CN115117799A - Method for treating water inflow or damage and damp of extra-high voltage cable - Google Patents
Method for treating water inflow or damage and damp of extra-high voltage cable Download PDFInfo
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- CN115117799A CN115117799A CN202210817395.9A CN202210817395A CN115117799A CN 115117799 A CN115117799 A CN 115117799A CN 202210817395 A CN202210817395 A CN 202210817395A CN 115117799 A CN115117799 A CN 115117799A
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- water inflow
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 45
- 238000000034 method Methods 0.000 title claims abstract description 33
- 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 13
- 238000001035 drying Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 5
- 238000004140 cleaning Methods 0.000 claims abstract description 4
- 239000007789 gas Substances 0.000 claims abstract description 3
- 239000002390 adhesive tape Substances 0.000 claims description 19
- 238000007789 sealing Methods 0.000 claims description 12
- 239000003063 flame retardant Substances 0.000 claims description 8
- 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 7
- 239000012535 impurity Substances 0.000 claims description 3
- 238000009413 insulation Methods 0.000 claims description 3
- 239000002699 waste material Substances 0.000 abstract description 3
- 230000008439 repair process Effects 0.000 description 5
- 238000004519 manufacturing process Methods 0.000 description 3
- 230000008901 benefit Effects 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 230000008569 process Effects 0.000 description 2
- 230000001105 regulatory effect Effects 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
- 238000005520 cutting process Methods 0.000 description 1
- 238000013016 damping Methods 0.000 description 1
- 230000007547 defect Effects 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
- 230000003993 interaction Effects 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000037303 wrinkles Effects 0.000 description 1
Images
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 and damp of an extra-high voltage cable, which comprises the following steps: step S100: inspecting the cable; step S200: lifting the first end of the cable to form a height difference 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-temperature-limiting electric tracing band; step S500: electrifying and heating the self-temperature-limiting electric tracing band, measuring the surface temperature of the cable by using a thermometer at set time intervals, and opening an adjusting valve of a nitrogen cylinder when the set temperature is reached, so as to keep the set pressure for continuous gas 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 an adjusting valve of the nitrogen cylinder when the nitrogen humidity is lower than the set humidity, immediately plugging two ends of the cable by using two plugs, and finishing drying. The method for treating the water inflow or the damage of the extra-high voltage cable to be damped carries out drying treatment on 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 and damp of an extra-high voltage cable.
Background
The extra-high voltage cable is a power cable appearing along with the continuous development of cable technology, belongs to a high-voltage cable with higher technical content, is generally used as a central link in a large-scale power transmission system, and takes the task of transmitting power generated by a power plant to a load center through a long-distance power transmission line or connecting the power plant into a power substation in a power grid, so that the power can bring great economic benefits to national production.
The extra-high voltage cable is complex in structure, high in process requirement, large and heavy in size, extremely high in production, transportation and laying requirements, and needs professional companies and teams to produce, install and lay, but outdoor environment is complex, accidents sometimes occur in the laying process, or the end is not sealed well when laying and installing, so that the cable is locally damaged, and water or water vapor enters the cable. After the cable is watered or affected with damp, the phenomenon of 'water tree aging' can occur under the action of an electromagnetic field, and finally the cable can be punctured and scrapped.
At present, the problem that an extra-high voltage cable is affected with water or damp does not have a good solution, a common treatment method is to make an intermediate joint or replace a whole cable, namely, the damp or water-affected part needs to be cut off, and then the cable is spliced by using the finished cable.
Disclosure of Invention
Based on the above problems, the invention aims to provide a method for treating water inflow or damaged and damped ultrahigh voltage cables, and the method can be used for solving the problems that the existing repair technology has defects and cannot effectively repair the cables after water inflow or internal damping.
