CN108562831B - Method for manufacturing insulating material - Google Patents
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- CN108562831B CN108562831B CN201711349087.3A CN201711349087A CN108562831B CN 108562831 B CN108562831 B CN 108562831B CN 201711349087 A CN201711349087 A CN 201711349087A CN 108562831 B CN108562831 B CN 108562831B
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- 239000011810 insulating material Substances 0.000 title claims abstract description 162
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 34
- 238000009826 distribution Methods 0.000 claims abstract description 114
- 238000001514 detection method Methods 0.000 claims abstract description 36
- 238000004132 cross linking Methods 0.000 claims abstract description 29
- 238000009413 insulation Methods 0.000 claims abstract description 16
- 229920003020 cross-linked polyethylene Polymers 0.000 claims description 26
- 239000004703 cross-linked polyethylene Substances 0.000 claims description 26
- 239000004698 Polyethylene Substances 0.000 claims description 23
- -1 polyethylene Polymers 0.000 claims description 22
- 229920000573 polyethylene Polymers 0.000 claims description 22
- 238000005259 measurement Methods 0.000 claims description 8
- 238000004364 calculation method Methods 0.000 claims description 7
- 230000001678 irradiating effect Effects 0.000 claims description 6
- 238000013022 venting Methods 0.000 claims description 6
- 239000004020 conductor Substances 0.000 claims description 5
- 230000005684 electric field Effects 0.000 claims description 4
- 150000002500 ions Chemical class 0.000 claims description 4
- GNFTZDOKVXKIBK-UHFFFAOYSA-N 3-(2-methoxyethoxy)benzohydrazide Chemical compound COCCOC1=CC=CC(C(=O)NN)=C1 GNFTZDOKVXKIBK-UHFFFAOYSA-N 0.000 claims description 3
- FGUUSXIOTUKUDN-IBGZPJMESA-N C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 Chemical compound C1(=CC=CC=C1)N1C2=C(NC([C@H](C1)NC=1OC(=NN=1)C1=CC=CC=C1)=O)C=CC=C2 FGUUSXIOTUKUDN-IBGZPJMESA-N 0.000 claims description 3
- YTAHJIFKAKIKAV-XNMGPUDCSA-N [(1R)-3-morpholin-4-yl-1-phenylpropyl] N-[(3S)-2-oxo-5-phenyl-1,3-dihydro-1,4-benzodiazepin-3-yl]carbamate Chemical compound O=C1[C@H](N=C(C2=C(N1)C=CC=C2)C1=CC=CC=C1)NC(O[C@H](CCN1CCOCC1)C1=CC=CC=C1)=O YTAHJIFKAKIKAV-XNMGPUDCSA-N 0.000 claims description 3
- 230000000903 blocking effect Effects 0.000 claims description 2
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000006243 chemical reaction Methods 0.000 claims description 2
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000463 material Substances 0.000 description 23
- 229920003023 plastic Polymers 0.000 description 6
- 239000004033 plastic Substances 0.000 description 6
- 239000007789 gas Substances 0.000 description 5
- 239000012774 insulation material Substances 0.000 description 5
- 239000000126 substance Substances 0.000 description 5
- 238000007872 degassing Methods 0.000 description 4
- 239000012535 impurity Substances 0.000 description 4
- 238000004458 analytical method Methods 0.000 description 2
- 239000003431 cross linking reagent Substances 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000001125 extrusion Methods 0.000 description 2
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- 238000001228 spectrum Methods 0.000 description 2
- 238000012512 characterization method Methods 0.000 description 1
- 238000010382 chemical cross-linking Methods 0.000 description 1
- 230000003749 cleanliness Effects 0.000 description 1
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- 238000011161 development Methods 0.000 description 1
- 238000007689 inspection Methods 0.000 description 1
- 239000005445 natural material Substances 0.000 description 1
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
- G01R31/1227—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials
- G01R31/1263—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing of components, parts or materials of solid or fluid materials, e.g. insulation films, bulk material; of semiconductors or LV electronic components or parts; of cable, line or wire insulation
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
- H01B13/00—Apparatus or processes specially adapted for manufacturing conductors or cables
- H01B13/06—Insulating conductors or cables
Abstract
The invention provides a manufacturing method of an insulating material, and a detection method of the insulating material comprises the following steps: acquiring first space charge distribution information of a first insulating material; acquiring second space charge distribution information of a second insulating material, wherein the second insulating material is obtained by crosslinking the first insulating material; and comparing the first space charge distribution information with the second space charge distribution information to generate a detection result of the second insulating material. By implementing the method, the space charge distribution information of the insulating materials before and after crosslinking is obtained and compared, and the detection result of the crosslinked insulating material is generated, so that the manufacture quality of cable insulation is judged from the quantitative angle, and the detection effect of the cable insulation is more accurate.
