CN115117799B - Treatment method for water inflow or damage and damp of extra-high voltage cable - Google Patents
Treatment method for water inflow or damage and damp of extra-high voltage cable Download PDFInfo
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- CN115117799B CN115117799B CN202210817395.9A CN202210817395A CN115117799B CN 115117799 B CN115117799 B CN 115117799B CN 202210817395 A CN202210817395 A CN 202210817395A CN 115117799 B CN115117799 B CN 115117799B
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 28
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 48
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 24
- 238000004804 winding Methods 0.000 claims abstract description 12
- 230000001105 regulatory effect Effects 0.000 claims abstract description 11
- 238000001035 drying Methods 0.000 claims abstract description 7
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 239000002390 adhesive tape Substances 0.000 claims description 23
- 238000007789 sealing Methods 0.000 claims description 14
- RNFJDJUURJAICM-UHFFFAOYSA-N 2,2,4,4,6,6-hexaphenoxy-1,3,5-triaza-2$l^{5},4$l^{5},6$l^{5}-triphosphacyclohexa-1,3,5-triene Chemical compound N=1P(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP(OC=2C=CC=CC=2)(OC=2C=CC=CC=2)=NP=1(OC=1C=CC=CC=1)OC1=CC=CC=C1 RNFJDJUURJAICM-UHFFFAOYSA-N 0.000 claims description 9
- 239000003063 flame retardant Substances 0.000 claims description 9
- 230000037303 wrinkles Effects 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 4
- 238000003672 processing method Methods 0.000 abstract description 2
- 230000008439 repair process Effects 0.000 description 4
- 230000005540 biological transmission Effects 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000007547 defect Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 238000009736 wetting Methods 0.000 description 2
- 240000005572 Syzygium cordatum Species 0.000 description 1
- 235000006650 Syzygium cordatum Nutrition 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000032683 aging Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000004891 communication Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 239000012535 impurity Substances 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 239000000463 material Substances 0.000 description 1
Classifications
-
- 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
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/14—Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
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- Cable Accessories (AREA)
- Processing Of Terminals (AREA)
Abstract
The invention discloses a method for treating water inflow or damage dampness of an extra-high voltage cable, which comprises the following steps: step S100: inspecting the cable; step S200: raising the first end of the cable to form a high-low drop with the second end, and binding and fixing; step S300: the cable is connected to the nitrogen cylinder; step S400: cleaning an outer sheath and a wrapping part of the cable, and uniformly winding by adopting a self-limiting temperature electric tracing band; step S500: the self-temperature-limiting electric tracing band is electrically heated, the surface temperature of the cable is measured by a thermometer at intervals of set time, and when the surface temperature reaches the set temperature, the regulating valve of the nitrogen cylinder is opened, and the set pressure is kept for continuous air supply; step S600: and (3) measuring the nitrogen humidity of the first end port of the cable by adopting a humidity detector, stopping heating and closing the regulating valve of the nitrogen cylinder when the nitrogen humidity is lower than the set humidity, and immediately plugging the two ends of the cable by using two plugs, so that the drying is finished. The processing method for the water inlet or damage and moisture of the extra-high voltage cable is used for drying the cable, so that the cable is effectively repaired, and the energy waste is reduced.
Description
Technical Field
The invention relates to the technical field of cable repair, in particular to a method for treating water inflow or damage damp of an extra-high voltage cable.
Background
The extra-high voltage cable is a power cable which appears along with the continuous development of cable technology, belongs to a high voltage cable with higher technical content, is generally used as a central tie in a large-scale power transmission system, bears the task of transmitting power generated by a power plant to a load center or an electric substation in an electric network through a long-distance power transmission line, and enables the power to exert great economic benefit on national production.
The extra-high voltage cable has a complex structure, high process requirements, large and heavy cables, extremely high production, transportation and laying requirements, and needs professional companies and teams to produce, install and lay, but the outdoor environment is complex, accidents sometimes occur in the laying process, or the ends are not sealed well during laying and installation, so that the cables are locally damaged, and water or vapor enters the cables. After the cable is in water or wetted, the phenomenon of 'water tree aging' can occur under the action of an electromagnetic field, and finally the cable can be broken down and scrapped.