In order to achieve the purpose, the invention adopts the following technical scheme:
a method for treating water inflow or damaged and damped ultrahigh voltage cables comprises the following steps:
step S100: inspecting the cable, wrapping and sealing the damaged part, and vertically or obliquely placing the cable to enable the water vapor in the cable to be freely discharged;
step S200: lifting the first end of the cable to form a height difference with the second end, and binding and fixing;
step S300: a sealing cap is hermetically arranged at the second end of the cable, a hose extends out of the sealing cap, the hose is connected to a nitrogen cylinder, and an adjusting valve is arranged at the outlet of the nitrogen cylinder;
step S400: cleaning the outer sheath and the wrapping part of the cable, ensuring the surface to be clean, smooth and free of foreign matters, and uniformly winding by adopting a self-temperature-limiting electric tracing band;
step S500: the self-temperature-limiting electric tracing band is electrified and heated, the surface temperature of the cable is measured by a thermometer at set time intervals, and when the set temperature is reached, an adjusting valve of a nitrogen cylinder is opened to keep set pressure for continuous gas 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 an adjusting valve of the nitrogen cylinder when the nitrogen humidity is lower than the set humidity, immediately plugging two ends of the cable by using two plugs, and finishing drying.
Further, in step S100, if the cable is damaged, the damaged portion is cleaned first to ensure that the outer sheath is smooth and flat, then a 15cm position on one side of the damaged point 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, the first point and the second point are lapped and wound by a high-pressure rubber insulation self-adhesive tape, then the third point and the fourth point are lapped and wound by a PVC electrical flame-retardant tape, and after two layers of winding are completed, whether a missing bag and a wrinkle exist is checked to ensure that the appearance is round and flawless.
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 from the first point clockwise, and then is uniformly wound to the first point from the second point anticlockwise; 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 a third point, and then is uniformly wound to the third point anticlockwise from the fourth point.
Further, the winding and capping rate was 50% ± 5%.
Further, in step S100, if the cable has a serious water inflow, the water inflow end is treated to ensure that the end has no impurities, the outer sheath with a length of about 5cm is cut off, the water inflow end is lower than the other end by about 1m, the water inflow end is laid flat after the water is free to run dry, and then the subsequent steps are performed.
Further, in step S200, the set value of the height difference is 1 m.
Further, in step S300, the joint between the cap and the second end of the cable is sealed and fixed by a high pressure self-adhesive tape and a hose clamp.
Further, in step S500, the time is set to 2min, the temperature is set to 80 ℃, and the pressure is set to 0.2 MPa.
Further, in step S600, the humidity is set to 10%, and the joints between the plugs and the two ends of the cable are sealed and fixed by high-pressure self-adhesive tapes and hose clamps.
In conclusion, the extra-high voltage cable water inlet or damage and damp treatment method has the advantages that the cable is dried according to the condition that the cable is damaged and damp or water is introduced, the method is different from the method for manufacturing the intermediate joint, the difference between the performance of the repair section and the performance of the 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 damaged and damped ultrahigh voltage cables according to an embodiment of the present invention.
Detailed Description
Reference will now be made in detail to the embodiments of the present invention, examples of which are illustrated in the accompanying drawings, wherein like or similar reference numerals refer to the same or similar parts throughout or parts having the same or similar functions. The embodiments described below with reference to the drawings are illustrative and intended to be illustrative of the invention and are not to be construed as limiting the invention.
In the description of the present invention, unless otherwise expressly specified or limited, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning a fixed connection, a removable connection, a mechanical connection, an electrical connection, a direct connection, an indirect connection via an intermediary, a connection between two elements, or an interaction between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
In the description of the present invention, unless otherwise expressly specified or limited, the first feature "on" or "under" the 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 being in contact not directly but with another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.
The technical scheme of the invention is further explained by the specific implementation mode in combination with the attached drawings.
Referring to fig. 1, the preferred embodiment provides a method for treating the water inflow or the damaged and damp condition of an extra-high voltage cable, which includes the following steps:
step S100: and inspecting the cable 1, wrapping and sealing the damaged part, and vertically or obliquely placing the cable 1 to freely discharge the internal water vapor.
It should be noted that the damage is affected by moisture and the water is supplied differently, and thus, it is necessary to distinguish between them.