Description
Technical Field
The invention relates to the technical field of power cable manufacturing, in particular to a manufacturing method of an insulating material.
Background
With the development and progress of electrical insulating materials, the insulating materials used in the current power cables are all made of synthetic plastic material polyethylene (abbreviated as PE material in english). Because the stability of the artificial synthetic material is deviated from that of a natural material, the artificial plastic material can be subjected to cross-linking through a physical or chemical method, new chemical bonds are generated among chains in the artificial high polymer material, so that the chemical structure of the artificial high polymer material is developed into reticulation from chain property, and the long service life and high reliability of the insulated cable are ensured. This crosslinked polyethylene material is also known as crosslinked polyethylene (XLPE). In order to realize the large-scale high-quality production of the cable mainly insulated by the plastic material, the manufacturing industry develops a roller type or vertical tower type three-layer co-extrusion technology which applies a chemical method (adding a cross-linking agent) cross-linking process to realize the stable manufacturing of the plastic insulation material cable, and the cable manufactured by applying the method is called XLPE cable in the cable industry.
In the context of large-scale preparation of XLPE cables, in order to ensure the quality of XLPE production, it is necessary to perform insulation quality inspection on the XLPE material produced. At present, a degassing method (also called an exhaust method) is generally adopted in the process to control the manufacturing quality of the insulating layer. The principle is that after the cross-linking process, in a high-temperature environment, most impurities in the polyethylene plastic are discharged from the insulating material to the surrounding environment in a gas form, so that the purpose of detecting the insulation manufacturing quality of the cable can be basically achieved by checking and comparing the component ratio of the gas in the surrounding environment before and after degassing.
The existing degassing method has the advantages that the sampling sample is simple, and the purpose of detecting the insulation quality of the cable can be achieved as long as the component change of the gas components around the target cable is detected along with the time. However, the disadvantage is also obvious, because the cleanliness of the insulation materials used varies with the batches of the insulation materials, the time of the venting process required each time is not fixed, the quality control standard is basically estimated by means of accumulated data, and the quality of the cable insulation materials cannot be judged from a quantitative perspective.
Disclosure of Invention
In view of the above analysis, the present invention provides a method for manufacturing an insulating material, which is used to quantitatively determine the quality of a cable insulating material and further manufacture a high-quality cable insulating material.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides a detection method of an insulating material, which comprises the following steps: acquiring first space charge distribution information of a first insulating material; acquiring second space charge distribution information of a second insulating material, wherein the second insulating material is obtained by crosslinking the first insulating material; and comparing the first space charge distribution information with the second space charge distribution information to generate a detection result of the second insulating material.
In one embodiment, the first insulating material is a polyethylene base and the second insulating material is cross-linked polyethylene.
In one embodiment, obtaining first space charge distribution information of a first insulating material comprises: irradiating the first insulating material with a laser pressure wave source; collecting internal current change information of the first insulating material; and obtaining first space charge distribution information of the first insulating material according to the internal current change information of the first insulating material.
In one embodiment, obtaining second space charge distribution information of the second insulating material comprises: irradiating the second insulating material by using the laser pressure wave source; collecting internal current change information of the second insulating material; and obtaining second space charge distribution information of the second insulating material according to the internal current change information of the second insulating material.
The invention also provides a manufacturing method of the insulating material, which comprises the following steps: step a: acquiring first space charge distribution information of a first insulating material; step b: crosslinking the first insulating material to generate a second insulating material; step c: acquiring second space charge distribution information of the second insulating material; step d: comparing the first space charge distribution information with second space charge distribution information to generate a detection result of the second insulating material; step e: determining exhaust time according to the detection result and the exhaust temperature; step f: venting the second insulating material according to the venting time; step g: acquiring third space charge distribution information of the second insulating material after exhausting; step h: comparing the first space charge distribution information with third space charge distribution information to obtain a comparison result of the first space charge distribution information and the third space charge distribution information; step i: judging whether the comparison result is less than or equal to a preset standard value or not; step j: and e, when the comparison result is larger than the preset standard value, replacing the detection result with the comparison result, and returning to the step e.
