CN109238994A - A kind of power equipment permeability detection method in the daytime - Google Patents
A kind of power equipment permeability detection method in the daytime Download PDFInfo
- Publication number
- CN109238994A CN109238994A CN201810987817.0A CN201810987817A CN109238994A CN 109238994 A CN109238994 A CN 109238994A CN 201810987817 A CN201810987817 A CN 201810987817A CN 109238994 A CN109238994 A CN 109238994A
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- 230000035699 permeability Effects 0.000 title claims abstract description 26
- 238000001514 detection method Methods 0.000 title claims abstract description 20
- 230000003287 optical effect Effects 0.000 claims abstract description 44
- 230000001105 regulatory effect Effects 0.000 claims abstract description 7
- 238000000034 method Methods 0.000 claims description 7
- 230000002902 bimodal effect Effects 0.000 claims description 6
- 238000003384 imaging method Methods 0.000 claims description 3
- 230000000877 morphologic effect Effects 0.000 claims description 3
- 238000010521 absorption reaction Methods 0.000 claims description 2
- 238000005259 measurement Methods 0.000 claims 3
- 229910017435 S2 In Inorganic materials 0.000 claims 1
- 238000009413 insulation Methods 0.000 description 2
- 230000032683 aging Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000009434 installation Methods 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
Classifications
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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
- G01N21/33—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using ultraviolet light
-
- 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
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- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- Biochemistry (AREA)
- Life Sciences & Earth Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Analytical Chemistry (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- General Physics & Mathematics (AREA)
- Immunology (AREA)
- Pathology (AREA)
- Investigating Or Analysing Materials By Optical Means (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Housings And Mounting Of Transformers (AREA)
Abstract
The present invention relates to a kind of power equipment permeability detection methods in the daytime.The ultraviolet source of a given ultraviolet light, provides a set of optical path switching device, light source output path is enabled to switch between A optical path and B optical path；It is switched to A optical path, ultraviolet source is adjusted to brightness M by the bandpass filter through wavelength for 335nm to 345nm, then by light intensity regulating optical filter A；The ultraviolet light that A optical path is emitted irradiates object under test, and installs optical filter additional before ultraviolet-cameras camera lens and filter out the visible light that wavelength is greater than 390nm, shoots the ultraviolet image A of object under test；Equally, it is switched to B optical path, obtains ultraviolet image B；Ultraviolet image B grayscale image is subtracted into ultraviolet image A grayscale image, histogram equalization is being carried out to increase contrast, is obtaining image D, can determine whether power equipment with the presence or absence of permeability by image D.The present invention quickly and accurately can carry out permeability detection in the daytime.
Description
Technical field
The invention belongs to electric system live detection field, in particular to a kind of power equipment permeability detection method in the daytime.
Background technique
Transformer, capacitor, voltage transformer, current transformer are all to use transformer oil as insulation in power equipment
Medium.When generating gas there are discharge fault point inside sealing rubber pad aging and outside air temperature humidity change dramatically, equipment,
Leakage of oil will occur.If leakage of oil is not found in time, will lead to equipment appearance it is dirty, insulation reduce, if oil-filled set
There are discharge faults for standby inside, and processing will lead to major accident not in time.
Electric system at present relies primarily on naked-eye observation permeability, lacks effective technological means.It can use purple at night
Outside line lamp fluorescent effect carries out permeability detection, but permeability detection technique does not still have in the daytime.
Summary of the invention
The purpose of the present invention is to provide a kind of power equipment permeability detection methods in the daytime, can be quickly and accurately in the daytime
Carry out permeability detection.
To achieve the above object, the technical scheme is that a kind of power equipment permeability detection method in the daytime, including such as
Lower step,
Step S1: given one can issue to steady and continuous the ultraviolet source that wavelength includes 330nm to 400nm ultraviolet light, provide
A set of optical path switching device enables to light source output path to switch between A optical path and B optical path；
Step S2: it is switched to A optical path, ultraviolet source is by the bandpass filter through wavelength for 335nm to 345nm, then passes through
Light intensity regulating optical filter A is adjusted to brightness M；
Step S3: the ultraviolet light that A optical path is emitted irradiates object under test, and installs optical filter additional before ultraviolet-cameras camera lens and filter out wave
The long visible light for being greater than 390nm, shoots the ultraviolet image A of object under test；
Step S4: it is switched to B optical path, ultraviolet source is by the bandpass filter through wavelength for 375nm to 385nm, then passes through
Light intensity regulating optical filter B is adjusted to brightness M；
Step S5: the ultraviolet light that B optical path is emitted irradiates object under test, and installs optical filter additional before ultraviolet-cameras camera lens and filter out wave
The long visible light for being greater than 390nm, shoots the ultraviolet image B of object under test；
Step S6: subtracting ultraviolet image A grayscale image for ultraviolet image B grayscale image, obtain new gray level image C, carries out to image C
Histogram equalization obtains image D to increase contrast；
Step S7: if the histogram of image D has significantly bimodal, i.e., wherein a peak is smaller, illustrate power equipment there are permeability,
Setting threshold value is bimodal midpoint, and pixel gray value is greater than threshold value reservation, sets less than threshold value black, drawing its profile is permeability area
Domain.
