CN116640447A - Preparation and application of cable targeting repair liquid for inhibiting ultraviolet degradation and resisting electric damage - Google Patents
Preparation and application of cable targeting repair liquid for inhibiting ultraviolet degradation and resisting electric damage Download PDFInfo
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- CN116640447A CN116640447A CN202310606111.6A CN202310606111A CN116640447A CN 116640447 A CN116640447 A CN 116640447A CN 202310606111 A CN202310606111 A CN 202310606111A CN 116640447 A CN116640447 A CN 116640447A
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- 230000008439 repair process Effects 0.000 title claims abstract description 97
- 239000007788 liquid Substances 0.000 title claims abstract description 85
- 230000008685 targeting Effects 0.000 title claims abstract description 35
- 230000015556 catabolic process Effects 0.000 title claims abstract description 34
- 238000006731 degradation reaction Methods 0.000 title claims abstract description 33
- 230000002401 inhibitory effect Effects 0.000 title claims abstract description 29
- 230000006378 damage Effects 0.000 title claims abstract description 25
- 238000002360 preparation method Methods 0.000 title description 9
- 240000005572 Syzygium cordatum Species 0.000 claims abstract description 39
- 235000006650 Syzygium cordatum Nutrition 0.000 claims abstract description 39
- 239000006097 ultraviolet radiation absorber Substances 0.000 claims abstract description 32
- 238000000034 method Methods 0.000 claims abstract description 24
- 238000009413 insulation Methods 0.000 claims abstract description 22
- 239000003054 catalyst Substances 0.000 claims abstract description 18
- KPUWHANPEXNPJT-UHFFFAOYSA-N disiloxane Chemical class [SiH3]O[SiH3] KPUWHANPEXNPJT-UHFFFAOYSA-N 0.000 claims abstract description 18
- 239000000411 inducer Substances 0.000 claims abstract description 17
- VXUYXOFXAQZZMF-UHFFFAOYSA-N titanium(IV) isopropoxide Chemical compound CC(C)O[Ti](OC(C)C)(OC(C)C)OC(C)C VXUYXOFXAQZZMF-UHFFFAOYSA-N 0.000 claims description 18
- 230000032683 aging Effects 0.000 claims description 14
- 208000013935 Electric injury Diseases 0.000 claims description 12
- 238000002156 mixing Methods 0.000 claims description 12
- 238000003756 stirring Methods 0.000 claims description 12
- 239000011261 inert gas Substances 0.000 claims description 11
- KWYUFKZDYYNOTN-UHFFFAOYSA-M Potassium hydroxide Chemical compound [OH-].[K+] KWYUFKZDYYNOTN-UHFFFAOYSA-M 0.000 claims description 9
- QRUDEWIWKLJBPS-UHFFFAOYSA-N benzotriazole Chemical compound C1=CC=C2N[N][N]C2=C1 QRUDEWIWKLJBPS-UHFFFAOYSA-N 0.000 claims description 8
- 239000012964 benzotriazole Substances 0.000 claims description 8
- 238000011049 filling Methods 0.000 claims description 7
- NIZBFFOETCKGBI-UHFFFAOYSA-N 1-hydroxy-2,2,3,3,4-pentamethylpiperidine Chemical compound CC1CCN(O)C(C)(C)C1(C)C NIZBFFOETCKGBI-UHFFFAOYSA-N 0.000 claims description 6
- RKMGAJGJIURJSJ-UHFFFAOYSA-N 2,2,6,6-Tetramethylpiperidine Substances CC1(C)CCCC(C)(C)N1 RKMGAJGJIURJSJ-UHFFFAOYSA-N 0.000 claims description 6
- VEXZGXHMUGYJMC-UHFFFAOYSA-N Hydrochloric acid Chemical compound Cl VEXZGXHMUGYJMC-UHFFFAOYSA-N 0.000 claims description 6
- CVQVSVBUMVSJES-UHFFFAOYSA-N dimethoxy-methyl-phenylsilane Chemical group CO[Si](C)(OC)C1=CC=CC=C1 CVQVSVBUMVSJES-UHFFFAOYSA-N 0.000 claims description 6
- GNOIPBMMFNIUFM-UHFFFAOYSA-N hexamethylphosphoric triamide Chemical compound CN(C)P(=O)(N(C)C)N(C)C GNOIPBMMFNIUFM-UHFFFAOYSA-N 0.000 claims description 6
- JMXKSZRRTHPKDL-UHFFFAOYSA-N titanium ethoxide Chemical compound [Ti+4].CC[O-].CC[O-].CC[O-].CC[O-] JMXKSZRRTHPKDL-UHFFFAOYSA-N 0.000 claims description 6
- ZXDDPOHVAMWLBH-UHFFFAOYSA-N 2,4-Dihydroxybenzophenone Chemical compound OC1=CC(O)=CC=C1C(=O)C1=CC=CC=C1 ZXDDPOHVAMWLBH-UHFFFAOYSA-N 0.000 claims description 4
- DXGLGDHPHMLXJC-UHFFFAOYSA-N oxybenzone Chemical compound OC1=CC(OC)=CC=C1C(=O)C1=CC=CC=C1 DXGLGDHPHMLXJC-UHFFFAOYSA-N 0.000 claims description 4
- FPCJKVGGYOAWIZ-UHFFFAOYSA-N butan-1-ol;titanium Chemical compound [Ti].CCCCO.CCCCO.CCCCO.CCCCO FPCJKVGGYOAWIZ-UHFFFAOYSA-N 0.000 claims description 3
- ZEIWWVGGEOHESL-UHFFFAOYSA-N methanol;titanium Chemical compound [Ti].OC.OC.OC.OC ZEIWWVGGEOHESL-UHFFFAOYSA-N 0.000 claims description 3
- 238000007599 discharging Methods 0.000 claims description 2
- 230000000977 initiatory effect Effects 0.000 abstract description 30
- 230000009471 action Effects 0.000 abstract description 13
- 230000007547 defect Effects 0.000 abstract description 13
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- 230000005012 migration Effects 0.000 abstract description 8
- 238000013508 migration Methods 0.000 abstract description 8
- 230000007774 longterm Effects 0.000 abstract description 6
- 230000005684 electric field Effects 0.000 abstract description 5
- 238000004720 dielectrophoresis Methods 0.000 abstract description 4
- 238000011031 large-scale manufacturing process Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 4
- 229940124543 ultraviolet light absorber Drugs 0.000 abstract description 4
