CN112525849A - Method for rapidly measuring water content of transformer insulation paper - Google Patents
Method for rapidly measuring water content of transformer insulation paper Download PDFInfo
- Publication number
- CN112525849A CN112525849A CN202011334279.9A CN202011334279A CN112525849A CN 112525849 A CN112525849 A CN 112525849A CN 202011334279 A CN202011334279 A CN 202011334279A CN 112525849 A CN112525849 A CN 112525849A
- Authority
- CN
- China
- Prior art keywords
- sample
- insulating paper
- extraction liquid
- spectrum
- moisture
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 title claims abstract description 34
- 238000009413 insulation Methods 0.000 title claims abstract description 29
- 238000000034 method Methods 0.000 title claims abstract description 27
- 238000000605 extraction Methods 0.000 claims abstract description 37
- 239000007788 liquid Substances 0.000 claims abstract description 36
- 238000000120 microwave digestion Methods 0.000 claims abstract description 27
- 238000005303 weighing Methods 0.000 claims abstract description 18
- 238000001514 detection method Methods 0.000 claims abstract description 13
- 239000004698 Polyethylene Substances 0.000 claims abstract description 12
- -1 polyethylene Polymers 0.000 claims abstract description 12
- 229920000573 polyethylene Polymers 0.000 claims abstract description 12
- 238000000874 microwave-assisted extraction Methods 0.000 claims abstract description 11
- RTZKZFJDLAIYFH-UHFFFAOYSA-N Diethyl ether Chemical compound CCOCC RTZKZFJDLAIYFH-UHFFFAOYSA-N 0.000 claims abstract description 10
- 238000002329 infrared spectrum Methods 0.000 claims abstract description 10
- 238000001291 vacuum drying Methods 0.000 claims abstract description 6
- 238000004140 cleaning Methods 0.000 claims abstract description 5
- 239000003208 petroleum Substances 0.000 claims abstract description 5
- 238000002791 soaking Methods 0.000 claims abstract description 5
- 238000010438 heat treatment Methods 0.000 claims abstract description 4
- 238000001228 spectrum Methods 0.000 claims description 33
- 239000002904 solvent Substances 0.000 claims description 31
- OKKJLVBELUTLKV-UHFFFAOYSA-N Methanol Chemical compound OC OKKJLVBELUTLKV-UHFFFAOYSA-N 0.000 claims description 24
- WEVYAHXRMPXWCK-UHFFFAOYSA-N Acetonitrile Chemical compound CC#N WEVYAHXRMPXWCK-UHFFFAOYSA-N 0.000 claims description 18
- IAZDPXIOMUYVGZ-UHFFFAOYSA-N Dimethylsulphoxide Chemical compound CS(C)=O IAZDPXIOMUYVGZ-UHFFFAOYSA-N 0.000 claims description 10
- 238000010521 absorption reaction Methods 0.000 claims description 7
- 238000001157 Fourier transform infrared spectrum Methods 0.000 claims description 6
- 238000004445 quantitative analysis Methods 0.000 claims description 6
- 238000005452 bending Methods 0.000 claims description 4
- 229910001634 calcium fluoride Inorganic materials 0.000 claims description 3
- 238000011002 quantification Methods 0.000 claims description 3
- 230000007613 environmental effect Effects 0.000 abstract description 5
- 238000011156 evaluation Methods 0.000 abstract description 4
- 238000005259 measurement Methods 0.000 abstract description 4
- 238000004458 analytical method Methods 0.000 abstract description 3
- 230000007547 defect Effects 0.000 abstract description 2
- 239000000123 paper Substances 0.000 description 41
- 230000000875 corresponding effect Effects 0.000 description 5
- 238000010561 standard procedure Methods 0.000 description 3
- LFQSCWFLJHTTHZ-UHFFFAOYSA-N Ethanol Chemical compound CCO LFQSCWFLJHTTHZ-UHFFFAOYSA-N 0.000 description 2
- 238000005033 Fourier transform infrared spectroscopy Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 238000001035 drying Methods 0.000 description 2
- 239000003960 organic solvent Substances 0.000 description 2
- 230000004044 response Effects 0.000 description 2
- 239000007787 solid Substances 0.000 description 2
- XNWFRZJHXBZDAG-UHFFFAOYSA-N 2-METHOXYETHANOL Chemical compound COCCO XNWFRZJHXBZDAG-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000002596 correlated effect Effects 0.000 description 1
- 238000005520 cutting process Methods 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000029087 digestion Effects 0.000 description 1
- 238000004090 dissolution Methods 0.000 description 1
- 238000005315 distribution function Methods 0.000 description 1
- 239000012634 fragment Substances 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 239000012774 insulation material Substances 0.000 description 1
- GBMDVOWEEQVZKZ-UHFFFAOYSA-N methanol;hydrate Chemical compound O.OC GBMDVOWEEQVZKZ-UHFFFAOYSA-N 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000011087 paperboard Substances 0.000 description 1