At present, the problem of water inflow or damp of an extra-high voltage cable does not have a good solution, a common treatment method is to make an intermediate joint or replace the whole cable, namely, the damp or water inflow part is needed to be cut off, and then the whole cable is spliced, because the structure is complex, the cable is made into a joint, a large amount of manpower and material resources are needed, the performance and the service life of the joint cannot be compared with those of a cable body, the economic benefit of the whole transmission line is affected, the whole cable is replaced, huge waste is caused, a new power system cannot be delivered on time, and the generated loss cannot be measured.
Disclosure of Invention
Based on the problems, the invention aims to provide a method for treating water inflow or damage and damp of an extra-high voltage cable, which solves the problems that the existing repair technology has defects and cannot be effectively repaired after water inflow or internal damp of the cable.
In order to achieve the above purpose, the invention adopts the following technical scheme:
a method for treating water inflow or damage and damp of an extra-high voltage cable comprises the following steps:
step S100: checking the cable, wrapping and sealing the damaged part, and vertically or obliquely arranging the cable to freely discharge water vapor in the cable;
step S200: raising the first end of the cable to form a high-low drop with the second end, and binding and fixing;
step S300: the second end of the cable is provided with a sealing cap in a sealing way, a hose extends out of the sealing cap and is connected to the nitrogen cylinder, and an outlet of the nitrogen cylinder is provided with a regulating valve;
step S400: cleaning an outer sheath and a wrapping part of the cable, ensuring that the surface is clean and smooth and free of foreign matters, and uniformly winding by adopting a self-limiting temperature electric tracing band;
step S500: the self-temperature-limiting electric tracing band is electrically heated, the surface temperature of the cable is measured by a thermometer at intervals of set time, and when the surface temperature reaches the set temperature, the regulating valve of the nitrogen cylinder is opened, and the set pressure is kept for continuous air supply;
step S600: and (3) measuring the nitrogen humidity of the first end port of the cable by adopting a humidity detector, stopping heating and closing the regulating valve of the nitrogen cylinder when the nitrogen humidity is lower than the set humidity, and immediately plugging the two ends of the cable by using two plugs, so that the drying is finished.
Further, in step S100, if the cable is damaged, the damaged portion is cleaned first, the smoothness and flatness of the outer sheath are ensured, a 15cm position on one side of the damaged portion is set as a first point, a 15cm position on the other side is set as a second point, a 5cm position on the outer side of the first point is set as a third point, a 5cm position on the outer side of the second point is set as a fourth point, and the first point and the second point are lapped and wound by a high-voltage rubber insulating self-adhesive tape, and then the third point and the fourth point are lapped and wound by a PVC electrical flame-retardant tape, and after the two layers of winding are completed, whether leakage packages and wrinkles exist is checked, and the appearance is round and free of defects is ensured.
Further, when the high-voltage rubber insulating self-adhesive tape is wound, the high-voltage rubber insulating self-adhesive tape is uniformly wound to a second point clockwise from the first point, and then uniformly wound back to the first point anticlockwise from the second point; when the PVC electrical flame-retardant adhesive tape is wound, the PVC electrical flame-retardant adhesive tape is uniformly wound to a fourth point clockwise from the third point, and then uniformly wound back to the third point anticlockwise from the fourth point.
Further, the winding covering rate was 50% ± 5%.
Further, in step S100, if the cable is severely fed, the feeding end is treated first to ensure that the end is free of impurities, the outer sheath with a length of about 5cm is cut off, the feeding end is lower than the other end by about 1m, the cable is left to stand flat after the water freely flows dry, and then the subsequent steps are performed.
Further, in step S200, the set value of the height drop is 1m.
Further, in step S300, the connection between the sealing cap and the second end of the cable is sealed and fixed by the high-pressure self-adhesive tape and the laryngeal cuff.
Further, in step S500, the time is set to 2min, the temperature is set to 80 ℃, and the pressure is set to 0.2MPa.
Further, in step S600, the humidity is set to 10%, and the connection between the plug and the two ends of the cable is sealed and fixed by using a high-pressure self-adhesive tape and a hose clamp.