In one embodiment, the first insulating material is a polyethylene base and the second insulating material is cross-linked polyethylene.
In one embodiment, obtaining first space charge distribution information of a first insulating material comprises: irradiating the first insulating material with a laser pressure wave source; collecting internal current change information of the first insulating material; and obtaining first space charge distribution information of the first insulating material according to the internal current change information of the first insulating material.
In one embodiment, obtaining second space charge distribution information of the second insulating material comprises: irradiating the second insulating material by using the laser pressure wave source; collecting internal current change information of the second insulating material; and obtaining second space charge distribution information of the second insulating material according to the internal current change information of the second insulating material.
In one embodiment, the second insulating material is degassed using a high temperature degassing process.
In one embodiment, the method of manufacturing an insulating material further comprises: step k: and when the comparison result is less than or equal to the preset standard value, finishing the manufacturing process of the insulating material.
Compared with the prior art, the technical scheme of the invention at least has the following advantages:
the invention provides a detection method of an insulating material, which generates a detection result of the insulating material after crosslinking by acquiring and comparing space charge distribution information of the insulating material before and after crosslinking. The detection method of the insulating material provided by the invention realizes judgment of the manufacturing quality of the cable insulation from the quantitative angle, so that the detection effect of the cable insulation is more accurate.
The invention also provides a manufacturing method of the insulating material, the space charge distribution information of the insulating material before and after crosslinking is obtained and compared, the exhaust time is determined, the crosslinked insulating material is exhausted according to the exhaust time, the space charge distribution information of the insulating material obtained after the exhaust is compared with the space charge distribution information of the insulating material before crosslinking, if the comparison result is larger than a preset standard value, the exhaust is continued until the comparison result of the space charge distribution information of the insulating material obtained and the space charge distribution information of the insulating material before crosslinking is smaller than or equal to the preset standard value, and the exhaust is stopped. The manufacturing method of the insulating material provided by the invention is combined with the detection method of the insulating material, so that the manufacturing of the high-quality cable insulating material is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a flowchart of a specific example of a method of inspecting an insulating material in an embodiment of the present invention;
FIG. 2 is a schematic diagram of a specific example of space charge distribution measurement in an embodiment of the present invention;
FIG. 3 is a wiring diagram of a specific example of space charge distribution measurement in the embodiment of the present invention;
fig. 4 is a flowchart showing a specific example of a method for manufacturing an insulating material in the embodiment of the present invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "first", "second", and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
When the space charge spectrum/curve analysis is carried out on the cross-linked polyethylene and pure polyethylene materials by using a chemical cross-linking method (adding a cross-linking agent), the space charge spectrum/curve of the cross-linked polyethylene and the pure polyethylene materials can be directly distinguished due to a little difference in chemical components. The difference is directly related to the size and concentration of impurities in the crosslinked polyethylene after the crosslinking process is carried out by adopting a three-layer co-extrusion technology. The characterization is directly reflected on the space charge spectrum/curve that the space charge measurement peak value of the crosslinked polyethylene can continuously rise by a certain value on the basis of the space charge measurement peak value of the pure polyethylene material, namely the curve is amplified on the basis of the similarity of the measurement results of the pure polyethylene material. Based on this, embodiments of the present invention provide a method for detecting an insulating material and a method for manufacturing the insulating material, which are respectively described below, to detect the quality of the insulating material in a quantitative manner and to realize the manufacture of the insulating material with high quality.
The embodiment of the invention provides a detection method of an insulating material, which comprises the following steps of:
step S1: first space charge distribution information is obtained for a first insulating material, which may optionally be a polyethylene base in some embodiments of the invention.
Step S2: second space charge distribution information of a second insulating material is obtained, optionally, in some embodiments of the present invention, the second insulating material may be cross-linked polyethylene, which is obtained by cross-linking the first insulating material.
Step S3: and comparing the first space charge distribution information with the second space charge distribution information to generate a detection result of the second insulating material.
According to the detection method of the insulating material, provided by the embodiment of the invention, the detection result of the crosslinked insulating material is generated by acquiring and comparing the space charge distribution information of the insulating material before and after crosslinking, so that the manufacture quality of cable insulation is judged from a quantitative angle, and the detection effect of the cable insulation is more accurate.