In an embodiment of the present invention, in the step S2, the ultraviolet light of 335nm to 345nm is that transformer oil is most preferably inhaled
Receive wavelength.
In an embodiment of the present invention, in the step S4, the ultraviolet light transformer oil of 375nm to 385nm absorbs unknown
It is aobvious.
In an embodiment of the present invention, in the step S5, installation optical filter filters out wavelength and is greater than before ultraviolet-cameras camera lens
The visible light of 390nm can prevent stronger visible light from participating in imaging, and detection is caused to fail.
In an embodiment of the present invention, in the step S6, by carrying out calculus of differences to two gray level images and passing through
The method of histogram equalization can distinguish the subtle regional luminance difference of two figures.
In an embodiment of the present invention, in the step S7, permeability region is judged whether there is by histogram morphological analysis,
Avoid the error of human eye analysis.
Compared to the prior art, the invention has the following advantages:
1, the present invention can carry out in the daytime permeability detection；
2, present invention detection speed is fast, and precision is higher.
Detailed description of the invention
Fig. 1 is implementation flow chart of the invention.
Specific embodiment
With reference to the accompanying drawing, technical solution of the present invention is specifically described.
As shown in Figure 1, include the following steps the present invention provides a kind of power equipment permeability detection method in the daytime,
Step S1: given one can issue to steady and continuous the ultraviolet source that wavelength includes 330nm to 400nm ultraviolet light, provide
A set of optical path switching device enables to light source output path to switch between A optical path and B optical path；
Step S2: it is switched to A optical path, ultraviolet source is by the bandpass filter through wavelength for 335nm to 345nm, then passes through
Light intensity regulating optical filter A is adjusted to brightness M；
Step S3: the ultraviolet light that A optical path is emitted irradiates object under test, and installs optical filter additional before ultraviolet-cameras camera lens and filter out wave
The long visible light for being greater than 390nm, shoots the ultraviolet image A of object under test；
Step S4: it is switched to B optical path, ultraviolet source is by the bandpass filter through wavelength for 375nm to 385nm, then passes through
Light intensity regulating optical filter B is adjusted to brightness M；
Step S5: the ultraviolet light that B optical path is emitted irradiates object under test, and installs optical filter additional before ultraviolet-cameras camera lens and filter out wave
The long visible light for being greater than 390nm, shoots the ultraviolet image B of object under test；
Step S6: subtracting ultraviolet image A grayscale image for ultraviolet image B grayscale image, obtain new gray level image C, carries out to image C
Histogram equalization obtains image D to increase contrast；
Step S7: if the histogram of image D has significantly bimodal, i.e., wherein a peak is smaller, illustrate power equipment there are permeability,
Setting threshold value is bimodal midpoint, and pixel gray value is greater than threshold value reservation, sets less than threshold value black, drawing its profile is permeability area
Domain.
In the step S2, the ultraviolet light of 335nm to 345nm is transformer oil optimal absorption wavelength.In the step S4,
The ultraviolet light transformer oil of 375nm to 385nm absorbs unobvious.
It installs optical filter in the step S5, before ultraviolet-cameras camera lens additional and filters out the visible light that wavelength is greater than 390nm, it can be to prevent
Only stronger visible light participates in imaging, and detection is caused to fail.
In the step S6, by carrying out calculus of differences to two gray level images and by the method for histogram equalization,
The subtle regional luminance difference of two figures can be distinguished.
In the step S7, permeability region is judged whether there is by histogram morphological analysis, avoids the mistake of human eye analysis
Difference.
The above are preferred embodiments of the present invention, all any changes made according to the technical solution of the present invention, and generated function is made
When with range without departing from technical solution of the present invention, all belong to the scope of protection of the present invention.