- 238000003756 stirring Methods 0.000 description 1
- 238000012360 testing method Methods 0.000 description 1
- 238000012795 verification Methods 0.000 description 1
Images
Classifications
-
- 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
- G01N21/3554—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for determining moisture content
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N1/00—Sampling; Preparing specimens for investigation
- G01N1/28—Preparing specimens for investigation including physical details of (bio-)chemical methods covered elsewhere, e.g. G01N33/50, C12Q
- G01N1/44—Sample treatment involving radiation, e.g. heat
-
- 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
- G01N21/3577—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing liquids, e.g. polluted water
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- G01N5/00—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid
- G01N5/04—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder
- G01N5/045—Analysing materials by weighing, e.g. weighing small particles separated from a gas or liquid by removing a component, e.g. by evaporation, and weighing the remainder for determining moisture content
-
- 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
Landscapes
- Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Biochemistry (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
Abstract
The application discloses a method for rapidly measuring the water content of transformer insulation paper, which comprises the following steps: collecting an insulating paper sample with a certain weight, putting the insulating paper sample into a first microwave digestion tank filled with extract liquor, and setting the power and time of a microwave digestion instrument to perform microwave-assisted extraction; after the sample and the blank are cooled to room temperature in respective microwave digestion tanks, infrared spectrum detection is carried out on the moisture in the sample extraction liquid, and the moisture content omega in the extraction liquid is quantitatively calculatedExtracting liquid(ii) a Soaking and cleaning an insulating paper sample subjected to microwave-assisted extraction with petroleum ether, putting the insulating paper sample into a polyethylene weighing bottle which is dried in advance to constant weight, putting the polyethylene weighing bottle into a vacuum drying oven, heating the polyethylene weighing bottle for a preset time at a preset temperature value, and weighing the dry insulating paper sample by mass m;and calculating the water content of the insulating paper. The method greatly saves time cost, reduces measurement errors, has the characteristics of high efficiency, rapidness and environmental friendliness, and provides accurate criteria for transformer state evaluation and defect analysis.
Description
Technical Field
The application relates to the technical field of transformer insulation state assessment, in particular to a method for rapidly determining the water content of transformer insulation paper.
Background
The solid insulation of the transformer is a fibrous insulation material, wherein moisture can accelerate the aging of oil paper insulation and shorten the service life of the transformer, so that the accurate determination of the water content of the insulation paper (board) has important significance for the safe operation of the transformer. At present, the method of indirect evaluation and direct detection is mainly adopted for monitoring the moisture content in the transformer insulation paper.
The existing indirect evaluation method is mainly based on laboratory data, and the verification of field data is lacked. The moisture balance curve method obtains the average moisture content in the transformer insulation paper by obtaining a moisture distribution function in the transformer insulation paper, is only suitable for an insulation system consisting of new oil and new paper, and cannot calculate the moisture of the transformer insulation paper in operation. The dielectric response method cannot distinguish the influence of moisture and aging on the dielectric response curve, and is easily interfered when in field application. The existing standard method DL/T449 is a direct detection method calculated through insulation paper sample collection and laboratory analysis, the method is long in time consumption, the extraction process is greatly influenced by factors such as environmental temperature and humidity change, electromagnetic stirring consistency, insulation paper dissolution and the like, and meanwhile, the used Karl Fischer reagent has different degrees of harm to personnel and environment.
