CN112285048A - Method and system for representing insulation aging state of crosslinked polyethylene cable - Google Patents
Method and system for representing insulation aging state of crosslinked polyethylene cable Download PDFInfo
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- 229920003020 cross-linked polyethylene Polymers 0.000 title claims abstract description 163
- 239000004703 cross-linked polyethylene Substances 0.000 title claims abstract description 163
- 230000032683 aging Effects 0.000 title claims abstract description 77
- 238000009413 insulation Methods 0.000 title claims abstract description 44
- 238000000034 method Methods 0.000 title claims abstract description 33
- 238000012512 characterization method Methods 0.000 claims abstract description 11
- 125000002915 carbonyl group Chemical group [*:2]C([*:1])=O 0.000 claims description 50
- 238000002835 absorbance Methods 0.000 claims description 29
- 238000001157 Fourier transform infrared spectrum Methods 0.000 claims description 25
- 230000003595 spectral effect Effects 0.000 claims description 21
- 238000012360 testing method Methods 0.000 claims description 13
- 238000004364 calculation method Methods 0.000 claims description 7
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 claims description 5
- 238000011156 evaluation Methods 0.000 abstract description 3
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
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- 230000008569 process Effects 0.000 description 2
- VGGSQFUCUMXWEO-UHFFFAOYSA-N Ethene Chemical compound C=C VGGSQFUCUMXWEO-UHFFFAOYSA-N 0.000 description 1
- 239000005977 Ethylene Substances 0.000 description 1
- 239000004698 Polyethylene Substances 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 230000005540 biological transmission Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 239000013078 crystal Substances 0.000 description 1
- 238000006731 degradation reaction Methods 0.000 description 1
- 238000001514 detection method Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006870 function Effects 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
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- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
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- 238000011056 performance test Methods 0.000 description 1
- -1 polyethylene Polymers 0.000 description 1
- 229920000573 polyethylene Polymers 0.000 description 1
- 238000012545 processing Methods 0.000 description 1
- 239000002994 raw material Substances 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N21/3563—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing solids; Preparation of samples therefor
- G01N2021/3572—Preparation of samples, e.g. salt matrices
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
- G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
- G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
- G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
- G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
- G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
Abstract
The application discloses a method and a system for representing insulation aging state of a cross-linked polyethylene cable. According to the technical scheme, the insulation aging state of the cable is represented by the non-uniform coefficient, a new characterization quantity is provided for the insulation aging state of the cable, and meanwhile, the method is simple and feasible and accurate in evaluation. Therefore, the problem that different cable historical data are different and not comparable is solved, and a new characterization method is provided for characterizing the insulation aging state of the cable.
Description
Technical Field
The application relates to the technical field of cable detection, in particular to a method for judging the insulation aging degree of a cable, and more particularly relates to a method and a system for representing the insulation aging state of a crosslinked polyethylene cable.
Background
The crosslinked polyethylene insulated cable is widely applied to power transmission systems by virtue of excellent electrical and physical and chemical properties. In the long-term operation process, the cable insulation material is aged under the action of various factors, the performance of the cable insulation material is also reduced, and the safety and the reliability of a power system are influenced. The design service life of the crosslinked polyethylene cable is generally 30-40 years, and at present, many lines in China are in the middle and later stages of the design service life, so that the insulation aging state of the crosslinked polyethylene cable needs to be represented.
At present, the insulation aging state of a cable is generally characterized by obtaining characteristic quantities capable of reflecting the degradation of the structure and the performance of a material by utilizing various testing technologies, such as obtaining the elongation at break through a tensile test, observing the crystal form through a scanning electron microscope, or obtaining electrical parameters such as breakdown field strength, dielectric loss factor and the like through an electrical performance test. However, the cable insulation performance values of cables which are not put into operation are different due to differences of the cables of various lines in manufacturers, raw material compositions, production processes and the like. Therefore, only considering the performance parameter size of the target cable sample at the test time influences the accuracy of the aging state characterization.