- 238000013329 compounding Methods 0.000 abstract description 3
- 238000005516 engineering process Methods 0.000 abstract description 3
- 238000011161 development Methods 0.000 abstract description 2
- 230000000694 effects Effects 0.000 description 14
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 12
- 238000001782 photodegradation Methods 0.000 description 11
- 229920003020 cross-linked polyethylene Polymers 0.000 description 10
- 239000004703 cross-linked polyethylene Substances 0.000 description 10
- 229920000642 polymer Polymers 0.000 description 8
- 238000006243 chemical reaction Methods 0.000 description 7
- 101001047746 Homo sapiens Lamina-associated polypeptide 2, isoform alpha Proteins 0.000 description 6
- 101001047731 Homo sapiens Lamina-associated polypeptide 2, isoforms beta/gamma Proteins 0.000 description 6
- 102100023981 Lamina-associated polypeptide 2, isoform alpha Human genes 0.000 description 6
- 230000005764 inhibitory process Effects 0.000 description 6
- 229910052757 nitrogen Inorganic materials 0.000 description 6
- 150000003254 radicals Chemical class 0.000 description 6
- WVLBCYQITXONBZ-UHFFFAOYSA-N trimethyl phosphate Chemical compound COP(=O)(OC)OC WVLBCYQITXONBZ-UHFFFAOYSA-N 0.000 description 6
- 238000002474 experimental method Methods 0.000 description 5
- 238000000605 extraction Methods 0.000 description 5
- 238000002347 injection Methods 0.000 description 5
- 239000007924 injection Substances 0.000 description 5
- 238000012986 modification Methods 0.000 description 5
- 230000004048 modification Effects 0.000 description 5
- 239000000203 mixture Substances 0.000 description 4
- VYKNVAHOUNIVTQ-UHFFFAOYSA-N 1,2,2,3,3-pentamethylpiperidine Chemical compound CN1CCCC(C)(C)C1(C)C VYKNVAHOUNIVTQ-UHFFFAOYSA-N 0.000 description 3
- YAXWOADCWUUUNX-UHFFFAOYSA-N 1,2,2,3-tetramethylpiperidine Chemical group CC1CCCN(C)C1(C)C YAXWOADCWUUUNX-UHFFFAOYSA-N 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 3
- 238000004458 analytical method Methods 0.000 description 3
- 230000000052 comparative effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000005284 excitation Effects 0.000 description 3
- 239000012530 fluid Substances 0.000 description 3
- 239000011159 matrix material Substances 0.000 description 3
- 229920001296 polysiloxane Polymers 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 2
- AVXURJPOCDRRFD-UHFFFAOYSA-N Hydroxylamine Chemical class ON AVXURJPOCDRRFD-UHFFFAOYSA-N 0.000 description 2
- 239000006096 absorbing agent Substances 0.000 description 2
- 230000005540 biological transmission Effects 0.000 description 2
- 239000004020 conductor Substances 0.000 description 2
- 239000010949 copper Substances 0.000 description 2
- 229910052802 copper Inorganic materials 0.000 description 2
- 238000009826 distribution Methods 0.000 description 2
- 230000000670 limiting effect Effects 0.000 description 2
- 239000012466 permeate Substances 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 239000003381 stabilizer Substances 0.000 description 2
- 238000006467 substitution reaction Methods 0.000 description 2
- 238000003878 thermal aging Methods 0.000 description 2
- PCTMTFRHKVHKIS-BMFZQQSSSA-N (1s,3r,4e,6e,8e,10e,12e,14e,16e,18s,19r,20r,21s,25r,27r,30r,31r,33s,35r,37s,38r)-3-[(2r,3s,4s,5s,6r)-4-amino-3,5-dihydroxy-6-methyloxan-2-yl]oxy-19,25,27,30,31,33,35,37-octahydroxy-18,20,21-trimethyl-23-oxo-22,39-dioxabicyclo[33.3.1]nonatriaconta-4,6,8,10 Chemical compound C1C=C2C[C@@H](OS(O)(=O)=O)CC[C@]2(C)[C@@H]2[C@@H]1[C@@H]1CC[C@H]([C@H](C)CCCC(C)C)[C@@]1(C)CC2.O[C@H]1[C@@H](N)[C@H](O)[C@@H](C)O[C@H]1O[C@H]1/C=C/C=C/C=C/C=C/C=C/C=C/C=C/[C@H](C)[C@@H](O)[C@@H](C)[C@H](C)OC(=O)C[C@H](O)C[C@H](O)CC[C@@H](O)[C@H](O)C[C@H](O)C[C@](O)(C[C@H](O)[C@H]2C(O)=O)O[C@H]2C1 PCTMTFRHKVHKIS-BMFZQQSSSA-N 0.000 description 1
- 229910000831 Steel Inorganic materials 0.000 description 1
- 239000002250 absorbent Substances 0.000 description 1
- 230000002745 absorbent Effects 0.000 description 1
- 239000000654 additive Substances 0.000 description 1
- 230000000996 additive effect Effects 0.000 description 1
- 239000000853 adhesive Substances 0.000 description 1
- 230000001070 adhesive effect Effects 0.000 description 1
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 description 1
- 229910052782 aluminium Inorganic materials 0.000 description 1
- 230000003064 anti-oxidating effect Effects 0.000 description 1
- 239000003963 antioxidant agent Substances 0.000 description 1
- 230000003078 antioxidant effect Effects 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000006482 condensation reaction Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 239000011810 insulating material Substances 0.000 description 1
- 230000001788 irregular Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- DOTMOQHOJINYBL-UHFFFAOYSA-N molecular nitrogen;molecular oxygen Chemical compound N#N.O=O DOTMOQHOJINYBL-UHFFFAOYSA-N 0.000 description 1
- 239000002105 nanoparticle Substances 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 230000036961 partial effect Effects 0.000 description 1
- 238000010248 power generation Methods 0.000 description 1