The acquisition process of the space charge distribution information of the insulating material before and after crosslinking is similar, namely the insulating material is irradiated by adopting a laser pressure wave source, then the current change information in the insulating material is acquired, and the space charge distribution information of the insulating material is obtained according to the current change information in the insulating material. In the embodiment of the invention, the laser pressure wave source is used as a detection source, the cable insulating layer is not damaged by the laser pressure wave source, the laser power for detection is adjustable, and compared with an acoustic wave source, the laser pressure wave source has high power and strong anti-interference capability, is not only limited to be used in a laboratory, and can realize mobile detection. Specifically, in the specific implementation process of the invention, the detection of the polyethylene base material is carried out in a physicochemical laboratory of a cable plant, the polyethylene base material is irradiated by a laser pressure wave source to obtain the space charge distribution information of the polyethylene base material, and the space charge distribution information is used as a reference standard for the detection of the insulation material after subsequent crosslinking. Similarly, the crosslinked polyethylene is irradiated by the laser pressure wave source with the same power as the laser pressure wave source to obtain the space charge distribution information of the crosslinked polyethylene, and the space charge distribution information of the crosslinked polyethylene is compared with the space charge distribution information of the polyethylene base material to obtain the detection result of the crosslinked polyethylene.
Specifically, it can be that the conductor 22 in the cable core 2 to be tested and the outer shielding layer 21 are connected first by using the circuit shown in fig. 2 and fig. 3, wherein the ammeter 4 for measurement is serially connected and the blocking capacitor 5 is connected to prevent interference. Because the power disturbance generated after the laser pressure wave source 1 irradiates is usually very small, in order to amplify the disturbance, a detection power supply 7 can be added through a resistor 6 on the basis of the circuit, so that voltage is generated, electric field intensity is generated between a cable conductor 22 and a cable outer shielding layer 21, and the electric field intensity can cause electrons 3 and ions in the cable insulation to move to the positive pole and the negative pole respectively. When the laser pressure wave source 1 with a certain intensity irradiates the cable core, a part of electrons or ions obtain enough kinetic energy to jump to the positive electrode or the negative electrode to cause current change, the changed current is subjected to analog-to-digital conversion and is transmitted to the computer 8, and the computer 8 converts the changed current into a space charge distribution curve, namely space charge distribution information of the insulating material. Specifically, the computer 8 may convert the changed current into a space charge distribution curve through MATLAB or COMSOL, which is not limited by the present invention.
Optionally, in some embodiments of the present invention, the space charge distribution information of the crosslinked polyethylene is compared with the space charge distribution information of the polyethylene base material to obtain a detection result of the crosslinked polyethylene, which may be to calculate a deviation of space charge distribution curves of the crosslinked polyethylene and the polyethylene base material, and specifically, the quality of the cable insulation is judged from a quantitative perspective by comparing similarity of the curves and a curve peak value, so that the detection effect of the cable insulation is more accurate. The similarity of the comparison curves can be the amplitude of a first space charge distribution curve of the polyethylene base material and a second space charge distribution curve of the crosslinked polyethylene, specifically, the similarity can be obtained by respectively collecting charge density values under a plurality of sample thicknesses on the first space charge distribution curve and the second space charge distribution curve, calculating the charge density difference of the two curves under each sample thickness, summing the calculated plurality of charge density differences, and comparing the summation result with a first preset standard value; and comparing the peak values of the curves, performing difference calculation on the peak values of the first space charge distribution curve and the second space charge distribution curve, and comparing the difference calculation result with a second preset standard value. When the summation result is less than or equal to a first preset standard value and the difference result is less than or equal to a second preset standard value, namely, the deviation between the space charge distribution curves of the crosslinked polyethylene and the polyethylene base material is judged to be less than or equal to the preset standard value, so that the quality of the cable insulation is judged to reach the standard; and when the summation result is greater than a first preset standard value or the difference result is greater than a second preset standard value, judging that the deviation between the space charge distribution curves of the crosslinked polyethylene and the polyethylene base material is greater than the preset standard value, and judging that the quality of the cable insulation does not reach the standard.