In summary, the method for treating the water inlet or damage and damp of the extra-high voltage cable has the beneficial effects that the cable is subjected to drying treatment aiming at the damage and damp or water inlet condition of the cable, and the method is different from a mode of making an intermediate joint, so that the performance difference between a repair section and a cable body is avoided, the cable is effectively repaired, and the energy waste is reduced.
Drawings
Fig. 1 is a schematic diagram of a method for treating water inflow or damage and damp of an extra-high voltage cable according to an embodiment of the present invention.
Detailed Description
Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to like or similar parts throughout, or parts having like or similar functions. The embodiments described below by referring to the drawings are illustrative and intended to explain the present invention and should not be construed as limiting the invention.
In the description of the present invention, unless explicitly stated and limited otherwise, the terms "connected," "connected," and "fixed" are to be interpreted broadly, as for example, they may be fixedly connected, or may be detachably connected, or may be electrically connected, or may be directly connected, or may be indirectly connected through an intermediary, or may be in communication with one another in two elements or in an interaction relationship between two elements. The specific meaning of the above terms in the present invention can be understood by those of ordinary skill in the art according to the specific circumstances.
In the description of the present invention, unless explicitly stated and limited otherwise, a first feature "above" or "below" a second feature may include the first feature and the second feature being in direct contact, or may include the first feature and the second feature not being in direct contact but being in contact by another feature therebetween. Moreover, a first feature being "above," "over" and "on" a second feature includes the first feature being directly above and obliquely above the second feature, or simply indicating that the first feature is higher in level than the second feature. The first feature being "under", "below" and "beneath" the second feature includes the first feature being directly under and obliquely below the second feature, or simply means that the first feature is less level than the second feature.
The technical scheme of the invention is further described below by the specific embodiments with reference to the accompanying drawings.
Referring to fig. 1, the preferred embodiment provides a method for treating water inlet or damage and damp of an extra-high voltage cable, which comprises the following steps:
step S100: the cable 1 is inspected, the damaged part is wrapped and sealed, and the cable 1 is vertically or obliquely arranged, so that the internal water vapor is freely discharged.
The damage is affected with damp and the water is fed differently, and the treatment is needed to be distinguished.
If the cable 1 is damaged, firstly cleaning the damaged part, ensuring smoothness and flatness of the outer sheath, setting a first point at 15cm on one side of the damaged point, a second point at 15cm on the other side of the damaged point, setting a third point at 5cm on the outer side of the first point, and setting a fourth point at 5cm on the outer side of the second point, wherein the first point and the second point are lapped and wound through a high-voltage rubber insulating self-adhesive tape, and then the third point and the fourth point are lapped and wound through a PVC electrical flame-retardant adhesive tape, checking whether leakage bags and wrinkles exist after two layers of winding are completed, ensuring round and defect-free appearance, wherein a half lapping mode is preferably adopted during winding, and the lapping rate is 50% +/-5%.
Further, in order to ensure the tightness of the damaged part, when the high-voltage rubber insulating self-adhesive tape is wound, the high-voltage rubber insulating self-adhesive tape is firstly uniformly wound to a second point clockwise from the first point, and then uniformly wound back to the first point anticlockwise from the second point; when the PVC electrical flame-retardant adhesive tape is wound, the PVC electrical flame-retardant adhesive tape is uniformly wound to a fourth point clockwise from the third point, and then uniformly wound back to the third point anticlockwise from the fourth point, so that the protection property of the damaged part is fully ensured.
If the water inflow of the cable 1 is serious, firstly, the water inflow end is treated, so that the end is free of sundries, an outer sheath with the length of about 5cm is cut off, the water inflow end is lower than the other end by about 1m, the water is discharged after free flowing, and then the subsequent steps are carried out.
Step S200: the first end of the cable 1 is lifted to form a high-low drop with the second end, and the set value of the high-low drop is preferably 1m and is bound and fixed.