If the cable 1 is damaged, firstly cleaning the damaged part to ensure that the outer sheath is smooth and flat, then setting a 15cm position on one side of the damaged point as a first point, setting a 15cm position on the other side of the damaged point as a second point, setting a 5cm position on the outer side of the first point as a third point, setting a 5cm position on the outer side of the second point as a fourth point, overlapping and winding the first point and the second point through a high-pressure rubber insulation self-adhesive tape, then overlapping and winding the third point and the fourth point through a PVC electrical flame-retardant tape, checking whether a bag is missed and a fold after the two layers of winding are finished, and ensuring that the appearance is round and flawless, wherein a half-overlapping mode is preferably adopted during winding, and the overlapping rate is 50 +/-5%.
Further, in order to ensure the sealing performance of the damaged part, when the high-pressure rubber insulating self-adhesive tape is wound, the high-pressure rubber insulating self-adhesive tape is uniformly wound to a second point from the first point clockwise, and then is uniformly wound to the first point from the second point anticlockwise; when twining PVC electrician's fire-retardant sticky tape, start clockwise even winding to fourth point from the third point earlier, start anticlockwise even winding by fourth point and return the third point, from this, fully guarantee the protectiveness of damaged department.
If the cable 1 has serious water inflow, firstly treating the water inflow end to ensure that the end has no impurities, cutting off the outer sheath with the length of about 5cm, keeping the water inflow end 1m lower than the other end, flatly placing the water inflow end after the water flows freely, and then carrying out the subsequent steps.
Step S200: the first end of the cable 1 is lifted to form a height difference with the second end, the set value of the height difference is preferably 1m, and the cable is bound and fixed.
Step S300: the second end of the cable 1 is provided with a sealing cap 2 in a sealing way, 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 3, the hose 3 is connected to a nitrogen cylinder 4, and the outlet of the nitrogen cylinder 4 is provided with an adjusting valve 5, so that nitrogen can be introduced into the cable 1 under stable pressure.
Step S400: the outer sheath and the wrapping part (especially the damp part) of the cable 1 are cleaned, the surface is ensured to be clean and smooth without foreign matters, and the self-temperature-limiting electric tracing band 6 is uniformly wound to ensure that the cable is tightly contacted with the cable and uniformly conducts heat.
Step S500: the self-temperature-limiting electric tracing band 6 is electrified and heated, the temperature of the surface of the cable 1 is measured by a thermometer 7 every 2min, when the temperature reaches more than 80 ℃, the regulating valve 5 of the nitrogen cylinder 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 a humidity detector 8, when the nitrogen humidity is lower than 10%, heating is stopped, a regulating valve 5 of a nitrogen cylinder 4 is closed, two plugs are used for immediately plugging two ends of the cable 1, and the joints of the plugs and the two ends of the cable 1 are sealed and fixed by high-pressure self-adhesive tapes and hose clamps.
From this, the drying process is accomplished, and the cable of intaking or weing is restoreed, can use once more, has avoided whole section to scrap.
In conclusion, the extra-high voltage cable water inlet or damage and damp treatment method is different from an intermediate joint in that the cable is dried under the condition that the cable is damaged and damp or water is fed, so that the difference between the performance of the repair section and the performance of the cable body is avoided, the cable is effectively repaired, and the energy waste is reduced.
The foregoing embodiments are merely illustrative of the principles and features of this invention, which is not limited to the above-described embodiments, but is capable of various modifications and changes without departing from the spirit and scope of the invention, which are intended to be within the scope of the appended claims. The scope of the invention is defined by the appended claims and equivalents thereof.