Disclosure of Invention
The application provides a method and a system for representing an insulation aging state of a crosslinked polyethylene cable, which are used for solving the technical problem that the existing representation of the insulation aging state of the cable is inaccurate.
In view of the above, the first aspect of the present application provides a method for characterizing an insulation aging state of a crosslinked polyethylene cable, comprising the following steps:
s101: fourier transform infrared spectroscopy tests are carried out on a plurality of pre-obtained unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectra corresponding to the crosslinked polyethylene cable slice samples;
s102: acquiring spectral data in Fourier transform infrared spectrums corresponding to the cross-linked polyethylene cable slice samples respectively, and calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data;
s103: calculating the non-uniformity coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample;
s104: and determining the relation between the nonuniform coefficient and the aging state according to the nonuniform coefficient of the crosslinked polyethylene cable slice sample and the aging state of the corresponding crosslinked polyethylene cable sample.
Preferably, the step S101 further includes, before: taking out a plurality of cross-linked polyethylene cable section samples at corresponding different positions along the thickness direction of each cross-linked polyethylene cable sample from the unaged cross-linked polyethylene cable samples and the aged cross-linked polyethylene cable samples respectively.
Preferably, the spectral data in step S102 includes absorbance and wavenumber.
Preferably, the step S102 specifically includes: acquiring absorbance and wave number in a Fourier transform infrared spectrum corresponding to each cross-linked polyethylene cable section sample, drawing a wave number-absorbance curve graph corresponding to each cross-linked polyethylene cable section sample by taking a horizontal axis coordinate as the wave number and a vertical axis coordinate as the absorbance, and calculating a carbonyl index of the corresponding cross-linked polyethylene cable section sample according to the wave number-absorbance curve graph and a preset first formula;
wherein the preset first formula is CI ═ A1/A0，
Wherein CI is the carbonyl index, A1The wave number is 1800-1700 cm-1Area enclosed by curves within the range, A0Is a curve with wave number ranging from 2100 to 2000cm < -1 >The enclosed area.
Preferably, the step S103 specifically includes: calculating the non-uniform coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample and a preset second formula;
wherein the preset second formula is UI ═ CImax/CImean，
In which UI is a non-uniform coefficient, CImaxIs the maximum value of carbonyl index, CI, in all the cross-linked polyethylene cable section samplesmeanThe average value of carbonyl indexes of all the crosslinked polyethylene cable section samples is obtained.
Preferably, the relationship between the unevenness coefficient and the aging state in step S104 is such that the larger the unevenness coefficient is, the deeper the degree of the aging state is.
In another aspect, an insulation aging state characterization system for a crosslinked polyethylene cable provided in an embodiment of the present application includes:
the testing module is used for carrying out Fourier transform infrared spectrum testing on a plurality of pre-obtained unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectrums corresponding to the crosslinked polyethylene cable slice samples;
the first calculation module is used for acquiring spectral data in Fourier transform infrared spectrums corresponding to the cross-linked polyethylene cable slice samples respectively, and is also used for calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data;
the second calculation module is used for calculating the non-uniformity coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample;
and the determining module is used for determining the relation between the uneven coefficient and the aging state according to the uneven coefficient of the cross-linked polyethylene cable slice sample and the aging state of the corresponding cross-linked polyethylene cable sample.
Preferably, the spectral data includes absorbance and wave number, the first calculating module is further configured to obtain absorbance and wave number in a fourier transform infrared spectrum corresponding to each of the cross-linked polyethylene cable slicing samples, further configured to draw a wave number-absorbance curve graph corresponding to each of the cross-linked polyethylene cable slicing samples by using a horizontal axis coordinate as the wave number and a vertical axis coordinate as the absorbance, and further configured to calculate a carbonyl index of the corresponding cross-linked polyethylene cable slicing sample according to the wave number-absorbance curve graph and a preset first formula;
wherein the preset first formula is CI ═ A1/A0，
Wherein CI is the carbonyl index, A1The wave number is 1800-1700 cm-1Area enclosed by curves within the range, A0The area is defined by curves with wave number ranging from 2100 cm-2000 cm < -1 >.