Disclosure of Invention
The invention aims to at least solve the technical problems in the prior art, and provides a method for rapidly measuring the water content of transformer insulation paper, which improves the existing standard method DL/T449, greatly saves time cost after improvement, reduces measurement errors, has the characteristics of high efficiency, rapidness and environmental friendliness, and provides an accurate criterion for transformer state evaluation and defect analysis.
The invention provides a method for rapidly measuring the water content of transformer insulation paper, which comprises the following steps:
collecting an insulating paper sample with a certain weight, putting the insulating paper sample into a first microwave digestion tank filled with an extraction liquid, preparing a second microwave digestion tank without the insulating paper sample, adding the extraction liquid which is the same as that in the first microwave digestion tank into the second microwave digestion tank as a blank, setting the power and time of a microwave digestion instrument for microwave-assisted extraction, wherein the extraction liquid is one of an acetonitrile pure solvent, a methanol pure solvent and an ethanol pure solvent;
after the sample and the blank are cooled to room temperature in respective microwave digestion tanks, infrared spectrum detection is carried out on the moisture in the sample extraction liquid, and the moisture content omega in the extraction liquid is quantitatively calculatedExtracting liquid；
Soaking and cleaning an insulating paper sample subjected to microwave-assisted extraction with petroleum ether, putting the insulating paper sample into a polyethylene weighing bottle which is dried in advance to constant weight, putting the polyethylene weighing bottle into a vacuum drying oven, heating the polyethylene weighing bottle for a preset time at a preset temperature value, and weighing the dry insulating paper sample by mass m;
and calculating the water content of the insulating paper.
The weight of the insulating paper sample is between 0.2g and 0.5 g.
The value of the extraction liquid in the first microwave digestion tank is any value between 20ml and 50 ml.
The preset temperature value is any value between 100 ℃ and 120 ℃, and the preset time is any value between 10 minutes and 30 minutes.
The infrared spectrum detection of the moisture in the sample extraction liquid comprises the following steps: and performing infrared spectrum detection on the moisture in the sample extraction liquid by Fourier transform infrared spectrum quantitative analysis.
The Fourier transform infrared spectrum quantitative analysis comprises the following steps:
s1, preparing a standard sample: respectively taking a proper amount of solvent, wherein the solvent is one of acetonitrile pure solvent, methanol pure solvent and dimethyl sulfoxide pure solvent, and respectively adding pure water to obtain: 0.2mg/ml, 0.5mg/ml, 1.0mg/ml, 2.0mg/ml, 3.0mg/ml of the corresponding solvent;
s2, drawing a standard curve: using a 500 μm CaF2 sample cell, the original spectrum S was recorded0Number of scans 32, resolution 4cm-1And the wave spectrum range is 4000-400 cm-1Recording the spectrum S _ std of series standard samples, and then carrying out spectrum subtraction operation, namely S _ std-S0Obtaining a difference spectrum series S _ dif, amplifying by 10000 times, and obtaining a difference spectrum at 1610cm-1The intensities of the left and right maximum absorption peaks correspond to H-O-H bending vibration, and the intensities are related to the water content to obtain a moisture standard curve of the corresponding extraction solvent;
s3, sample quantification: taking the extract in the blank as the blank SBlank spaceSample spectrum of SsObtaining a difference spectrum SdifThe difference spectrum is adjusted to 1610cm-1And substituting the left and right maximum absorption peak intensities into a moisture standard curve to calculate the moisture content of the sample extraction liquid.