Claims (9)
1. A method for treating water inflow or damage and damp of an extra-high voltage cable is characterized by comprising
Step S100: inspecting the cable, wrapping and sealing the damaged part, and vertically or obliquely placing the cable to enable the water vapor in the cable to be freely discharged;
step S200: lifting the first end of the cable to form a height difference with the second end, and binding and fixing;
step S300: a sealing cap is hermetically arranged at the second end of the cable, a hose extends out of the sealing cap, the hose is connected to a nitrogen cylinder, and an adjusting valve is arranged at the outlet of the nitrogen cylinder;
step S400: cleaning the outer sheath and the wrapping part of the cable, ensuring the surface to be clean, smooth and free of foreign matters, and uniformly winding by adopting a self-temperature-limiting electric tracing band;
step S500: the self-temperature-limiting electric tracing band is electrified and heated, the surface temperature of the cable is measured by a thermometer at set time intervals, and when the set temperature is reached, an adjusting valve of a nitrogen cylinder is opened to keep set pressure for continuous gas 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 an adjusting valve of the nitrogen cylinder when the nitrogen humidity is lower than the set humidity, immediately plugging two ends of the cable by using two plugs, and finishing drying.
2. The method for treating extra-high voltage cable water inflow or damaged damp of claim 1, wherein the method comprises the following steps: in the step S100, if the cable is damaged, the damaged part is cleaned firstly to ensure that the outer sheath is smooth and flat, then a position 15cm away from one side of the damaged point is set as a first point, a position 15cm away from the other side of the damaged point is set as a second point, a position 5cm away from the first point is set as a third point, a position 5cm away from the second point is set as a fourth point, the first point and the second point are lapped and wound through a high-pressure rubber insulation self-adhesive tape, then the third point and the fourth point are lapped and wound through a PVC electric flame-retardant tape, and the condition that a missing bag and a fold exist after two layers of winding are checked is ensured, so that the appearance is round and flawless.
3. The method for treating extra-high voltage cable water inflow or damaged damp as claimed in claim 2, wherein: 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 from the first point clockwise, and then is uniformly wound to the first point from the second point anticlockwise; 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 a third point, and then is uniformly wound to the third point anticlockwise from the fourth point.
4. The method for treating extra-high voltage cable water inflow or damaged damp of claim 3, wherein the method comprises the following steps: the winding and covering rate is 50% +/-5%.
5. The method for treating extra-high voltage cable water inflow or damaged damp of claim 1, wherein the method comprises the following steps: in the step S100, if the water inflow of the cable is serious, the water inflow end is firstly treated to ensure that the end has no impurities, the outer sheath with the length of about 5cm is cut off, the water inflow end is about 1m lower than the other end, the water inflow end is laid flat after the water flows freely, and then the subsequent steps are carried out.
6. The method for treating extra-high voltage cable water inflow or damaged damp of claim 1, wherein the method comprises the following steps: in step S200, the set value of the height difference is 1 m.
7. The method for treating the inflow water or the breakage of the extra-high voltage cable to be damped according to claim 1, wherein the method comprises the following steps: in step S300, the joint between the sealing cap and the second end of the cable is sealed and fixed by a high pressure self-adhesive tape and a hose clamp.
8. The method for treating extra-high voltage cable water inflow or damaged damp of claim 1, wherein the method comprises the following steps: in step S500, the time is set to 2min, the temperature is set to 80 ℃, and the pressure is set to 0.2 MPa.
9. The method for treating extra-high voltage cable water inflow or damaged damp of claim 1, wherein the method comprises the following steps: in step S600, the humidity is set to 10%, and the joints between the plugs and the two ends of the cable are sealed and fixed by high-pressure self-adhesive tapes and hose clamps.
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 |
Applications Claiming Priority (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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| Publication Number | Publication Date |
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| CN115117799A true CN115117799A (en) | 2022-09-27 |
| CN115117799B 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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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773437A (en) * | 2023-08-22 | 2023-09-19 | 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 |
| 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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| 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 |
| CN207199347U (en) * | 2017-07-27 | 2018-04-06 | 中建安装工程有限公司 | Power cable dehumidifying system |
| 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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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN116773437A (en) * | 2023-08-22 | 2023-09-19 | 成都汉度科技有限公司 | Electric power transmission line cable damage detection device |
| 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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| Publication number | Publication date |
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| CN115117799B (en) | 2023-11-28 |
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