Claims (6)
1. a kind of power equipment permeability detection method in the daytime, which is characterized in that include the following steps,
Step S1: given one can issue to steady and continuous the ultraviolet source that wavelength includes 330nm to 400nm ultraviolet light, provide
A set of optical path switching device enables to light source output path to switch between A optical path and B optical path；
Step S2: it is switched to A optical path, ultraviolet source is by the bandpass filter through wavelength for 335nm to 345nm, then passes through
Light intensity regulating optical filter A is adjusted to brightness M；
Step S3: the ultraviolet light that A optical path is emitted irradiates object under test, and installs optical filter additional before ultraviolet-cameras camera lens and filter out wave
The long visible light for being greater than 390nm, shoots the ultraviolet image A of object under test；
Step S4: it is switched to B optical path, ultraviolet source is by the bandpass filter through wavelength for 375nm to 385nm, then passes through
Light intensity regulating optical filter B is adjusted to brightness M；
Step S5: the ultraviolet light that B optical path is emitted irradiates object under test, and installs optical filter additional before ultraviolet-cameras camera lens and filter out wave
The long visible light for being greater than 390nm, shoots the ultraviolet image B of object under test；
Step S6: subtracting ultraviolet image A grayscale image for ultraviolet image B grayscale image, obtain new gray level image C, carries out to image C
Histogram equalization obtains image D to increase contrast；
Step S7: if the histogram of image D has significantly bimodal, i.e., wherein a peak is smaller, illustrate power equipment there are permeability,
Setting threshold value is bimodal midpoint, and pixel gray value is greater than threshold value reservation, sets less than threshold value black, drawing its profile is permeability area
Domain.
2. a kind of power equipment permeability according to claim 1 detection method in the daytime, which is characterized in that the step S2
In, the ultraviolet light of 335nm to 345nm is transformer oil optimal absorption wavelength.
3. a kind of power equipment permeability according to claim 1 detection method in the daytime, it is characterised in that: the step S4
In, the ultraviolet light transformer oil of 375nm to 385nm absorbs unobvious.
4. the method for two o'clock distance in the non-contact quick measurement space of one kind according to claim 1, it is characterised in that: institute
State in step S5, before ultraviolet-cameras camera lens install additional optical filter filter out wavelength be greater than 390nm visible light, can prevent it is stronger can
Light-exposed participation imaging, causes detection to fail.
5. the method for two o'clock distance in the non-contact quick measurement space of one kind according to claim 1, it is characterised in that: institute
It states in step S6, it, can be by two figures by carrying out calculus of differences to two gray level images and by the method for histogram equalization
Subtle regional luminance difference distinguishes.
6. the method for two o'clock distance in the non-contact quick measurement space of one kind according to claim 1, it is characterised in that: institute
It states in step S7, permeability region is judged whether there is by histogram morphological analysis, avoid the error of human eye analysis.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987817.0A CN109238994B (en) | 2018-08-28 | 2018-08-28 | Oil leakage daytime detection method for electrical equipment |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810987817.0A CN109238994B (en) | 2018-08-28 | 2018-08-28 | Oil leakage daytime detection method for electrical equipment |
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| CN109238994A true CN109238994A (en) | 2019-01-18 |
| CN109238994B CN109238994B (en) | 2021-01-29 |
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| CN201810987817.0A Active CN109238994B (en) | 2018-08-28 | 2018-08-28 | Oil leakage daytime detection method for electrical equipment |
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Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN110174222A (en) * | 2019-07-03 | 2019-08-27 | 云南电网有限责任公司电力科学研究院 | A kind of oil immersed type capacitor leakage of oil detection device and method |
| CN110174220A (en) * | 2019-07-03 | 2019-08-27 | 云南电网有限责任公司电力科学研究院 | A kind of on-load tap changers of transformers leakage of oil detection system and method |
| CN110174221A (en) * | 2019-07-03 | 2019-08-27 | 云南电网有限责任公司电力科学研究院 | A kind of transformer body leakage of oil status monitoring appraisal procedure and system |
| CN111784629A (en) * | 2020-05-15 | 2020-10-16 | 华能国际电力股份有限公司海门电厂 | Oil leakage detection method and system |
| CN114062224A (en) * | 2021-11-19 | 2022-02-18 | 广东电网有限责任公司广州供电局 | Oil leakage oil detection system and method for oil-immersed power equipment |
| CN114659716A (en) * | 2022-02-16 | 2022-06-24 | 中国电子科技集团公司第十一研究所 | Medium wave infrared registration differential imaging monitoring system for crude oil leakage |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN110174222A (en) * | 2019-07-03 | 2019-08-27 | 云南电网有限责任公司电力科学研究院 | A kind of oil immersed type capacitor leakage of oil detection device and method |
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| CN110174221A (en) * | 2019-07-03 | 2019-08-27 | 云南电网有限责任公司电力科学研究院 | A kind of transformer body leakage of oil status monitoring appraisal procedure and system |
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| CN114062224A (en) * | 2021-11-19 | 2022-02-18 | 广东电网有限责任公司广州供电局 | Oil leakage oil detection system and method for oil-immersed power equipment |
| CN114659716A (en) * | 2022-02-16 | 2022-06-24 | 中国电子科技集团公司第十一研究所 | Medium wave infrared registration differential imaging monitoring system for crude oil leakage |
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