The formula for calculating the water content is as follows:
compared with the prior art, the invention has the beneficial effects that: microwave-assisted extraction is adopted to realize rapid extraction of water in the insulating paper, FTIR spectroscopy is subsequently adopted to replace a Karl Fischer method to measure the water content of the extracted organic solvent, and meanwhile, the insulating paper is subjected to low-temperature vacuum drying, so that the time cost is greatly saved, the measurement error is reduced compared with the standard method, and the method has the characteristics of high efficiency, rapidness, accuracy and environmental friendliness.
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, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a flow chart of a method for rapidly determining moisture content of transformer insulation paper in an embodiment of the invention;
FIG. 2 is a graph showing a standard curve of water content of a standard extract in an example of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, 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 invention.
Example 1:
a method for rapidly determining the moisture content of transformer insulation paper comprises the following steps:
collecting an insulating paper sample with a certain weight, putting the insulating paper sample into a first microwave digestion tank filled with an extraction liquid, preparing a second microwave digestion tank without the insulating paper sample, adding the extraction liquid which is the same as that in the first microwave digestion tank into the second microwave digestion tank as a blank, setting the power and time of a microwave digestion instrument for microwave-assisted extraction, wherein the extraction liquid is one of an acetonitrile pure solvent, a methanol pure solvent and a dimethyl sulfoxide pure solvent;
after the sample and the blank are cooled to room temperature in respective microwave digestion tanks, carrying out infrared spectrum detection on the moisture in the sample extraction liquid, and quantitatively calculating the moisture content omega _ extraction liquid in the extraction liquid;
soaking and cleaning an insulating paper sample subjected to microwave-assisted extraction with petroleum ether, putting the insulating paper sample into a polyethylene weighing bottle which is dried in advance to constant weight, putting the polyethylene weighing bottle into a vacuum drying oven, heating the polyethylene weighing bottle for a preset time at a preset temperature value, and weighing the dry insulating paper sample by mass m;
and calculating the water content of the insulating paper.
Specifically, the weight of the insulation paper sample is between 0.2g and 0.5 g.
Specifically, the value of the extract in the first microwave digestion tank is any value between 20ml and 50 ml.
Specifically, the preset temperature value is any value between 100 ℃ and 120 ℃, and the preset time is any value between 10 minutes and 30 minutes.
Specifically, the infrared spectrum detection of the moisture in the sample extraction liquid comprises the following steps: and performing infrared spectrum detection on the moisture in the sample extraction liquid by Fourier transform infrared spectrum quantitative analysis.
Specifically, the Fourier transform infrared spectrum quantitative analysis comprises the following steps:
s1, preparing a standard sample: respectively taking a proper amount of solvent, wherein the solvent is one of acetonitrile pure solvent, methanol pure solvent and dimethyl sulfoxide pure solvent, and respectively adding pure water to obtain: 0.2mg/ml, 0.5mg/ml, 1.0mg/ml, 2.0mg/ml, 3.0mg/ml of the corresponding solvent;
s2, drawing a standard curve: using a 500 μm CaF2 sample cell, the original spectrum S was recorded0Number of scans 32, resolution 4cm-1And the wave spectrum range is 4000-400 cm-1Recording the spectrum S _ std of series standard samples, and then carrying out spectrum subtraction operation, namely S _ std-S0Obtaining a difference spectrum series S _ dif, amplifying by 10000 times, and obtaining a difference spectrum at 1610cm-1The intensities of the left and right maximum absorption peaks correspond to H-O-H bending vibration, and the intensities are related to the water content to obtain a moisture standard curve of the corresponding extraction solvent;
s3, sample quantification: taking the extract in the blank as the blank SBlank spaceSample spectrum of SsObtaining a difference spectrum SdifThe difference spectrum is adjusted to 1610cm-1And substituting the left and right maximum absorption peak intensities into a moisture standard curve to calculate the moisture content of the sample extraction liquid.
The formula for calculating the water content is as follows:
example 2:
the scanning range of the infrared spectrometer (Bruker; software: OPUS) adopted by the embodiment is 4000-400 cm-1。
The insulating paper boards tested in this example were obtained from 100, 85, and 1 layers of insulating paper of the same bushing solid insulation, and named as sample No. 1, sample No. 2, and sample No. 3.