- 230000000191 radiation effect Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 239000004065 semiconductor Substances 0.000 description 1
- 239000000243 solution Substances 0.000 description 1
- 239000010959 steel Substances 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/04—Oxygen-containing compounds
- C08K5/13—Phenols; Phenolates
- C08K5/132—Phenols containing keto groups, e.g. benzophenones
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3412—Heterocyclic compounds having nitrogen in the ring having one nitrogen atom in the ring
- C08K5/3432—Six-membered rings
- C08K5/3435—Piperidines
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08K—Use of inorganic or non-macromolecular organic substances as compounding ingredients
- C08K5/00—Use of organic ingredients
- C08K5/16—Nitrogen-containing compounds
- C08K5/34—Heterocyclic compounds having nitrogen in the ring
- C08K5/3467—Heterocyclic compounds having nitrogen in the ring having more than two nitrogen atoms in the ring
- C08K5/3472—Five-membered rings
- C08K5/3475—Five-membered rings condensed with carbocyclic rings
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B3/00—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties
- H01B3/18—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances
- H01B3/30—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes
- H01B3/46—Insulators or insulating bodies characterised by the insulating materials; Selection of materials for their insulating or dielectric properties mainly consisting of organic substances plastics; resins; waxes silicones
-
- 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
-
- C—CHEMISTRY; METALLURGY
- C08—ORGANIC MACROMOLECULAR COMPOUNDS; THEIR PREPARATION OR CHEMICAL WORKING-UP; COMPOSITIONS BASED THEREON
- C08L—COMPOSITIONS OF MACROMOLECULAR COMPOUNDS
- C08L2203/00—Applications
- C08L2203/20—Applications use in electrical or conductive gadgets
- C08L2203/202—Applications use in electrical or conductive gadgets use in electrical wires or wirecoating
-
- 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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- Chemical & Material Sciences (AREA)
- Health & Medical Sciences (AREA)
- Chemical Kinetics & Catalysis (AREA)
- Medicinal Chemistry (AREA)
- Polymers & Plastics (AREA)
- Organic Chemistry (AREA)
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Insulated Conductors (AREA)
Abstract
The invention relates to a cable targeting repair liquid for inhibiting ultraviolet degradation and resisting electric damage, which comprises the following components in parts by weight: 88.5 to 99.5 portions of siloxane; 0.3 to 5.5 portions of catalyst; 0.5 to 6 portions of targeted inducer; 0.2 to 6.0 portions of ultraviolet absorber. The invention has the advantages that the ultraviolet light absorber which can inhibit ultraviolet light degradation is utilized to improve the cable insulation repair liquid, and ultraviolet light generated in the compounding process is absorbed or inhibited, so that insulation electric damage is inhibited, the electric resistance of the cable is improved, the service life of the aged cable is prolonged, and the technology has wide development space and economic and social values; the polar molecules in the repairing liquid are subjected to targeted migration towards the defect under the action of dielectrophoresis force under the action of an electric field, so that the problem of insufficient liquid concentration at the defect position caused by migration and consumption of the repairing liquid is solved, the long-term effect in water tree repairing is improved, the capability of insulating and inhibiting secondary electric tree initiation in electric tree and water tree areas is further improved, the cost is low, the repeatability is good, and the repairing liquid can be used for large-scale production and application.
Description
Technical Field
The invention relates to the technical field of cable repair, in particular to preparation and application of cable targeted repair liquid for resisting electric damage for inhibiting ultraviolet degradation.
Background
The reliability of operation of the power cable, which is an indispensable important part of the transmission line, plays a decisive role in the stability and safety of the entire power system. At present, cross-linked polyethylene (XLPE) power cables with good electrical and mechanical properties are mostly adopted in power cable systems. However, many crosslinked polyethylene cabling has been run for up to 20 years and has gradually entered failure high-rise. Because of the problems of imprecise manufacturing process, irregular installation and laying of the early cable, the cross-linked polyethylene cable has serious water tree problem in the operation process. Under the action of lightning and impulse voltage, the tip of the water tree is easy to lead the power generation tree. Once the electric tree is started, partial discharge can be generated in a short period, and finally insulation breakdown is caused, so that power failure accidents are caused.