Preferably, the second calculating module is further configured to calculate a non-uniformity coefficient of the cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample and a preset second formula;
wherein the preset second formula is UI ═ CImax/CImean，
In which UI is a non-uniform coefficient, CImaxIs the maximum value of carbonyl index, CI, in all the cross-linked polyethylene cable section samplesmeanThe average value of carbonyl indexes of all the crosslinked polyethylene cable section samples is obtained.
Preferably, the relationship between the unevenness coefficient and the aging state is such that the larger the unevenness coefficient, the deeper the degree of the aging state.
According to the technical scheme, the embodiment of the application has the following advantages:
the embodiment of the application provides a method and a system for representing the insulation aging state of a crosslinked polyethylene cable, wherein the method comprises the following steps: fourier transform infrared spectroscopy tests are carried out on a plurality of pre-obtained unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectra corresponding to the crosslinked polyethylene cable slice samples; acquiring spectral data in Fourier transform infrared spectrums corresponding to the cross-linked polyethylene cable slice samples respectively, and calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data; calculating the non-uniformity coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample; and determining the relation between the nonuniform coefficient and the aging state according to the nonuniform coefficient of the crosslinked polyethylene cable slice sample and the aging state of the corresponding crosslinked polyethylene cable sample. According to the method, the insulation aging state of the cable is represented by the non-uniform coefficient, a new characterization quantity is provided for the insulation aging state of the cable, and meanwhile, the method is simple and feasible and accurate in evaluation. Therefore, the problem that different cable historical data are different and not comparable is solved, and a new characterization method is provided for characterizing the insulation aging state of the cable.
Drawings
Fig. 1 is a flowchart of a method for characterizing an insulation aging state of a crosslinked polyethylene cable according to an embodiment of the present application;
fig. 2 is a flowchart of a method for characterizing an insulation aging state of a crosslinked polyethylene cable according to another embodiment of the present application;
FIG. 3 is a schematic cross-sectional view of a cross-linked polyethylene cable sample in a method for characterizing the insulation aging state of a cross-linked polyethylene cable according to an embodiment of the present application;
FIG. 4 is a carbonyl index variation graph of cross-linked polyethylene cable slice samples with different aging degrees along with thickness positions in a cross-linked polyethylene cable insulation aging state characterization method provided by the embodiment of the application;
FIG. 5 is a graph showing the variation of the non-uniformity coefficient with aging time in a method for characterizing the insulation aging state of an ethylene-based cable according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of an insulation aging state characterization system for an interconnected polyethylene cable according to an embodiment of the present application.
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. 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 application.
For easy understanding, please refer to fig. 1, the present application provides a method for characterizing an insulation aging state of a crosslinked polyethylene cable, comprising the following steps:
s101: fourier transform infrared spectroscopy tests are carried out on a plurality of pre-obtained unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectra corresponding to the crosslinked polyethylene cable slice samples;
s102: acquiring spectral data in Fourier transform infrared spectra corresponding to the cross-linked polyethylene cable slice samples respectively, and calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data;
s103: calculating the non-uniformity coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample;
s104: and determining the relation between the uneven coefficient and the aging state according to the uneven coefficient of the crosslinked polyethylene cable slice sample and the aging state of the corresponding crosslinked polyethylene cable sample.
It can be understood that, in the embodiment, by using the non-uniformity coefficient to characterize the insulation aging state of the cable, a new characterization quantity is provided for the insulation aging state of the cable, and meanwhile, the method is simple and feasible and the evaluation is accurate.
The above is a detailed description of an embodiment of a method for characterizing an insulation aging state of a crosslinked polyethylene cable provided by the present application, and the following is a detailed description of another embodiment of a method for characterizing an insulation aging state of a crosslinked polyethylene cable provided by the present application.