Step S300: the second end of the cable 1 is provided with a sealing cap 2 in a sealing manner, the joint of the sealing cap 2 and the second end of the cable 1 is sealed and fixed by a high-pressure self-adhesive tape and a hose hoop, a hose 3 extends out of the sealing cap 2, the hose 3 is connected to a nitrogen cylinder 4, and an outlet of the nitrogen cylinder 4 is provided with a regulating valve 5, so that nitrogen can be introduced into the cable 1 under stable pressure.
Step S400: cleaning the outer sheath and the wrapping part (particularly the damp part) of the cable 1, ensuring the surface to be clean and smooth and free of foreign matters, and uniformly winding by adopting the self-temperature-limiting electric tracing band 6, and ensuring the close contact with the cable to uniformly conduct heat.
Step S500: the self-temperature-limiting electric tracing band 6 is electrified and heated, the surface temperature of the cable 1 is measured by a thermometer 7 every 2min, and when the temperature reaches more than 80 ℃, the regulating valve 5 of the nitrogen bottle 4 is opened, and the pressure of about 0.2MPa is kept for continuous air supply.
Step S600: the nitrogen humidity of the first end port of the cable 1 is measured by adopting the humidity detector 8, when the nitrogen humidity is lower than 10%, the heating is stopped, the regulating valve 5 of the nitrogen cylinder 4 is closed, two plugs are used for plugging the two ends of the cable 1 immediately, and the joint of the plugs and the two ends of the cable 1 is sealed and fixed by using the high-pressure self-adhesive tape and the hose clamp.
Therefore, the drying process is finished, and the water-inflow or damp cable is repaired and can be reused, so that the whole section of scrapping is avoided.
In conclusion, the processing method for the water inlet or damage and wetting of the extra-high voltage cable is used for drying the cable according to the damage and wetting or water inlet condition of the cable, and is different from the mode of making an intermediate joint, the performance difference between the repair section and the cable body is avoided, the cable is effectively repaired, and the energy waste is reduced.
The above embodiments merely illustrate the basic principles and features of the present invention, and the present invention is not limited to the above examples, but can be variously changed and modified without departing from the spirit and scope of the present invention, which is within the scope of the present invention as claimed. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (8)
1. A method for treating water inflow or damage and damp of an extra-high voltage cable is characterized by comprising the following steps of
Step S100: checking a cable, wrapping and sealing a damaged part, vertically or obliquely arranging the cable to enable internal water vapor to be discharged freely, if the cable is serious in water inflow, firstly treating an inflow end, ensuring that the end has no sundries, cutting an outer sheath with the length of about 5cm, enabling the inflow end to be lower than the other end by about 1m, and leveling after the water freely flows to be dry, and then carrying out the subsequent steps;
step S200: raising the first end of the cable to form a high-low drop with the second end, and binding and fixing;
step S300: the second end of the cable is provided with a sealing cap in a sealing way, a hose extends out of the sealing cap and is connected to the nitrogen cylinder, and an outlet of the nitrogen cylinder is provided with a regulating valve;
step S400: cleaning an outer sheath and a wrapping part of the cable, ensuring that the surface is clean and smooth and free of foreign matters, and uniformly winding by adopting a self-limiting temperature electric tracing band;
step S500: the self-temperature-limiting electric tracing band is electrically heated, the surface temperature of the cable is measured by a thermometer at intervals of set time, and when the surface temperature reaches the set temperature, the regulating valve of the nitrogen cylinder is opened, and the set pressure is kept for continuous air supply;
step S600: and (3) measuring the nitrogen humidity of the first end port of the cable by adopting a humidity detector, stopping heating and closing the regulating valve of the nitrogen cylinder when the nitrogen humidity is lower than the set humidity, and immediately plugging the two ends of the cable by using two plugs, so that the drying is finished.
2. The method for treating water inflow or breakage of an extra-high voltage cable according to claim 1, wherein the method comprises the steps of: in step S100, if the cable is damaged, the damaged portion is cleaned first, the smoothness and flatness of the outer sheath are ensured, a 15cm position on one side of the damaged point is set as a first point, a 15cm position on the other side of the damaged point is set as a second point, a 5cm position on the outer side of the first point is set as a third point, a 5cm position on the outer side of the second point is set as a fourth point, high-voltage rubber insulation self-adhesive tape is used for lap winding between the first point and the second point, then PVC electrical flame-retardant adhesive tape is used for lap winding between the third point and the fourth point, and after the two layers of winding are completed, whether leakage packages and wrinkles exist is checked, so that the appearance is round and defect-free is ensured.