In order to ensure that the transmission line can safely run, if the cable with serious insulation problem is integrally replaced, huge manpower, material resources and financial resources are consumed, and the cable is unacceptable to power grid companies with improved power system, reduced cost and increased efficiency. And the insulation repair is carried out on the cable, so that the repair enhancement on the insulation of the aged cable line can be realized under the condition of lower cost, the service life of the aged cable line is prolonged, and the aged cable line has great economic and social values. The basic principle of the current repair technology is that the siloxane repair liquid is permeated into cable insulation by utilizing pressure, hydrolysis-condensation reaction is carried out simultaneously, water in the insulation is consumed, and organic polymer with dielectric property similar to crosslinked polyethylene is produced by reaction, so that insulation defect is filled and insulation repair is realized. Meanwhile, the repairing effect can be improved by properly adding assistants such as a voltage stabilizer, an antioxidant, inorganic nano particles and the like into the repairing liquid.
It has been shown that electrons injected into the insulation in the negative half cycle of the ac voltage recombine with holes injected in the positive half cycle and radiate photons and produce ultraviolet light, causing photodegradation reaction, which causes rapid degradation of the polymer. At this time, if moisture intrudes or defects in the polymer due to photodegradation are caused by overvoltage, they become initiation points of electrical damage (water tree or electric tree). Practice shows that the long-term repair effect in the power cable repair liquid in the prior art is not ideal enough, and a new generation of power cable targeting repair liquid with better long-term repair effect needs to be developed, so that the electric tree initiation and secondary initiation in a water tree area can be inhibited while the repair cable is insulated.
In the existing repair liquid formula for inhibiting the initiation of the electric tree, a voltage stabilizer with high-energy electron capturing effect and antioxidation effect is mainly added. However, under the action of the electric field, the charge injection-extraction and the charge trapping-detrapping processes at the defect generate radiation effect due to charge recombination, so that photons are generated. These photons attack the XLPE molecular chain, causing the molecular chain to break, which becomes the initiation point for electrical damage. Therefore, the ultraviolet light absorber with the effect of inhibiting ultraviolet light degradation and the additive with the effect of targeted induction are utilized to improve the cable insulation repair liquid, and the insulation defect is accurately repaired, and simultaneously, the ultraviolet light generated in the compounding process is absorbed or inhibited, so that the insulation electric damage is inhibited, the electrical resistance of the cable is improved, and the service life of the aged cable is prolonged.
Disclosure of Invention
Aiming at the defects existing in the prior art, the invention provides a cable targeting repair liquid for inhibiting ultraviolet degradation and resisting electric damage, which comprises the following components in parts by weight:
88.5 to 99.5 portions of siloxane; 0.3 to 5.5 portions of catalyst; 0.5 to 6 portions of targeted inducer; 0.2 to 6.0 portions of ultraviolet absorber.
Further, the components are as follows: 94.3 to 98.6 portions of siloxane; 0.8-2.7 parts of catalyst; 0.8 to 2.5 portions of targeted inducer; 0.6 to 3.0 portions of ultraviolet absorber.
Further, the components are as follows: 92-99.5 parts of siloxane; 0.3 to 5.0 portions of catalyst; 0.5 to 2.2 portions of targeted inducer; 0.2 to 3 portions of ultraviolet absorber.
Specifically, the ultraviolet absorber can absorb ultraviolet light wave bands which cause the breakage of insulating molecules, and block the chain reaction of photodegradation, so that electric tree initiation in XLPE and secondary initiation in a water tree area are inhibited, and the electric tree initiation voltage is obviously increased.
Further, the catalyst is at least one of titanium isopropoxide, titanium ethoxide, titanium isopropoxide, titanium n-butoxide, titanium methoxide, tetraisopropyl titanate, potassium hydroxide and hydrochloric acid.
Further, the targeting inducer is at least one of 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone and hexamethylphosphoric triamide.
Further, the ultraviolet absorber is at least one of benzotriazole ultraviolet absorber, pentamethylpiperidinol, 4-benzoyloxy-2, 6-tetramethylpiperidine and hexamethylphosphoric triamide.
Specifically, the pentamethylpiperidine alcohol functional structural unit is tetramethylpiperidine, and is oxidized into nitroxide free radical TMPO under the excitation of photoelectrons, so that the free radical R generated by photodegradation of the polymer can be captured, TMPO.R is generated to block the generation of ROO and ROOH, and photodegradation chain reaction is inhibited. The benzotriazole ultraviolet absorber can absorb ultraviolet radiation with the wavelength ranging from 290 nm to 400nm, converts absorbed photon energy into vibration energy to be released, reduces the attack of photons on matrix molecular chains, has the capacity of being capable of capturing high-energy electrons generated by charge injection and extraction in insulation and reducing the influence on the molecular chains, reduces the low-density area of a polymer, and effectively inhibits the initiation and growth of electric trees in the areas of electric trees and water trees.
Further, the siloxane is methyl phenyl dimethoxy silane.