For convenience of understanding, referring to fig. 2, the method for characterizing the insulation aging state of a crosslinked polyethylene cable provided in this embodiment includes the following steps:
s201: respectively taking out a plurality of cross-linked polyethylene cable slice samples at corresponding different positions in the thickness direction of each cross-linked polyethylene cable sample from unaged cross-linked polyethylene cable samples and aged cross-linked polyethylene cable samples;
in this example, unaged and aged crosslinked polyethylene cable samples were tested and prepared in advance, wherein the unaged time was 0, the aged time was 48h, 96h, 144h, 192h, and 240h, respectively, and six crosslinked polyethylene cable slice samples in different aging states were prepared by combining the unaged cable samples and five aged cable samples.
As shown in fig. 3, the cross-linked polyethylene cable sample sequentially comprises a conductor, an inner shielding layer and a cross-linked polyethylene layer from inside to outside, and the cross-linked polyethylene cable slice sample is a cross-linked polyethylene cable slice sample obtained by taking out a plurality of cross-linked polyethylene cable slice samples at different positions along a radial direction from outside to inside, wherein the thickness of a single cross-linked polyethylene cable slice sample is 0.5 mm.
S202: fourier transform infrared spectroscopy tests are carried out on a plurality of unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectrums corresponding to the crosslinked polyethylene cable slice samples;
s203: acquiring spectral data in Fourier transform infrared spectra corresponding to the cross-linked polyethylene cable slice samples respectively, and calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data;
note that the spectral data includes absorbance and wavenumber, and the following is a detailed procedure for calculating the carbonyl index of the crosslinked polyethylene cable section sample:
acquiring absorbance and wave number in Fourier transform infrared spectra corresponding to the cross-linked polyethylene cable section samples, drawing wave number-absorbance curve graphs corresponding to the cross-linked polyethylene cable section samples by taking a horizontal axis coordinate as the wave number and a vertical axis coordinate as the absorbance, and calculating carbonyl indexes of the corresponding cross-linked polyethylene cable section samples according to the wave number-absorbance curve graphs and a preset first formula;
wherein the preset first formula is CI ═ A1/A0，
Wherein CI is the carbonyl index, A1The wave number is 1800-1700 cm-1Area enclosed by curves within the range, A0The area is defined by curves with wave number ranging from 2100 cm-2000 cm < -1 >.
In this example, carbonyl indexes were calculated for six samples of cross-linked polyethylene cable sections with different aging degrees, and the carbonyl indexes are shown in fig. 4 as a function of thickness.
S204: calculating the non-uniformity coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample;
the specific process for calculating the nonuniform coefficient of the cross-linked polyethylene cable section sample is as follows:
calculating the non-uniform coefficient of the corresponding cross-linked polyethylene cable section sample according to the carbonyl index of the cross-linked polyethylene cable section sample and a preset second formula;
wherein the preset second formula is UI ═ CImax/CImean，
In which UI is a non-uniform coefficient, CImaxThe maximum value of carbonyl index, CI, in all samples of the crosslinked polyethylene cablemeanThe average value of carbonyl indexes of all the crosslinked polyethylene cable section samples is obtained.
S205: determining the relationship between the uneven coefficient and the aging state according to the uneven coefficient of the crosslinked polyethylene cable slice sample and the aging state of the corresponding crosslinked polyethylene cable sample;
as shown in fig. 5, which is a graph of the change of the unevenness coefficient with the aging time calculated in the present embodiment, it can be seen from fig. 5 that the relationship between the unevenness coefficient and the aging state is such that the larger the unevenness coefficient is, the deeper the degree of the aging state is.
The above detailed description is another embodiment of the method for characterizing the insulation aging state of the crosslinked polyethylene cable provided by the present application, and the following is an embodiment of the system for characterizing the insulation aging state of the crosslinked polyethylene cable provided by the present application.
