |
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| CN107732803A (en) * | 2017-10-19 | 2018-02-23 | 中国水利水电第十四工程局有限公司 | A kind of restorative procedure of heavy in section low voltage single core flexible cable |
| CN107994517A (en) * | 2017-11-22 | 2018-05-04 | 广东科启电力技术有限公司 | 10kV to 35kV cable craft fusing type straight couplings production method |
| CN108683119A (en) * | 2018-05-08 | 2018-10-19 | 国网天津市电力公司 | A kind of 10kV power cables single-phase fault restorative procedure |
| CN111711129A (en) * | 2020-06-29 | 2020-09-25 | 中国化学工程第十一建设有限公司 | Construction method for searching and repairing fault of outer sheath of single-core high-voltage cable |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2874880Y (en) * | 2006-07-26 | 2007-02-28 | 夏云杰 | Middle joint welding fitting for 66KV-500KV crosslink polyvinyl insulation power cable |
| GB2517130A (en) * | 2013-06-07 | 2015-02-18 | Rtl Materials Ltd | Methods of Protecting or Repairing a Cable or Cables and Related Apparatus |
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107732803A (en) * | 2017-10-19 | 2018-02-23 | 中国水利水电第十四工程局有限公司 | A kind of restorative procedure of heavy in section low voltage single core flexible cable |
| CN107994517A (en) * | 2017-11-22 | 2018-05-04 | 广东科启电力技术有限公司 | 10kV to 35kV cable craft fusing type straight couplings production method |
| CN108683119A (en) * | 2018-05-08 | 2018-10-19 | 国网天津市电力公司 | A kind of 10kV power cables single-phase fault restorative procedure |
| CN111711129A (en) * | 2020-06-29 | 2020-09-25 | 中国化学工程第十一建设有限公司 | Construction method for searching and repairing fault of outer sheath of single-core high-voltage cable |
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Address after: No. 8, Haitai Huake 4th Road, Huayuan Industrial Zone, High tech Zone, Binhai New Area, Tianjin, 300384 Patentee after: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF STATE GRID TIANJIN ELECTRIC POWER Co. Patentee after: STATE GRID TIANJIN ELECTRIC POWER Co. Patentee after: STATE GRID CORPORATION OF CHINA Address before: No.8, Haitai Huake 4th Road, Xiqing District, Tianjin 300384 Patentee before: ELECTRIC POWER SCIENCE & RESEARCH INSTITUTE OF STATE GRID TIANJIN ELECTRIC POWER Co. Patentee before: STATE GRID TIANJIN ELECTRIC POWER Co. Patentee before: STATE GRID CORPORATION OF CHINA |
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