The cable targeted repair liquid for resisting electric damage, disclosed by the invention, has the advantages that the ultraviolet light absorber for inhibiting ultraviolet light degradation is utilized to improve the cable insulation repair liquid, and ultraviolet light generated in the compounding process is absorbed or inhibited, so that the insulation electric damage is inhibited, the electric resistance of the cable is improved, the service life of the aged cable is prolonged, and the technology has wide development space and economic and social values; the polar molecules in the repairing liquid are subjected to targeted migration towards the defect under the action of dielectrophoresis force under the action of an electric field, so that the problem of insufficient liquid concentration at the defect position caused by migration and consumption of the repairing liquid is solved, the long-term effect in water tree repairing is improved, the capability of insulating and inhibiting secondary electric tree initiation in electric tree and water tree areas is further improved, the cost is low, the repeatability is good, and the repairing liquid can be used for large-scale production and application.
The second aspect of the present invention also discloses a preparation method of the cable targeting repair liquid for resisting electric damage for inhibiting ultraviolet degradation, comprising the following steps:
step one, adding a preset weight part of siloxane, a catalyst, a targeting inducer and an ultraviolet absorber into a mixing container for mixing;
and step two, introducing inert gas into the mixing container, stirring for a preset period of time in a room temperature shading environment, and preserving in the room temperature environment after stirring is finished to obtain the cable targeting repair liquid.
Further, in the second step, the preset time is not less than 30min.
Further, the inert gas is nitrogen.
The preparation method disclosed by the invention has the advantages that: the preparation process is simple, the operation is simple and convenient, the economy is good, and the applicability is strong.
The invention in a third aspect discloses an application method of cable targeting repair liquid for resisting electric damage for inhibiting ultraviolet degradation, which comprises the following steps:
firstly, constructing a repair system, removing terminal heads at two ends of a power cable to be repaired after equipment is inspected and debugged, and respectively installing a front-end adapter and a rear-end adapter;
step two, detecting the penetrability, wherein a front end valve of a front end adapter is connected with an air compressor, inert gas is injected into a cable to be repaired by using the air compressor, and the penetrability is detected by using a barometer;
step three, filling repair liquid into the cable to be repaired, dismantling the air compressor, connecting the repair equipment, adjusting the pressure to enable the repair liquid to be filled into the cable core of the cable to be repaired from the front-end adapter, stopping filling after the repair liquid overflows from the rear-end valve of the rear-end adapter, closing the rear-end valve, and keeping constant pressure for a preset period of time;
and fourthly, closing the front end valve and keeping the closing state of the rear end valve by the insulating layer of the cable to be repaired, applying voltage, standing for a preset period of time, enabling the repairing liquid to fully infiltrate into the cable insulation, fully reacting with moisture in the aging area of the water tree, filling the water tree channel and the micropores, closing the voltage after repairing, opening the front end valve and the rear end valve, discharging residual liquid, and finishing repairing.
Further, in the second step, the inert gas is nitrogen.
Further, in the second step, the pressure of the inert gas is 0.1-0.3 MPa.
Further, in the third step, the pressure is 0.1-0.4 MPa.
Further, in the third step, the preset time of the constant pressure is 4-6 hours.
Further, in the fourth step, the method for applying the voltage is as follows: a positive 2kV dc voltage was applied to the cable core using a voltage generator.
In summary, the application method of the cable targeting repair liquid for resisting electric injury disclosed by the invention for inhibiting ultraviolet degradation has the beneficial technical effects that: the polar molecules in the repair liquid are subjected to targeted migration towards the defect under the action of dielectrophoresis force under the action of an electric field, so that the problem of insufficient liquid concentration at the defect position caused by migration and consumption of the repair liquid is solved, the long-term effect in water tree repair is improved, the capability of insulating and inhibiting secondary electric tree initiation in the electric tree and water tree area is further improved, and the device is simple in application, low in cost and good in repeatability, and can be used for large-scale production and application.
Drawings
The above and other objects, features and advantages of the present invention will become more apparent from the following detailed description of embodiments of the present invention with reference to the accompanying drawings. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention.
FIG. 1 is a schematic diagram of a cross-linked polyethylene power cable injection repair device;
FIG. 2 is a schematic diagram of a polymer photodegradation process;
FIG. 3 is a Weibull plot of the electrical tree initiation voltage for an aged cable sample;
FIG. 4 is a graph of Weibull plots of electrical tree initiation voltages for four sets of water tree aged cable samples
In the figure, 1, front end valve, 2, front end adapter, 3, power cable, 4, back end adapter, 5, back end valve.
Detailed Description
The following description is of the preferred embodiments of the present invention, and it should be noted that it will be apparent to those skilled in the art that various changes and modifications can be made without departing from the principle of the invention, and these changes and modifications are also considered to be the scope of the invention.
The cable targeting repair liquid for inhibiting ultraviolet degradation and resisting electric damage disclosed by the embodiment of the invention comprises the following components in parts by weight: 88.5 to 99.5 portions of siloxane; 0.3 to 5.5 portions of catalyst; 0.5 to 6 portions of targeted inducer; 0.2 to 6.0 portions of ultraviolet absorber.
Further, the components are as follows: 94.3 to 98.6 portions of siloxane; 0.8-2.7 parts of catalyst; 0.8 to 2.5 portions of targeted inducer; 0.6 to 3.0 portions of ultraviolet absorber.
Further, the components are as follows: 92-99.5 parts of siloxane; 0.3 to 5.0 portions of catalyst; 0.5 to 2.2 portions of targeted inducer; 0.2 to 3 portions of ultraviolet absorber.
Further, the catalyst is at least one of titanium isopropoxide, titanium ethoxide, titanium isopropoxide, titanium n-butoxide, titanium methoxide, tetraisopropyl titanate, potassium hydroxide and hydrochloric acid.