It should be noted that the method for detecting an insulating material provided by the embodiment of the present invention is not only suitable for detecting a cable insulating material, but also can detect the quality of any insulating or plastic material prepared by using a cross-linking method or a doping method and used in a high voltage environment, and any extended application outside the scope of the embodiment of the present invention is also within the scope of the present invention.
An embodiment of the present invention further provides a method for manufacturing an insulating material, as shown in fig. 4, the method for manufacturing an insulating material includes:
step a: acquiring first space charge distribution information of a first insulating material, wherein the first insulating material is polyethylene base material;
step b: crosslinking the first insulating material to generate a second insulating material, wherein the second insulating material is crosslinked polyethylene;
step c: acquiring second space charge distribution information of a second insulating material;
step d: comparing the first space charge distribution information with the second space charge distribution information to generate a detection result of the second insulating material;
step e: determining exhaust time according to the detection result and the exhaust temperature;
step f: the second insulating material is exhausted according to the exhaust time, and the method for exhausting the second insulating material may be to use a high-temperature exhaust method;
step g: acquiring third space charge distribution information of the second insulating material after exhausting;
step h: comparing the first space charge distribution information with the third space charge distribution information to obtain a comparison result of the first space charge distribution information and the third space charge distribution information;
step i: judging whether the comparison result is less than or equal to a preset standard value or not;
step j: when the comparison result is larger than the preset standard value, replacing the detection result with the comparison result, and returning to the step e;
step k: and when the comparison result is less than or equal to a preset standard value, finishing the manufacturing process of the insulating material.
Through the steps a to k, the space charge distribution information of the insulating materials before and after crosslinking is obtained and compared, the exhaust time is determined, the crosslinked insulating material is exhausted according to the exhaust time, the space charge distribution information of the insulating material obtained after the exhaust is compared with the space charge distribution information of the insulating material before crosslinking, if the comparison result is larger than a preset standard value, the exhaust is continued until the comparison result of the space charge distribution information of the insulating material obtained and the space charge distribution information of the insulating material before crosslinking is smaller than or equal to the preset standard value, the exhaust is stopped, and the manufacture of the cable insulating material with high quality is realized.
For a specific process of acquiring the first space charge distribution information of the first insulating material, the second space charge distribution information of the second insulating material, and the third space charge distribution information of the evacuated insulating material, reference may be made to the related contents of the above-mentioned embodiment of the method for detecting an insulating material, and details thereof are not repeated herein.
In the embodiment of the present invention, the impurities or gases present in the crosslinked insulating material directly affect the space charge distribution curve of the insulating material, thereby causing a large deviation of the measurement result from the space charge distribution curve of the insulating material before crosslinking. In the process of high-temperature exhaust of the crosslinked insulating material, the deviation between the space charge distribution curves of the insulating material before and after crosslinking becomes smaller and smaller. And when the deviation between the space charge distribution curves of the insulating materials before and after crosslinking is less than or equal to a preset standard value, the space charge distribution curves before and after crosslinking are basically overlapped, the contents of impurities and gas in the cable insulating material are basically the same as those of the polyethylene base material, finishing the exhaust process, and finishing the manufacturing process of the insulating material.