Fig. 1 shows a flow chart of a method for rapidly measuring moisture content of transformer insulation paper in an embodiment of the invention, which comprises the following steps:
sample pretreatment: taking about 0.2g of No. 1, No. 2 and No. 3 samples respectively, and rapidly cutting into 5cm with scissors2Left and right fragments;
extracting moisture: respectively putting the samples into microwave digestion tanks, adding 20ml of methanol, preparing a microwave digestion tank without the samples, adding 20ml of extract liquor as a blank, and setting the power and time of a microwave digestion instrument to perform microwave-assisted extraction;
and (3) detecting the water content of the extract liquid: taking the blank extract as a background spectrum to obtain an infrared spectrogram of the sample, calculating through a difference spectrum, and substituting the result into a standard curve to respectively obtain the water contents of the extract of 0.33, 0.45 and 0.51 mg/ml;
drying the insulating paper: soaking and cleaning a sample in each digestion tank by using petroleum ether, then putting the sample into a weighing bottle with dried constant weight, drying the sample in vacuum at the temperature of 60 ℃ for 30 minutes, and then weighing the sample, wherein m1 is 0.3556g, m2 is 0.3721g, and m3 is 0.3384 g;
and (3) calculating the water content of the insulating paper:
ω1＝1.86％，ω2＝2.42％，ω3＝3.01％。
(ωpaper: moisture content,%, of insulating paper; omegaExtracting liquid: the moisture content of the extract liquid is as follows: mg/ml; m: quality of insulating paper, g)
Wherein the water content detection also comprises the steps of drawing an external standard curve:
s1: preparing water-methanol solution with water content of 0.2, 0.5, 1.0, 2.0 and 3.0 mg/ml;
s2: recording a methanol background spectrum S0, sequentially placing each quantitative standard sample into an infrared spectrometer for testing, and sequentially recording the spectrograms as Sstd1, Sstd2, Sstd3, Sstd4 and Sstd 5;
s3: obtaining a difference spectrum series S _ dif through spectrum subtraction operation Sstd-S0;
s4: for series of difference spectra S _ dif at 1610cm-1The intensity of the left and right maximum absorption peaks (H-O-H bending vibration) is correlated with the water content to obtain the moisture standard curve of the corresponding extraction solvent: water content
FIG. 2 shows a schematic diagram of a standard curve of water content of a standard extraction liquid in an embodiment of the present invention.
The method has the advantages that the rapid extraction of the water in the insulating paper is realized based on microwave-assisted extraction, the FTIR spectroscopy is subsequently adopted to replace the Karl Fischer method to measure the water content of the extracted organic solvent, and meanwhile, the insulating paper is subjected to low-temperature vacuum drying, so that the time cost is greatly saved, the measurement error is reduced, and the method has the characteristics of high efficiency, rapidness, accuracy and environmental friendliness.
The above embodiments of the present invention are described in detail, and the principle and the implementation manner of the present invention should be described herein by using specific embodiments, and the above description of the embodiments is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (7)
1. A method for rapidly measuring the moisture content of transformer insulation paper is characterized by comprising the following steps:
collecting an insulating paper sample with a certain weight, putting the insulating paper sample into a first microwave digestion tank filled with an extraction liquid, preparing a second microwave digestion tank without the insulating paper sample, adding the extraction liquid which is the same as that in the first microwave digestion tank into the second microwave digestion tank as a blank, setting the power and time of a microwave digestion instrument for microwave-assisted extraction, wherein the extraction liquid is one of an acetonitrile pure solvent, a methanol pure solvent and a dimethyl sulfoxide pure solvent;
after the sample and the blank are cooled to room temperature in respective microwave digestion tanks, infrared spectrum detection is carried out on the moisture in the sample extraction liquid, and the moisture content omega in the extraction liquid is quantitatively calculatedExtracting liquid；
Soaking and cleaning an insulating paper sample subjected to microwave-assisted extraction with petroleum ether, putting the insulating paper sample into a polyethylene weighing bottle which is dried in advance to constant weight, putting the polyethylene weighing bottle into a vacuum drying oven, heating the polyethylene weighing bottle for a preset time at a preset temperature value, and weighing the dry insulating paper sample by mass m;
and calculating the water content of the insulating paper.