For convenience of understanding, please refer to fig. 6, this embodiment provides a system for characterizing an insulation aging state of a crosslinked polyethylene cable, including:
the testing module is used for carrying out Fourier transform infrared spectrum testing on a plurality of pre-obtained unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectrums corresponding to the crosslinked polyethylene cable slice samples;
the first calculation module is used for acquiring spectral data in Fourier transform infrared spectrums corresponding to the cross-linked polyethylene cable slice samples respectively, and is also used for calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data;
the second calculation module is used for calculating the non-uniform coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample;
and the determining module is used for determining the relation between the uneven coefficient and the aging state according to the uneven coefficient of the crosslinked polyethylene cable slice sample and the aging state of the corresponding crosslinked polyethylene cable sample.
The first calculation module is further used for obtaining absorbance and wave number in Fourier transform infrared spectra corresponding to the crosslinked polyethylene cable section samples, drawing wave number-absorbance curve graphs corresponding to the crosslinked polyethylene cable section samples by taking a horizontal axis coordinate as the wave number and a vertical axis coordinate as the absorbance, and calculating carbonyl indexes of the corresponding crosslinked polyethylene cable section samples according to the wave number-absorbance curve graphs and a preset first formula;
wherein the preset first formula is CI ═ A1/A0，
Wherein CI is the carbonyl index, A1The wave number is 1800-1700 cm-1Area enclosed by curves within the range, A0The wave number is 2100-2000 cm-1Area enclosed by curves within the range.
Further, the second calculating module is further configured to calculate a non-uniformity coefficient of the corresponding cross-linked polyethylene cable section sample according to the carbonyl index of the cross-linked polyethylene cable section sample and a preset second formula;
wherein the preset second formula is UI ═ CImax/CImean，
In which UI is a non-uniform coefficient, CImaxThe maximum value of carbonyl index, CI, in all samples of the crosslinked polyethylene cablemeanThe average value of carbonyl indexes of all the crosslinked polyethylene cable section samples is obtained.
Further, the relationship between the unevenness coefficient and the aging state is such that the larger the unevenness coefficient, the deeper the degree of the aging state.
In the several embodiments provided in the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present application may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for executing all or part of the steps of the method described in the embodiments of the present application through a computer device (which may be a personal computer, a server, or a network device). And the aforementioned storage medium includes: a U disk, a removable hard disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (10)
1. A method for characterizing the insulation aging state of a crosslinked polyethylene cable is characterized by comprising the following steps:
s101: fourier transform infrared spectroscopy tests are carried out on a plurality of pre-obtained unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectra corresponding to the crosslinked polyethylene cable slice samples;
s102: acquiring spectral data in Fourier transform infrared spectrums corresponding to the cross-linked polyethylene cable slice samples respectively, and calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data;
s103: calculating the non-uniformity coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample;
s104: and determining the relation between the nonuniform coefficient and the aging state according to the nonuniform coefficient of the crosslinked polyethylene cable slice sample and the aging state of the corresponding crosslinked polyethylene cable sample.
2. The method for characterizing the insulation aging state of the crosslinked polyethylene cable according to claim 1, wherein the step S101 is preceded by: taking out a plurality of cross-linked polyethylene cable section samples at corresponding different positions along the thickness direction of each cross-linked polyethylene cable sample from the unaged cross-linked polyethylene cable samples and the aged cross-linked polyethylene cable samples respectively.
3. The method for characterizing the insulation aging state of the crosslinked polyethylene cable according to claim 1, wherein the spectral data in the step S102 includes absorbance and wavenumber.