Specifically, the calculation of the deviation of the space charge distribution curve of the insulating material before and after crosslinking may be to quantitatively analyze the cable insulation quality at the venting stage by comparing the similarity of the curves and the peak value of the curves, thereby obtaining an accurate analysis result. The similarity of the comparison curves can be the amplitude of a first space charge distribution curve of the polyethylene base material and a second space charge distribution curve of the cable insulating material in the exhaust process, specifically, the similarity can be obtained by respectively collecting charge density values under a plurality of sample thicknesses on the first space charge distribution curve and the second space charge distribution curve, calculating the charge density difference of the two curves under each sample thickness, summing the calculated plurality of charge density differences, and comparing the summation result with a first preset standard value; comparing the peak values of the curves, performing difference calculation on the peak values of the first space charge distribution curve and the second space charge distribution curve, and comparing the difference calculation result with a second preset standard value; and when the summation result is less than or equal to a first preset standard value and the difference result is less than or equal to a second preset standard value, namely the deviation between the space charge distribution curves of the insulating materials before and after crosslinking is judged to be less than or equal to the preset standard value, ending the exhaust process and finishing the manufacturing process of the insulating materials.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (6)
1. A method of making an insulating material, comprising:
step a: acquiring first space charge distribution information of a first insulating material;
step b: crosslinking the first insulating material to generate a second insulating material;
step c: acquiring second space charge distribution information of the second insulating material;
step d: comparing the first space charge distribution information with second space charge distribution information to generate a quality detection result of the second insulating material;
step e: determining exhaust time according to the quality detection result and the exhaust temperature;
step f: venting the second insulating material according to the venting time;
step g: acquiring third space charge distribution information of the second insulating material after exhausting;
step h: comparing the first space charge distribution information with third space charge distribution information to obtain a comparison result of the first space charge distribution information and the third space charge distribution information;
step i: judging whether the comparison result is less than or equal to a preset standard value or not;
step j: when the comparison result is larger than the preset standard value, replacing the quality detection result with the comparison result, and returning to the step e;
the step of comparing the first space charge distribution information with the second space charge distribution information to generate a result of detecting the quality of the second insulating material includes:
respectively collecting charge density values under a plurality of sample thicknesses on the first space charge distribution curve and the second space charge distribution curve, solving charge density difference values of the two curves under each sample thickness, summing the solved charge density difference values, and comparing the summation result with a first preset standard value;
performing difference calculation on peak values of the first space charge distribution curve and the second space charge distribution curve, and comparing a difference calculation result with a second preset standard value;
when the summation result is less than or equal to a first preset standard value and the difference result is less than or equal to a second preset standard value, judging that the deviation between the space charge distribution curves of the first insulating material and the second insulating material is less than or equal to the preset standard value, and judging that the quality of the second insulating material reaches the standard;
when the summation result is greater than a first preset standard value or the difference result is greater than a second preset standard value, judging that the deviation between the space charge distribution curves of the first insulating material and the second insulating material is greater than a preset standard value, and judging that the quality of the second insulating material does not reach the standard;
space charge distribution information is acquired by:
connecting a conductor in a cable core of the tested cable with an outer shielding layer, wherein the conductor is serially connected into a current meter for measurement and is connected into a blocking capacitor;
a detection power supply is added through a resistor, the detection power supply generates voltage to generate electric field intensity between a cable conductor and a cable outer shielding layer, and electrons and ions in the cable insulation are caused to move to the positive electrode and the negative electrode respectively due to the electric field intensity;
after the laser pressure wave source irradiates the cable core, part of electrons or ions jump to the anode or the cathode to cause current change, and the changed current is subjected to analog-to-digital conversion and is transmitted to a computer;
the computer converts the varying current into a space charge distribution curve, i.e., space charge distribution information of the insulating material.
2. The method of manufacturing according to claim 1, wherein the first insulating material is a polyethylene base and the second insulating material is cross-linked polyethylene.
3. The manufacturing method according to claim 1 or 2, wherein acquiring first space charge distribution information of the first insulating material includes:
irradiating the first insulating material with a laser pressure wave source;
collecting internal current change information of the first insulating material;
and obtaining first space charge distribution information of the first insulating material according to the internal current change information of the first insulating material.
4. The manufacturing method according to claim 3, wherein acquiring second space charge distribution information of the second insulating material comprises:
irradiating the second insulating material by using the laser pressure wave source;
collecting internal current change information of the second insulating material;
and obtaining second space charge distribution information of the second insulating material according to the internal current change information of the second insulating material.
5. The manufacturing method according to claim 1, wherein the second insulating material is exhausted by a high-temperature exhaust method.
6. The manufacturing method according to claim 1, further comprising:
step k: and when the comparison result is less than or equal to the preset standard value, finishing the manufacturing process of the insulating material.
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| CN201711349087.3A CN108562831B (en) | 2017-12-15 | 2017-12-15 | Method for manufacturing insulating material |
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| CN201711349087.3A CN108562831B (en) | 2017-12-15 | 2017-12-15 | Method for manufacturing insulating material |
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| CN113466574A (en) * | 2021-07-02 | 2021-10-01 | 东方电气集团东方电机有限公司 | Mobile detection device for space charge distribution in insulation of motor wire bar |
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| CN103396601B (en) * | 2013-08-23 | 2015-08-26 | 哈尔滨理工大学 | polyethylene composite material with high dielectric property and preparation method thereof |
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| 交联副产物对交联聚乙烯空间电荷行为的影响;钟琼霞 等;《中国电机工程学报》;20150605;第35卷(第11期);第2903-2910页 * |
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