2. The method for rapidly determining the moisture content of the insulation paper of the transformer as claimed in claim 1, wherein the weight of the insulation paper sample is between 0.2g and 0.5 g.
3. The method for rapidly measuring the water content of the transformer insulating paper as claimed in claim 2, wherein the value V of the extraction liquid in the first microwave digestion tank is any value between 20ml and 50 ml.
4. The method for rapidly measuring the moisture content of the transformer insulation paper as claimed in claim 3, wherein the preset temperature value is any value between 100 ℃ and 120 ℃, and the preset time is any value between 10 minutes and 30 minutes.
5. The method for rapidly measuring the moisture content of the transformer insulation paper as claimed in any one of claims 1 to 4, wherein the infrared spectrum detection of the moisture in the sample extraction liquid comprises the following steps: and performing infrared spectrum detection on the moisture in the sample extraction liquid by Fourier transform infrared spectrum quantitative analysis.
6. The method for rapidly determining the moisture content of the transformer insulation paper as claimed in claim 5, wherein the Fourier transform infrared spectrum quantitative analysis comprises:
s1, preparing a standard sample: respectively taking a proper amount of solvent, wherein the solvent is one of acetonitrile pure solvent, methanol pure solvent and dimethyl sulfoxide pure solvent, and respectively adding pure water to obtain: 0.2mg/ml, 0.5mg/ml, 1.0mg/ml, 2.0mg/ml, 3.0mg/ml of the corresponding solvent;
s2, drawing a standard curve: using 500. mu. CaF2Sample cell, recording raw spectrum S0Number of scans 32, resolution 4cm-1And the wave spectrum range is 4000-400 cm-1Recording the spectrum S _ std of series standard samples, and then carrying out spectrum subtraction operation, namely S _ std-S0Obtaining a difference spectrum series S _ dif, amplifying by 10000 times, and obtaining a difference spectrum at 1610cm-1The intensities of the left and right maximum absorption peaks correspond to H-O-H bending vibration, and the intensities are related to the water content to obtain a water standard curve of the corresponding extraction solvent;
s3, sample quantification: taking the extract in the blank as the blank SBlank spaceSample spectrum of SsObtaining a difference spectrum SdifThe difference spectrum is adjusted to 1610cm-1And substituting the left and right maximum absorption peak intensities into a moisture standard curve to calculate the moisture content of the sample extraction liquid.
7. The method for rapidly measuring the moisture content of the transformer insulation paper as claimed in claim 1, wherein the formula for calculating the moisture content is as follows:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011334279.9A CN112525849A (en) | 2020-11-24 | 2020-11-24 | Method for rapidly measuring water content of transformer insulation paper |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011334279.9A CN112525849A (en) | 2020-11-24 | 2020-11-24 | Method for rapidly measuring water content of transformer insulation paper |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN112525849A true CN112525849A (en) | 2021-03-19 |
Family
ID=74993352
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011334279.9A Pending CN112525849A (en) | 2020-11-24 | 2020-11-24 | Method for rapidly measuring water content of transformer insulation paper |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112525849A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088660A (en) * | 2021-11-10 | 2022-02-25 | 国网安徽省电力有限公司电力科学研究院 | Insulating paper water content evaluation method based on robust wavelength screening |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062746A (en) * | 2010-11-09 | 2011-05-18 | 西南交通大学 | Method for measuring oiled paper insulated micro water content on basis of dielectric response |
| CN102419308A (en) * | 2011-09-01 | 2012-04-18 | 浙江工业大学 | Method for analysis of trace moisture in edible oil through combination of solvent extraction and fourier transform infrared spectroscopy (FTIR) |
| CN105330124A (en) * | 2015-11-25 | 2016-02-17 | 东南大学 | Microwave radiation solvent extraction combination deep dehydration method and device applied to biological solid matter |
