CN108484975B - Method for inhibiting space charge of high-voltage direct-current cable by benzophenone derivative - Google Patents
Method for inhibiting space charge of high-voltage direct-current cable by benzophenone derivative Download PDFInfo
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- CN108484975B CN108484975B CN201810164534.6A CN201810164534A CN108484975B CN 108484975 B CN108484975 B CN 108484975B CN 201810164534 A CN201810164534 A CN 201810164534A CN 108484975 B CN108484975 B CN 108484975B
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- 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
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- 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
Abstract
The invention discloses a method for inhibiting space charge of a high-voltage direct-current cable by using a benzophenone derivative, which mainly comprises the steps of putting low-density polyethylene, an antioxidant, a cross-linking agent and 4, 4' -dihydroxy benzophenone in an internal mixer according to the mass ratio of 100: 0.1: 2: 0.5, fully mixing at the temperature of 110 ℃ to obtain an internal mixing mixture, preheating to fully melt, pressurizing and crosslinking, keeping the pressure unchanged to naturally cool a crosslinked polyethylene sample to room temperature, taking out the sample to press, and putting the sample in a vacuum box for drying.
Description
Technical Field
The invention belongs to the technical field of inhibition of insulation space charge of a high-voltage direct-current cross-linked polyethylene cable, and particularly relates to a method for inhibiting the space charge of the high-voltage direct-current cable by using a benzophenone derivative.
Background
High voltage direct current cables play an irreplaceable role in present power systems, and crosslinked polyethylene is a main insulating material currently applied to high voltage direct current cables. When the high-voltage direct-current cable runs, the crosslinked polyethylene insulating material is easy to inject and accumulate space charges under a direct-current field, so that the electric field is distorted and the insulating properties such as aging, partial discharge, breakdown and the like are influenced. According to the theory of electromagnetic field, 1 mu C/cm in the flat plate sample3The space charge of (a) generates an electric field of 50kV/mm at 1 mm. Space charge accumulation can affect the electric field distribution and cause local electric field distortion. If the space charge density is high, the local electric field strength will exceed the dielectric breakdown strength and cause an initial electrical breakdown. Even if the local electric field is not too high, the space charge build-up gradually degrades the dielectric, leading to the formation of insulation defects, thereby reducing the reliability and lifetime of the high voltage dc cable for long term operation. Therefore, the research on the inhibition method of space charge in the crosslinked polyethylene insulating material is of great significance.
In recent decades, some researchers have conducted studies on the space charge inhibition method of crosslinked polyethylene materials using nano-polymers. However, how to ensure uniform dispersion of nanoparticles in a crosslinked polyethylene material is always a difficult problem which cannot be effectively solved. The agglomeration of the nanoparticles in the crosslinked polyethylene material can make the nanoparticles itself an impurity, which seriously deteriorates the insulating properties of the crosslinked polyethylene material. The invention provides a method for inhibiting the insulation space charge of a high-voltage direct-current cross-linked polyethylene cable by utilizing a benzophenone derivative based on the good compatibility of the benzophenone derivative and a cross-linked polyethylene material. Experiments prove that the method can effectively inhibit the accumulation of space charge in the crosslinked polyethylene insulating material.
Disclosure of Invention
The invention aims to overcome the technical defects in the prior art and provides a method for inhibiting space charge of a high-voltage direct-current cable by using a benzophenone derivative.
The technical scheme adopted by the invention for solving the technical problems is as follows: a method for inhibiting space charge of a high voltage dc cable with a benzophenone derivative, the method comprising the steps of:
1) according to the mass ratio of 100: 0.1: 2: 0.5 placing the low-density polyethylene, the antioxidant, the cross-linking agent and the 4, 4' -dihydroxy benzophenone in an internal mixer to be fully mixed at the temperature of 110 ℃ to obtain an internal mixing mixture;
2) placing the banburying mixture in the step 1) in a vulcanizing press, and preheating for 10 minutes at 120 ℃ to fully melt the mixture;
3) pressurizing the vulcanizing press to 30MPa, raising the temperature to 180 ℃, and fully crosslinking to obtain a crosslinked polyethylene sample;
4) keeping the pressure unchanged to naturally cool the crosslinked polyethylene sample to room temperature, taking out the sample, and pressing the sample into a side length of 40 × 40mm and a thickness of 250 mu m;
5) and (3) placing the sample in a vacuum box, setting the temperature at 80 ℃, and drying the sample in vacuum for 48 hours to fully remove impurities generated in the sample crosslinking process.
The antioxidant in the step 1) is preferably an antioxidant 1010.
The crosslinking agent in the step 1) is preferably dicumyl peroxide.
The rotating speed of the internal mixer in the step 1) is 100 r/min.
Advantageous effects
Meanwhile, the 4, 4' -dihydroxy benzophenone can absorb the energy of high-energy electrons injected by a high-voltage electrode, so that the space charge is not easy to be injected into the crosslinked polyethylene, and the absorbed energy is released in a mode harmless to the crosslinked polyethylene, thereby further reducing the possibility of the insulation failure of the crosslinked polyethylene;
as the energy of space charge injected into a sample is absorbed by the 4, 4' -dihydroxy benzophenone, and the charge with lower energy is captured by the trap with shallower energy level in the crosslinked polyethylene, the charge is easier to separate from the trap in the depolarization process, and the space charge is quickly dissipated, as shown in figure 3, the method accelerates the dissipation of the space charge in X L PE, which has important significance for X L PE for high-voltage direct-current cables.
Drawings
FIG. 1 shows the chemical formula of 4, 4' -dihydroxybenzophenone.