Further, the targeting inducer is at least one of 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone and hexamethylphosphoric triamide.
Further, the ultraviolet absorber is at least one of benzotriazole ultraviolet absorber, pentamethylpiperidinol, 4-benzoyloxy-2, 6-tetramethylpiperidine and hexamethylphosphoric triamide.
Further, the siloxane is methyl phenyl dimethoxy silane.
The preferred embodiment of the preparation method of the cable targeting repair liquid for resisting electric injury, which is used for inhibiting ultraviolet degradation, is as follows.
Example 1
Preparation and application of cable targeting repair liquid for resisting electric injury with ultraviolet degradation inhibition function are prepared according to the following method: 98.0 parts of methyl phenyl dimethoxy silane (with the concentration of 98.0 wt%), 1.0 parts of titanium ethoxide catalyst (with the concentration of 1.0 wt%), 1.0 parts of 2-hydroxy-4-methoxybenzophenone (with the concentration of 1.0 wt%), and 1.0 parts of benzotriazole ultraviolet absorber (with the concentration of 1.0 wt%) are added into a mixing container equipped with a stirring device, nitrogen inert gas is introduced into the mixing container, the mixture is stirred at room temperature for at least 30 minutes, and after the stirring is finished, the mixture is stored in the room temperature environment, so that the cable targeting repair liquid for resisting electric damage with ultraviolet degradation inhibition can be obtained. The benzotriazole ultraviolet absorber can absorb ultraviolet radiation with the wavelength range of 290-400nm, convert absorbed photon energy into vibration energy and release the vibration energy, and reduce the attack of photons on matrix molecular chains; in addition, the insulating material has an electrophilic capability, and can capture high-energy electrons generated by charge injection and extraction in insulation, so that the influence on molecular chains is reduced.
Example 2
The cable targeting repair liquid for resisting electric injury with the function of inhibiting ultraviolet degradation is prepared by the following steps: 98.0 parts of methyl phenyl dimethoxy silane (with the concentration of 98.0 wt%), 1.0 parts of titanium ethoxide catalyst (with the concentration of 1.0 wt%), 1.0 parts of 2, 4-dihydroxybenzophenone (with the concentration of 1.0 wt%), and 1.0 parts of pentamethylpiperidinol (with the concentration of 1.0 wt%) are added into a mixing container equipped with a stirring device, nitrogen inert gas is introduced into the mixing container, stirring is carried out for 30 minutes at room temperature, and after the stirring is finished, the cable targeting repair liquid for resisting electric damage with ultraviolet degradation can be obtained after the stirring is preserved in the room temperature environment. Wherein the pentamethylpiperidine alcohol functional structural unit is tetramethylpiperidine, and is oxidized into nitroxide free radical TMPO under the excitation of photoelectrons, which can capture free radical R.generated by photodegradation of polymer, generate TMPO.R to block ROO.and ROOH, and inhibit photodegradation chain reaction.
Comparative example 1
A siloxane repair liquid without a targeting inducer and an ultraviolet absorber is prepared by the following method: 99.0 parts of methyl phenyl dimethoxy silane (with the concentration of 98.0 wt%) and 1.0 parts of titanium ethoxide catalyst (with the concentration of 1.0 wt%) are added into a mixing container equipped with a stirring device, nitrogen inert gas is introduced into the mixing container, the mixture is stirred at room temperature for at least 30 minutes, and after the stirring is finished, the mixture is preserved in the room temperature environment, so that the siloxane repair liquid without the ultraviolet absorbent is obtained.
Examples of application of the above-disclosed examples 1, 2 and comparative example 1 to obtain a repair liquid are as follows
1. Subject acquisition
In order to study the repair effect of the cable targeting repair liquid for resisting electric damage, which is provided by the invention and can inhibit ultraviolet degradation, a cable with the standard of 95mm is selected 2 8.7/10kV XLPE cable of aluminum conductor is cut into 8 samples 400mm long and divided into 4 groups, numbered A (2), B (2), C (2) and D (2). One end of the sample was cut to obtain 10mm long exposed conductors. To avoid creeping discharge, the end 100mm outer semiconductor layer is removed. The samples were subjected to water tree aging and thermal aging, respectively. Wherein the amplitude of the alternating voltage applied by the water tree aging is 7.5kV, the frequency is 400Hz, and the aging time is 30 days. The heat aging temperature is 150 ℃ and the aging time is 144 hours. And obtaining each group of water tree aging and heat aging cable samples.
The aged cable samples (water tree aging and thermal aging) obtained were divided into four groups ABCD for performing electrical tree initiation experiments, corresponding to the following sample fluids, respectively:
group A, is used for injecting the sample liquid without repairing liquid;
group B, silicone repair fluid injected into comparative example 1 without targeting inducer and uv absorber; group C, cable targeting repair liquid for resisting electric injury with ultraviolet degradation inhibition function in the embodiment 1 of the invention;
group D, cable-targeted repair liquid with ultraviolet light inhibition effect for electric injury resistance in example 2.
2. Repair of aged cable samples
The silicone repair fluid prepared in example 1 and containing no uv absorber was injected into group B samples as follows, specifically comprising the following steps (see fig. 1):
firstly, constructing a repair system, removing terminal heads at two ends of a power cable (3) to be repaired after equipment is inspected and debugged, and respectively installing a front-end adapter (2) and a rear-end adapter (4);
step two, detecting penetrability: the front end valve (1) of the front end adapter (2) is connected with an air compressor, nitrogen inert gas of 0.1-0.3 MPa is injected into the cable to be repaired by the air compressor, and the connectivity is detected by a barometer;
thirdly, injecting repair liquid, removing an air compressor connected with the front-end valve (1), connecting repair equipment, adjusting the pressure to be 0.1-0.4 MPa, injecting the repair liquid into the cable core of the electric cable to be repaired from the front-end adapter (2), stopping filling the repair liquid after the repair liquid overflows from the rear-end valve (5) of the rear-end adapter (4), closing the rear-end valve (5), and keeping the constant pressure for 4-6 hours, so that the repair liquid fully permeates the insulating layer of the cable to be repaired;
repairing an insulating layer, closing a front end valve (1), keeping a rear end valve (5) in a closed state, applying a direct-current voltage of positive 2kV on a cable core by using a voltage generator, standing for 72 hours, so that repair liquid fully permeates into cable insulation, fully reacts with moisture in an aging area of a water tree, and fills a water tree channel and micropores; after the repair is finished, the voltage generator is closed, the front end valve (1) and the rear end valve (5) are opened, the residual liquid is discharged, and the repair is finished.
By the same method as above, a silicone repair liquid containing no ultraviolet absorber was injected into the group B heat-aged samples.
The cable targeted repair liquid for electric damage with ultraviolet degradation inhibition in example 1 was injected into the group C samples (water tree, heat aging) by the same method as described above; the same method was used to inject the cable-targeted repair solution with ultraviolet light inhibition for electric damage resistance in example 2 into group D samples (water tree, heat aging).
3. Test analysis of repair results
(1) Electrical tree initiation experiments for thermally aged cables
A sector specimen having a thickness of 4.5mm was cut out for each of the four A, B, C, D groups of heat-aged cable samples, and a copper tape having a width of 4.5mm was attached to the samples with a conductive adhesive as a ground electrode. A steel needle having a diameter of 1mm and a tip radius of 10.+ -. 2 μm was vertically inserted into each sample from the side of the insulating layer so that the tip was spaced 2.+ -. 0.1mm from the ground electrode as an observation area for the electrical tree. The sample was placed in a vessel containing transformer oil to avoid flashover. Wherein the needle electrode is connected to the high voltage side and the copper strap is grounded. The electric tree initiation experiment was performed using a constant speed 500V/s boost method. The experimental results are shown in FIG. 3.
Analysis: from the Weibull distribution diagram of the electrical tree initiation voltage in FIG. 2, it can be seen that the corresponding groups C (16.77 kV) and D (16.05 kV) are significantly higher than groups A (12.94 kV) and B (13.92 kV). The ultraviolet absorber-containing repair liquid can effectively inhibit the initiation of the electrical tree in the heat aging cable, has excellent repair effect, and has better repair effect than pentamethylpiperidinol.
(2) Electric tree initiation experiment of water tree aged cable
A4.5 mm thick fan-shaped sheet containing water tree sections was cut from each of the A, B, C, D four sets of water tree aged cable samples, and an electrical tree initiation experiment was performed as described in (1). The experimental results are shown in FIG. 4.
Analysis: from the Weibull distribution graph of the electric tree initiation voltage in the water tree area after the water tree aged cable is repaired in FIG. 4, the electric tree initiation voltage of the sample A after the water tree is aged for 30 days is 13.3kV, the electric tree initiation voltage after the water tree is repaired in the group B is 15.4kV, the electric tree initiation voltage after the water tree is repaired in the group C is 19.76kV, and the electric tree initiation voltage after the water tree is repaired in the group D is 19.24kV. The repair liquid containing the ultraviolet absorber can effectively inhibit secondary electric tree initiation in the water tree area, and the repair effect of the benzotriazole ultraviolet absorber is better than that of pentamethylpiperidinol.
In summary, the embodiment of the invention discloses a cable targeting repair liquid for resisting electric damage, which can inhibit ultraviolet degradation, and has the following advantages: the ultraviolet light absorber added in the repairing liquid can absorb ultraviolet light wave bands which cause the breakage of insulating molecules, and block the chain reaction of photodegradation, so that the electric tree is restrained from being initiated by electric branches in XLPE and secondarily initiated by water tree areas, and the electric tree initiation voltage is obviously increased; the pentamethylpiperidine alcohol functional structural unit is tetramethyl piperidine, is oxidized into nitrogen oxygen free radical TMPO under the excitation of photoelectrons, can capture free radical R generated by photodegradation of a polymer, generate TMPO R to block the generation of ROO and ROOH, inhibit photodegradation chain reaction, and the benzotriazole ultraviolet absorber can absorb ultraviolet radiation with the wavelength range of 290-400nm, convert absorbed photon energy into vibration energy to release, reduce the attack of photons on matrix molecular chains, and in addition, has the capacity of being electrophilic, can capture high-energy electrons generated by charge injection and extraction in insulation, reduce the influence of the charge injection and extraction on molecular chains, and the two effects reduce a low-density area of the polymer, so that the initiation and the growth of electric trees and electric trees in a water tree area are effectively inhibited; according to the preparation and application of the cable targeting repair liquid for inhibiting ultraviolet degradation and resisting electric damage, provided by the invention, polar molecules in the repair liquid are subjected to targeted migration towards defects under the action of dielectrophoresis force under the action of an electric field, so that the problem of insufficient liquid concentration at the defects caused by migration and consumption of the repair liquid is solved, the long-term effect in water tree repair is improved, the capability of insulating and inhibiting electric trees and secondary electric tree initiation in water tree areas is further improved, the cost is low, the repeatability is good, and the cable targeting repair liquid can be used for large-scale production and application.