-
2020
- 2020-11-24 CN CN202011334279.9A patent/CN112525849A/en active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102062746A (en) * | 2010-11-09 | 2011-05-18 | 西南交通大学 | Method for measuring oiled paper insulated micro water content on basis of dielectric response |
| CN102419308A (en) * | 2011-09-01 | 2012-04-18 | 浙江工业大学 | Method for analysis of trace moisture in edible oil through combination of solvent extraction and fourier transform infrared spectroscopy (FTIR) |
| CN105330124A (en) * | 2015-11-25 | 2016-02-17 | 东南大学 | Microwave radiation solvent extraction combination deep dehydration method and device applied to biological solid matter |
Non-Patent Citations (1)
| Title |
|---|
| 能源部: "《中华人民共和国电力行业标准》" * |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114088660A (en) * | 2021-11-10 | 2022-02-25 | 国网安徽省电力有限公司电力科学研究院 | Insulating paper water content evaluation method based on robust wavelength screening |
| CN114088660B (en) * | 2021-11-10 | 2023-11-24 | 国网安徽省电力有限公司电力科学研究院 | Insulation paper water content evaluation method based on robust wavelength screening |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Saha et al. | Investigation of polarization and depolarization current measurements for the assessment of oil-paper insulation of aged transformers | |
| Wang et al. | Predicting C aromaticity of biochars based on their elemental composition | |
| CN111812467B (en) | Method for evaluating aging state of oil-impregnated transformer oil paper insulation system | |
| Saha et al. | Understanding the impacts of moisture and thermal ageing on transformer's insulation by dielectric response and molecular weight measurements | |
| CN105510469B (en) | The detection method of furfural content in a kind of transformer insulating paper | |
| CN106950468A (en) | The Reduction that transformer oil paper insulation frequency domain dielectric loss is integrated under a kind of different temperatures | |
| CN108680613A (en) | A method of assessing moisture in insulating paper using complex dielectric permittivity initial slope | |
| Hadjadj et al. | Potential of determining moisture content in mineral insulating oil by Fourier transform infrared spectroscopy | |
| CN112666116B (en) | Terahertz-based power transformer insulation paper aging detection device and method | |
| CN112525849A (en) | Method for rapidly measuring water content of transformer insulation paper | |
| Saldivar-Guerrero et al. | Quantitative analysis of ageing condition of insulating paper using infrared spectroscopy | |
| CN104596980A (en) | Method for measuring hot water solvends of reconstituted tobacco by paper-making process by virtue of near infrared reflectance spectroscopy technique | |
| CN112666232A (en) | Frequency domain dielectric response prediction method for oil-immersed cellulose insulating materials with different temperatures and humidities | |
| CN112269105A (en) | Moisture prediction and aging evaluation method for field bushing oil-immersed cellulose insulation | |
| Przybylek | A new method for indirect measurement of water content in fibrous electro-insulating materials using near-infrared spectroscopy | |
| Hyman et al. | Determination of acid soluble lignin concentration curve by UV-Vis spectroscopy | |
| CN114088660B (en) | Insulation paper water content evaluation method based on robust wavelength screening | |
| Yang et al. | A circuital model-based analysis of moisture content in oil-impregnated-paper insulation using frequency domain spectroscopy | |
| Xu et al. | Detection of dielectric constant of Pinus sylvestris Var. mongolica and its influencing factors | |
| De Maria et al. | Frequency dielectric spectroscopy and an innovative optical sensor to assess oil-paper degradation | |
| Neimanis et al. | Determination of moisture content in impregnated paper using near infrared spectroscopy | |
| CN112668145A (en) | FDS and exponential decay model-based transformer oiled paper insulation moisture assessment method | |
| Tamme | Development of control and optimization methods for wood drying | |
| Liang et al. | A Rapid Evaluation Method for Transformer Insulation Status | |
| Baird et al. | Non-destructive and in-situ analysis of insulating materials in high-voltage power transformers |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination |