CN111740355A - High-voltage cable joint repairing method - Google Patents
High-voltage cable joint repairing method Download PDFInfo
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- CN111740355A CN111740355A CN202010654968.1A CN202010654968A CN111740355A CN 111740355 A CN111740355 A CN 111740355A CN 202010654968 A CN202010654968 A CN 202010654968A CN 111740355 A CN111740355 A CN 111740355A
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- cable
- repair
- repairing
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- broken
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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
- H02G1/14—Methods or apparatus specially adapted for installing, maintaining, repairing or dismantling electric cables or lines for joining or terminating cables
- H02G1/145—Moulds
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- Processing Of Terminals (AREA)
Abstract
The invention relates to a high-voltage cable joint repairing method, belonging to the technical field of cable maintenance, and comprising the following steps: firstly, the broken wires at two ends are arranged to be flat, and the broken copper cores are connected together in a cold welding mode, so that the appearance of the broken copper cores is the same as that of a new wire; cleaning the main insulating edge, lapping and winding the main insulating edge by adopting a cable repair tape until the whole damaged part is covered so as to reduce the distribution size of an electric field, and then winding and recovering the main insulating edge by adopting a high-strength semi-conductive adhesive tape and a copper shielding net; then, one set of mold is selected according to the diameter of the cable, polyurethane is adopted for pouring, the mold is removed after primary curing till complete curing is achieved, so that the insulation performance and the wear resistance of the cable are ensured, the fault rate of the cable is greatly reduced on the premise that the performance of the repaired cable is basically consistent with that of the cable before damage is ensured, the requirements on repair tools and material cost are lower, the construction time is shorter, the efficiency is higher, the requirements on the environment are not high, and the repair can be completed as long as rain and snow weather is avoided.
Description
Technical Field
The invention relates to the field of cable maintenance, in particular to a high-voltage cable joint repairing method.
Background
In the traditional technology for repairing the high-voltage cable joint at present, a cold bonding method is generally adopted as a repairing method, the repairing process comprises the steps of firstly connecting wires by using a hydraulic wire pressing clamp, then connecting the cables by using a copper pipe, then winding a layer of insulating tape on the outer surface of the cables, and finally using a heat-shrinkable tube as an outer skin, wherein after the repairing of one cable head is usually completed, the diameter of the cable at the repaired part is far larger than the original wire diameter.
In the process of implementing the embodiment of the invention, the inventor finds that at least the following defects exist in the background art;
the diameter of the repaired cable is far larger than the original diameter of the cable, so that the repaired part of the cable is more easily damaged, and particularly, when the repairing method is used for repairing the joint of the traveling cable, the abrasion speed is accelerated, and the diameter of the repaired cable is far larger than the original diameter of the cable, so that the coiling and uncoiling of the cable can be influenced by the protruding part of the repaired cable when the cable is coiled on a cable reel.
Although the casting method is used for replacing the procedure of repairing the cable sheath in the cold bonding method, the effect that the diameter of the repaired cable is basically the same as that before the repair can be achieved, the diameter of the repaired cable is very close to the original wire diameter when the cable sheath is repaired due to the former processes, and if the cable sheath is repaired by the casting method, the thickness of the cable sheath is thin, so that a good protection effect cannot be achieved, and the fault rate of the repaired cable is increased.
Disclosure of Invention
The invention provides a high-voltage cable joint repairing method, which aims to solve the technical problems that the existing cable repairing process has obvious cable protrusion after being repaired by a cold bonding method and the grounding short circuit fault is easy to occur in the procedure of repairing the cable sheath by using a hot sulfur method and a pouring method instead of the cold bonding method;
the method comprises the following steps of firstly, arranging and flattening broken wires at two ends, and connecting the broken copper cores together in a cold welding mode to ensure that the broken wires are not different from new wires in appearance;
cleaning the main insulating edge, winding by adopting a cable repair tape until the whole damaged part is covered so as to reduce the distribution size of an electric field, and then winding and recovering by adopting a high-strength semi-conductive adhesive tape and a copper shielding net;
and step three, selecting a set of mold according to the diameter of the cable, pouring by adopting polyurethane, and removing the mold after primary curing till complete curing so as to ensure the insulating property and the wear-resisting property of the cable.
Furthermore, the cable joint is subjected to butt joint repair by a cold welding method according to the metal memory principle, and people in the field can select various types of cold welding instruments according to different wire diameters and working environments.
Furthermore, in the first step, a pliers type cold welding machine is used for carrying out cold welding treatment on the wires at two ends, and the copper cores at two ends of the broken wires are extruded into a whole.
Further, the winding method of the cable repair tape in the second step includes the step of firstly inclining the cable repair tape by a certain angle to wind the cable repair part until the whole damaged part is covered.
Furthermore, the cable repair tape is a novel repair adhesive tape for the power cable.
Preferably, the novel repairing adhesive tape for the power cable is a novel repairing adhesive tape for a CTN-03 power cable.
Furthermore, the winding method of the cable repair tape in the second step is that the cable repair tape is firstly wound in a 45-degree inclined manner for the first circle, and then the second circle of the cable repair tape covers the 1/2 position of the first circle and is continuously wound in one direction until the whole damaged part is covered.
Preferably, the winding method of the cable repair tape in the second step includes firstly wrapping the cable repair tape in a 45-degree inclined manner for the first circle, then covering the 1/2 position of the first circle with the second circle of cable repair tape, and continuing to wrap the first circle in one direction until the whole damaged part is covered, and in the same process, 2 cycles are needed to make the electric field distribution more stable.
Further, the copper shielding net in the second step is a zinc-plated copper shielding net or a tin-plated copper shielding net.
Furthermore, the mould in the third step is made of a PVC pipe with the diameter larger than that of the cable to be repaired, and the mould is fixed on the cable through a cable fixing clamp.
Furthermore, in the step 3, before casting, the cable repair part is cleaned by using a cleaning agent, and a mold is coated with a release agent, so that the repair effect is enhanced, and the subsequent demolding operation is facilitated.
Further, the polyurethane is a bi-component polyurethane adhesive.
Furthermore, in the third step, after the mould is removed after the primary curing, the maintenance part is polished to be as thick as the cable diameter.
Further, after polishing, the polishing pad is wrapped by a self-powered heat tracing insulating sleeve to accelerate curing, and after curing, the insulating sleeve is removed.
Has the beneficial effects that; according to the method, the cable repair process is improved, the surface thickness of the repaired cable can be basically consistent with that of the original cable through the mutual matching of the repair processes in all steps, the performance of the repaired cable can be basically consistent with that of the cable before damage, the cable joint, particularly a traveling cable, can be completely repaired instead of a cold bonding method, the fault rate of the repaired cable is greatly reduced, and the problems that when the outer skin of the cable is to be repaired due to the existing cable repair process, the diameter of the cable at the repaired part is very close to the original diameter of the cable, the outer skin of the repaired cable is too thin and the fault rate is high due to the pouring method are solved.
DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION
In order to make the objects, technical solutions and advantages of the present invention more apparent, the technical solutions of the present invention will be described in detail below. It is to be understood that the described embodiments are merely exemplary of the invention, and not restrictive of the full scope of the invention. All other embodiments, which can be derived by a person skilled in the art from the examples given herein without any inventive step, are within the scope of the present invention.
A high-voltage cable joint repairing method comprises the following steps;
the method comprises the following steps of firstly, arranging and flattening broken wires at two ends, carrying out cold welding treatment on copper cores of the wires at the two ends by using a pliers type cold welding machine, and extruding the copper cores at the two ends of the broken wires into a whole, so that the broken wires are not different from new wires in appearance;
cleaning the main insulation edge, lapping and winding by adopting a novel repairing adhesive tape of the CTN-03 power cable until the whole damaged part is covered so as to reduce the distribution size of an electric field, and then winding and recovering by adopting a high-strength semi-conductive adhesive tape and a galvanized copper shielding net;
and step three, selecting a set of mold according to the diameter of the cable, adopting bi-component polyurethane glue as a pouring filler, pouring by using an electric glue gun, removing the mold after primary curing, and completely curing to ensure the insulating property and the wear-resisting property of the cable.
The method for lapping and winding the cable repair tape in the high-voltage cable joint repair method comprises the following steps:
after wrapping the first circle with the novel repair sticky tape of CTN-03 power cable 45 degrees slope, the second circle cable repair area covers first circle 1/2 position and continues to wrap along a direction, until covering whole damage position, same technology need do 2 cycles, adopts such mode of wrapping, and electric field distribution is stable, and the radiation to the human body is nearly zero, can not produce any influence to the electric field voltage of cable hardly.
The types and the using method of the die are as follows:
the PVC pipe with the diameter larger than the wire diameter is used as an outer die, the outer die is fixed on the cable by using a cable fixing card, the cable maintenance part is cleaned by using cleaning agents such as acetone and alcohol before pouring, and the die is coated with a release agent. After the preparation work is finished, pouring is carried out by using an electric glue gun, the mould is removed after the preliminary solidification, and the maintenance part is polished to be as thick as the cable diameter.
This application step one is compared with the clamp wiring that general repair technology used through the copper core in the mode connecting cable of cold welding, and its crimping position is more smooth, makes it simply polish and can get into next process to need not to polish its surface smoothness degree once more after skilled and can reach the standard that gets into next process.
The process can be used after pouring is completed in summer for 3 hours, and the heat tracing band can be used for heating to shorten the curing time during construction in winter.
The above description is only for the specific embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the present invention shall be covered thereby. Therefore, the protection scope of the present invention shall be subject to the protection scope of the appended claims.
Claims (8)
1. A high-voltage cable joint repairing method is characterized by comprising the following steps;
the method comprises the following steps of firstly, arranging and flattening broken wires at two ends, and connecting the broken copper cores together in a cold welding mode to ensure that the broken wires are not different from new wires in appearance;
cleaning the main insulating edge, lapping and winding the main insulating edge by adopting a cable repair tape until the whole damaged part is covered so as to reduce the distribution size of an electric field, and then winding and recovering the main insulating edge by adopting a high-strength semi-conductive adhesive tape and a copper shielding net;
and step three, selecting a set of mold according to the diameter of the cable, pouring by adopting polyurethane, and removing the mold after primary curing till complete curing so as to ensure the insulating property and the wear-resisting property of the cable.
2. The method for repairing a high-voltage cable joint as claimed in claim 1, wherein in the first step, the two ends of the cable are cold-welded by using a pliers-type cold welding machine to connect the broken copper cores together.
3. The method for repairing a high voltage cable joint as claimed in claim 1, wherein the winding of the cable repair tape in the second step is performed by wrapping the cable repair tape around the first turn at an angle of 45 degrees, and then wrapping the cable repair tape around the first turn 1/2 in one direction until the whole damaged portion is covered.
4. The method for repairing a high-voltage cable joint as claimed in claim 1, wherein the copper shielding mesh in the second step is a zinc-plated copper shielding mesh or a tin-plated copper shielding mesh.
5. The method for repairing a high-voltage cable joint according to claim 1, wherein in the third step, before casting, the cable repair part is cleaned by using a cleaning agent, and a mold is coated with a release agent.
6. The method of claim 1, wherein the polyurethane is a two-component polyurethane adhesive.
7. A method for repairing a high voltage cable joint as claimed in claims 1-6, wherein after initial curing, the mould is removed and the repair site is ground to a diameter equal to the cable diameter.
8. The method of claim 7, wherein the insulation jacket is wrapped with a self-heating insulation jacket to accelerate the curing process after the polishing process is completed, and the insulation jacket is removed after the curing process is completed.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010654968.1A CN111740355A (en) | 2020-07-09 | 2020-07-09 | High-voltage cable joint repairing method |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202010654968.1A CN111740355A (en) | 2020-07-09 | 2020-07-09 | High-voltage cable joint repairing method |
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| CN111740355A true CN111740355A (en) | 2020-10-02 |
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| CN202010654968.1A Pending CN111740355A (en) | 2020-07-09 | 2020-07-09 | High-voltage cable joint repairing method |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113410720A (en) * | 2021-06-04 | 2021-09-17 | 国网河北省电力有限公司石家庄供电分公司 | Power cable welding recovery method |
| CN115064980A (en) * | 2022-06-22 | 2022-09-16 | 广东电网有限责任公司广州供电局 | Perfusion method for accelerating solidification of cable repair liquid |
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| CN102664380A (en) * | 2012-04-19 | 2012-09-12 | 中天科技海缆有限公司 | Flexible joint for 220kV crosslinked polyethylene submarine cables and method for manufacturing flexible joint |
| CN104734082A (en) * | 2015-01-09 | 2015-06-24 | 国家电网公司 | Damaged cable repairing pouring device and pouring usage method |
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| CN113410720A (en) * | 2021-06-04 | 2021-09-17 | 国网河北省电力有限公司石家庄供电分公司 | Power cable welding recovery method |
| CN115064980A (en) * | 2022-06-22 | 2022-09-16 | 广东电网有限责任公司广州供电局 | Perfusion method for accelerating solidification of cable repair liquid |
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Application publication date: 20201002 |
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