4. The method for characterizing the insulation aging state of the crosslinked polyethylene cable according to claim 3, wherein the step S102 specifically comprises: acquiring absorbance and wave number in a Fourier transform infrared spectrum corresponding to each cross-linked polyethylene cable section sample, drawing a wave number-absorbance curve graph corresponding to each cross-linked polyethylene cable section sample by taking a horizontal axis coordinate as the wave number and a vertical axis coordinate as the absorbance, and calculating a carbonyl index of the corresponding cross-linked polyethylene cable section sample according to the wave number-absorbance curve graph and a preset first formula;
wherein the preset first formula is CI ═ A1/A0，
Wherein CI is the carbonyl index, A1The wave number is 1800-1700 cm-1Area enclosed by curves within the range, A0The area is defined by curves with wave number ranging from 2100 cm-2000 cm < -1 >.
5. The method for characterizing the insulation aging state of a crosslinked polyethylene cable according to any one of claims 1 to 4, wherein the step S103 specifically comprises: calculating the non-uniform coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample and a preset second formula;
wherein the preset second formula is UI ═ CImax/CImean，
In which UI is a non-uniform coefficient, CImaxIs the maximum value of carbonyl index, CI, in all the cross-linked polyethylene cable section samplesmeanThe average value of carbonyl indexes of all the crosslinked polyethylene cable section samples is obtained.
6. The method for characterizing the insulation aging state of the crosslinked polyethylene cable according to claim 1, wherein the relationship between the nonuniformity index and the aging state in the step S104 is such that the larger the nonuniformity index is, the deeper the aging state is.
7. A cross-linked polyethylene cable insulation aging status characterization system, comprising:
the testing module is used for carrying out Fourier transform infrared spectrum testing on a plurality of pre-obtained unaged and aged crosslinked polyethylene cable slice samples to obtain Fourier transform infrared spectrums corresponding to the crosslinked polyethylene cable slice samples;
the first calculation module is used for acquiring spectral data in Fourier transform infrared spectrums corresponding to the cross-linked polyethylene cable slice samples respectively, and is also used for calculating carbonyl indexes of the corresponding cross-linked polyethylene cable slice samples according to the spectral data;
the second calculation module is used for calculating the non-uniformity coefficient of the corresponding cross-linked polyethylene cable slice sample according to the carbonyl index of the cross-linked polyethylene cable slice sample;
and the determining module is used for determining the relation between the uneven coefficient and the aging state according to the uneven coefficient of the cross-linked polyethylene cable slice sample and the aging state of the corresponding cross-linked polyethylene cable sample.
8. The system for characterizing the insulation aging state of the crosslinked polyethylene cable according to claim 7, wherein the spectral data includes absorbance and wave number, the first calculating module is further configured to obtain the absorbance and wave number in the fourier transform infrared spectrum corresponding to each of the crosslinked polyethylene cable section samples, further configured to plot a wave number-absorbance curve corresponding to each of the crosslinked polyethylene cable section samples by using the horizontal axis coordinate as the wave number and the vertical axis coordinate as the absorbance, and further configured to calculate the carbonyl index of the corresponding crosslinked polyethylene cable section sample according to the wave number-absorbance curve and a preset first formula;
wherein the preset first formula is CI ═ A1/A0，
Wherein CI is the carbonyl index, A1The wave number is 1800-1700 cm-1Area enclosed by curves within the range, A0The area is defined by curves with wave number ranging from 2100 cm-2000 cm < -1 >.
9. The system for characterizing the insulation aging state of the crosslinked polyethylene cable according to claim 7, wherein the second calculating module is further configured to calculate the non-uniformity coefficient of the corresponding crosslinked polyethylene cable slice sample according to the carbonyl index of the crosslinked polyethylene cable slice sample and a preset second formula;
wherein the preset second formula is UI ═ CImax/CImean，
In which UI is a non-uniform coefficient, CImaxFor all the crosslinked polyethylene cable slice samples, the carbonyl fingerMaximum value of number, CImeanThe average value of carbonyl indexes of all the crosslinked polyethylene cable section samples is obtained.
10. The cross-linked polyethylene cable insulation aging state characterization system according to claim 7, wherein the relationship between the non-uniformity coefficient and the aging state is that the larger the non-uniformity coefficient, the deeper the degree of the aging state.
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