It should be noted that the foregoing examples are preferred embodiments of the present invention, but the embodiments of the present invention are not limited to the foregoing examples, and any other changes, modifications, substitutions, combinations, and simplifications that do not depart from the spirit and principles of the present invention should be made as equivalent substitutions, and are included in the scope of the present invention.
In this document, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Moreover, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.
Finally, it should be noted that: it is apparent that the above examples are only illustrative of the present invention and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. And obvious variations or modifications thereof are contemplated as falling within the scope of the present invention.
Claims (10)
1. The cable targeting repair liquid for inhibiting ultraviolet degradation and resisting electric damage is characterized by comprising the following components in parts by weight:
88.5 to 99.5 portions of siloxane; 0.3 to 5.5 portions of catalyst;
0.5 to 6 portions of targeted inducer; 0.2 to 6.0 portions of ultraviolet absorber.
2. The cable targeting repair liquid for resisting electric injury for inhibiting ultraviolet light degradation according to claim 1, wherein the cable targeting repair liquid comprises the following components in parts by weight:
94.3 to 98.6 portions of siloxane; 0.8-2.7 parts of catalyst;
0.8 to 2.5 portions of targeted inducer; 0.6 to 3.0 portions of ultraviolet absorber.
3. The cable targeting repair liquid for resisting electric injury for inhibiting ultraviolet light degradation according to claim 1, wherein the cable targeting repair liquid comprises the following components in parts by weight:
92-99.5 parts of siloxane; 0.3 to 5.0 portions of catalyst;
0.5 to 2.2 portions of targeted inducer; 0.2 to 3 portions of ultraviolet absorber.
4. The cable targeted repair liquid for electric injury resistance for inhibiting ultraviolet light degradation according to claim 1, wherein the catalyst is at least one of titanium isopropoxide, titanium ethoxide, titanium isopropoxide, titanium n-butoxide, titanium methoxide, tetraisopropyl titanate, potassium hydroxide and hydrochloric acid.
5. The cable targeted repair liquid for electric injury resistance for inhibiting ultraviolet light degradation according to claim 1, wherein the targeted inducer is at least one of 2, 4-dihydroxybenzophenone, 2-hydroxy-4-methoxybenzophenone, hexamethylphosphoric triamide.
6. The cable targeted repair liquid for electric injury resistance for inhibiting ultraviolet degradation according to claim 1, wherein the ultraviolet absorber is at least one of benzotriazole ultraviolet absorber, pentamethylpiperidinol, 4-benzoyloxy-2, 6-tetramethylpiperidine and hexamethylphosphoric triamide.
7. The cable targeted repair liquid for electrical damage resistance for inhibiting ultraviolet light degradation according to claim 1, wherein the siloxane is methyl phenyl dimethoxy silane.
8. A method for preparing an electric damage resistant cable targeting repair liquid for inhibiting ultraviolet degradation, which is characterized by comprising the following steps of:
step one, adding siloxane, a catalyst, a targeting inducer and an ultraviolet absorber which are in preset parts by weight into a mixing container for mixing;
and step two, introducing inert gas into the mixing container, stirring for a preset period of time in a room temperature shading environment, and preserving in the room temperature environment after stirring is finished to obtain the cable targeting repair liquid.
9. The method for preparing the cable targeting repair liquid for resisting electric injury, which is used for inhibiting ultraviolet light degradation and is characterized in that in the second step, the preset time period is more than or equal to 30min.
10. An application method of a cable targeting repair liquid for resisting electric damage for inhibiting ultraviolet light degradation, which is characterized by applying the repair liquid according to any one of claims 1-7, and comprising the following steps:
firstly, constructing a repair system, removing terminal heads at two ends of a power cable to be repaired after equipment is inspected and debugged, and respectively installing a front-end adapter and a rear-end adapter;
step two, detecting the penetrability, wherein a front end valve of a front end adapter is connected with an air compressor, inert gas is injected into a cable to be repaired by using the air compressor, and the penetrability is detected by using a barometer;
step three, filling repair liquid into the cable to be repaired, dismantling the air compressor, connecting the repair equipment, adjusting the pressure to enable the repair liquid to be filled into the cable core of the cable to be repaired from the front-end adapter, stopping filling after the repair liquid overflows from the rear-end valve of the rear-end adapter, closing the rear-end valve, and keeping constant pressure for a preset period of time;
and fourthly, repairing an insulating layer of the cable to be repaired, closing a front end valve, keeping a closed state of a rear end valve, applying voltage, standing for a preset period of time, enabling repair liquid to fully infiltrate into the cable insulation, fully reacting with moisture in an aging area of the water tree, filling water tree channels and micropores, opening the front end valve and the rear end valve after repair is finished, discharging residual liquid, and finishing repair.
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| CN115322377A (en) * | 2022-09-01 | 2022-11-11 | 广东电网有限责任公司广州供电局 | Pre-condensed power cable insulation aging repair liquid and preparation method and application thereof |
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| CN115322377A (en) * | 2022-09-01 | 2022-11-11 | 广东电网有限责任公司广州供电局 | Pre-condensed power cable insulation aging repair liquid and preparation method and application thereof |
| CN115322377B (en) * | 2022-09-01 | 2024-03-26 | 广东电网有限责任公司广州供电局 | Pre-condensed power cable insulation aging repair liquid and preparation method and application thereof |
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