3. The method for treating water inflow or breakage of an extra-high voltage cable according to claim 2, wherein the method comprises the steps of: when the high-voltage rubber insulating self-adhesive tape is wound, the high-voltage rubber insulating self-adhesive tape is uniformly wound to a second point clockwise from the first point, and then uniformly wound back to the first point anticlockwise from the second point; when the PVC electrical flame-retardant adhesive tape is wound, the PVC electrical flame-retardant adhesive tape is uniformly wound to a fourth point clockwise from the third point, and then uniformly wound back to the third point anticlockwise from the fourth point.
4. The method for treating water inflow or breakage of an extra-high voltage cable according to claim 3, wherein the method comprises the steps of: the winding covering rate is 50% +/-5%.
5. The method for treating water inflow or breakage of an extra-high voltage cable according to claim 1, wherein the method comprises the steps of: in step S200, the set value of the height drop is 1m.
6. The method for treating water inflow or breakage of an extra-high voltage cable according to claim 1, wherein the method comprises the steps of: in step S300, the joint between the sealing cap and the second end of the cable is sealed and fixed by using a high-pressure self-adhesive tape and a hose clamp.
7. The method for treating water inflow or breakage of an extra-high voltage cable according to claim 1, wherein the method comprises the steps of: in step S500, the set time is 2min, the set temperature is 80 ℃, and the set pressure is 0.2MPa.
8. The method for treating water inflow or breakage of an extra-high voltage cable according to claim 1, wherein the method comprises the steps of: in the step S600, the humidity is set to be 10%, and the joint between the plug and the two ends of the cable is sealed and fixed by using a high-pressure self-adhesive tape and a throat hoop.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817395.9A CN115117799B (en) | 2022-07-12 | 2022-07-12 | Treatment method for water inflow or damage and damp of extra-high voltage cable |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210817395.9A CN115117799B (en) | 2022-07-12 | 2022-07-12 | Treatment method for water inflow or damage and damp of extra-high voltage cable |
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| Publication Number | Publication Date |
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| CN115117799A CN115117799A (en) | 2022-09-27 |
| CN115117799B true CN115117799B (en) | 2023-11-28 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202210817395.9A Active CN115117799B (en) | 2022-07-12 | 2022-07-12 | Treatment method for water inflow or damage and damp of extra-high voltage cable |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN116773437B (en) * | 2023-08-22 | 2023-11-03 | 成都汉度科技有限公司 | Electric power transmission line cable damage detection device |
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| CN107046253A (en) * | 2017-05-05 | 2017-08-15 | 王学峰 | Cable watered and wetting processing unit |
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| CN108023321A (en) * | 2017-12-14 | 2018-05-11 | 国网江苏省电力公司苏州供电公司 | Cable core dehumidification equipment |
| CN112467638A (en) * | 2020-10-10 | 2021-03-09 | 西北水利水电工程有限责任公司 | Method for rapidly repairing damage of buried cable |
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2022
- 2022-07-12 CN CN202210817395.9A patent/CN115117799B/en active Active
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104300421A (en) * | 2014-10-31 | 2015-01-21 | 天津市汇和电气设备有限公司 | Cable drainage device |
| CN104716599A (en) * | 2015-03-30 | 2015-06-17 | 中国矿业大学(北京) | Quick repairing technology for high voltage cable which enables water to enter and is affected with dampness |
| CN107046253A (en) * | 2017-05-05 | 2017-08-15 | 王学峰 | Cable watered and wetting processing unit |
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| CN107706837A (en) * | 2017-09-19 | 2018-02-16 | 浙江昌泰电力电缆有限公司 | A kind of below 500KV cross-linked polyethylene insulated cables transition joint making and repair novel construction skill |
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| CN115117799A (en) | 2022-09-27 |
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