Fig. 2 is a comparison of space charge polarization characteristics:
(a) space charge polarization characteristics of a control group of pure X L PE samples;
(b) the space charge polarization characteristic of the modified X L PE sample is disclosed.
Fig. 3 is a comparison of space charge depolarization characteristics:
(a) space charge depolarization characteristics of control group pure X L PE samples;
(b) the space charge depolarization characteristic of the modified X L PE sample is disclosed.
Detailed Description
The invention is further illustrated by the following specific examples and the accompanying drawings. The examples are intended to better enable those skilled in the art to better understand the present invention and are not intended to limit the present invention in any way.
The method for inhibiting the space charge of the high-voltage direct-current cable by the benzophenone derivative comprises the following steps:
1) placing dried L DPE, an antioxidant 1010, dicumyl peroxide (DCP) and 4, 4' -dihydroxy benzophenone in an internal mixer according to the mass ratio of 100: 0.1: 2: 0.5, and fully mixing for 30 minutes at the temperature of 110 ℃ and the rotational speed of the internal mixer of 100r/min to obtain an internal mixing mixture;
2) weighing 1.5 g of banburying mixture, placing the banburying mixture in a flat vulcanizing machine, and preheating for 10 minutes at 120 ℃ to fully melt the mixture;
3) pressurizing the vulcanizing press to 30MPa, raising the temperature to 180 ℃, and pressing for 30 minutes to fully crosslink L DPE into crosslinked polyethylene (X L PE);
4) closing a power supply of the vulcanizing press, keeping the pressure unchanged to naturally cool the sample to room temperature, and taking out the sample, wherein the side length of the film sample is 40mm, 3540 mm and the thickness of the film sample is 250 mu m;
5) the sample is placed in a vacuum box with the temperature set to 80 ℃ and dried for 48 hours in vacuum, so that impurities generated in the sample crosslinking process are fully removed.
And (3) comparison test:
setting a control group, wherein the test steps of the control group are the same as the above except that 4, 4' -dihydroxy benzophenone is not added in the components added in the step 1).
And (3) detection process:
1. the space charge polarization characteristics of a pure X L PE sample of a control group and a modified X L PE sample of the invention are researched, the space charge characteristics of the sample are tested at room temperature by adopting a PEA method, the space charge injection and accumulation characteristics of the sample in a pressurizing polarization process are obtained by measuring for 30 minutes under the condition of a-30 kV/mm direct-current electric field, and as shown in figure 2, the space charge injection and accumulation in the X L PE are obviously inhibited by the invention;
2. the space charge depolarization characteristics of the pure X L PE of the control group and the modified X L PE sample are researched, wherein the space charge depolarization characteristics of the sample in the short circuit depolarization process are obtained by switching off a power supply and performing short circuit measurement for 15 minutes, and as shown in figure 3, the dissipation of the space charge in the X L PE is accelerated by the method.
Claims (4)
1. A method for inhibiting space charge of a high-voltage direct-current cable by using a benzophenone derivative is characterized by comprising the following steps:
1) according to the mass ratio of 100: 0.1: 2: 0.5 placing the low-density polyethylene, the antioxidant, the cross-linking agent and the 4, 4' -dihydroxy benzophenone in an internal mixer to be fully mixed at the temperature of 110 ℃ to obtain an internal mixing mixture;
2) placing the banburying mixture in the step 1) in a vulcanizing press, and preheating for 10 minutes at 120 ℃ to fully melt the mixture;
3) pressurizing the vulcanizing press to 30MPa, raising the temperature to 180 ℃, and fully crosslinking to obtain a crosslinked polyethylene sample;
4) keeping the pressure unchanged to naturally cool the crosslinked polyethylene sample to room temperature, taking out the sample, and pressing the sample into a material with the side length of 40mm × 40mm and the thickness of 250 mu m;
5) and (3) placing the sample in a vacuum box, setting the temperature at 80 ℃, and drying the sample in vacuum for 48 hours to fully remove impurities generated in the sample crosslinking process.
2. The method for inhibiting space charge of high voltage direct current cables with benzophenone derivatives according to claim 1, wherein said antioxidant in step 1) is preferably antioxidant 1010.
3. The method for inhibiting space charge of high voltage direct current cables with benzophenone derivatives according to claim 1, wherein said cross-linking agent in step 1) is preferably dicumyl peroxide.
4. The method for inhibiting space charge of high voltage direct current cable by benzophenone derivatives according to claim 1, wherein in step 1) the internal mixer is rotated at 100 r/min.
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| CN201810164534.6A CN108484975B (en) | 2018-02-27 | 2018-02-27 | Method for inhibiting space charge of high-voltage direct-current cable by benzophenone derivative |
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| CN109384998B (en) * | 2018-10-29 | 2021-05-25 | 中国医学科学院放射医学研究所 | Polyolefin insulating material resistant to electrical tree aging and preparation method thereof |
| CN109776910A (en) * | 2018-12-25 | 2019-05-21 | 天津大学 | A kind of preparation method for the crosslinked polyethylene insulation material inhibiting space charge |
| CN113831247B (en) * | 2021-08-19 | 2022-08-26 | 南方电网科学研究院有限责任公司 | Maleic anhydride modified voltage stabilizer and preparation method and application thereof |
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| ATE531756T1 (en) * | 2008-09-09 | 2011-11-15 | Borealis Ag | POLYOLEFIN COMPOSITION FOR MEDIUM/HIGH/EXTRA HIGH VOLTAGE CABLES WITH BENZOPHENONE VOLTAGE STABILIZER |
| CN103965543B (en) * | 2014-05-21 | 2016-08-24 | 哈尔滨理工大学 | A kind of high voltage direct current cable cross-linkable polyethylene insulation material |
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