CN109238994B - Oil leakage daytime detection method for electrical equipment - Google Patents
Oil leakage daytime detection method for electrical equipment Download PDFInfo
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- CN109238994B CN109238994B CN201810987817.0A CN201810987817A CN109238994B CN 109238994 B CN109238994 B CN 109238994B CN 201810987817 A CN201810987817 A CN 201810987817A CN 109238994 B CN109238994 B CN 109238994B
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- 230000003287 optical effect Effects 0.000 claims abstract description 18
- 238000006243 chemical reaction Methods 0.000 claims abstract description 7
- 230000001678 irradiating effect Effects 0.000 claims abstract description 7
- 238000010521 absorption reaction Methods 0.000 claims description 6
- 230000000740 bleeding effect Effects 0.000 claims 1
- 238000000034 method Methods 0.000 abstract description 2
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- 238000003384 imaging method Methods 0.000 description 2
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- 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
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- 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
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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
- G01N21/3577—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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Abstract
The invention relates to a method for detecting oil leakage of electrical equipment in daytime. Providing an ultraviolet light source of ultraviolet light, and providing a set of light path conversion device, so that the output path of the light source can be switched between an A light path and a B light path; switching to an optical path A, and adjusting the ultraviolet light source to the brightness M through a light intensity adjusting optical filter A by passing through a band-pass optical filter with the wavelength of 335nm to 345 nm; irradiating the object to be detected with the ultraviolet rays emitted from the optical path A, additionally arranging a filter in front of an ultraviolet camera lens to filter visible light with the wavelength of more than 390nm, and shooting an ultraviolet image A of the object to be detected; similarly, switching to a light path B to obtain an ultraviolet image B; and subtracting the ultraviolet image A grey-scale image from the ultraviolet image B grey-scale image, carrying out histogram equalization to increase contrast to obtain an image D, and judging whether the electrical equipment has oil leakage or not through the image D. The invention can quickly and accurately detect the oil leakage in the daytime.
Description
Technical Field
The invention belongs to the field of electrified detection of power systems, and particularly relates to a daytime detection method for oil leakage of power equipment.
Background
In the power equipment, a transformer, a capacitor, a voltage transformer and a current transformer all use transformer oil as an insulating medium. When the sealing rubber gasket is aged, the outside air temperature and humidity change rapidly, and a discharge fault point exists in the equipment to generate gas, oil leakage can occur. If the oil leakage is not found in time, the appearance of the oil filling equipment is dirty, the insulation is reduced, and if the discharge fault exists in the oil filling equipment, serious accidents are caused if the discharge fault is not processed in time.
At present, an electric power system mainly depends on visual observation of oil leakage, and an effective technical means is lacked. The oil leakage detection can be carried out by using the fluorescent effect of an ultraviolet lamp at night, but the daytime oil leakage detection technology is still not available.
Disclosure of Invention
The invention aims to provide a daytime detection method for oil leakage of electric equipment, which can quickly and accurately detect the oil leakage in the daytime.
In order to achieve the purpose, the technical scheme of the invention is as follows: a daytime detection method for oil leakage of electrical equipment comprises the following steps,
step S1: providing an ultraviolet light source capable of stably and continuously emitting ultraviolet light with the wavelength of 330nm to 400nm, and providing a set of light path conversion device, wherein the light path conversion device can enable the output path of the light source to be switched between an A light path and a B light path;
step S2: switching to an optical path A, and adjusting the ultraviolet light source to the brightness M through a light intensity adjusting optical filter A by passing through a band-pass optical filter with the wavelength of 335nm to 345 nm;
step S3: irradiating the object to be detected with the ultraviolet rays emitted from the optical path A, additionally arranging a filter in front of an ultraviolet camera lens to filter visible light with the wavelength of more than 390nm, and shooting an ultraviolet image A of the object to be detected;
step S4: switching to a light path B, and adjusting the ultraviolet light source to the brightness M through a light intensity adjusting filter B by passing through a band-pass filter with the wavelength of 375nm to 385 nm;
step S5: irradiating the object to be detected with the ultraviolet rays emitted from the light path B, additionally arranging a filter in front of an ultraviolet camera lens to filter visible light with the wavelength of more than 390nm, and shooting an ultraviolet image B of the object to be detected;
step S6: subtracting the ultraviolet image A grey-scale image from the ultraviolet image B grey-scale image to obtain a new grey-scale image C, and performing histogram equalization on the image C to increase contrast to obtain an image D;
step S7: if the histogram of the image D has obvious double peaks, namely one peak is small, the oil leakage of the power equipment is indicated, the threshold value is set to be the middle point of the double peaks, the gray value of the pixel point is larger than the threshold value and is reserved, the pixel point is set to be black when the gray value is smaller than the threshold value, and the outline is drawn to be the oil leakage area.
In an embodiment of the invention, in the step S2, the ultraviolet light of 335nm to 345nm is the optimal absorption wavelength of the transformer oil.
In an embodiment of the invention, in the step S4, the absorption of the ultraviolet transformer oil from 375nm to 385nm is not significant.
In an embodiment of the present invention, in step S5, an optical filter is additionally installed in front of the ultraviolet camera lens to filter out visible light with a wavelength greater than 390nm, so that strong visible light can be prevented from participating in imaging and causing detection failure.
In an embodiment of the present invention, in step S6, the two grayscale images are subjected to a difference operation, and a histogram equalization method is used to distinguish a slight difference in regional brightness between the two grayscale images.
In an embodiment of the present invention, in the step S7, it is determined whether there is an oil-bleeding region through histogram morphological analysis, so as to avoid an error of human eye analysis.
Compared with the prior art, the invention has the following beneficial effects:
1. the invention can carry out oil leakage detection in the daytime;
2. the invention has the advantages of high detection speed and high precision.
Drawings
FIG. 1 is a flow chart of an implementation of the present invention.
Detailed Description
The technical scheme of the invention is specifically explained below with reference to the accompanying drawings.
As shown in FIG. 1, the invention provides a daytime detection method for oil leakage of electrical equipment, which comprises the following steps,
step S1: providing an ultraviolet light source capable of stably and continuously emitting ultraviolet light with the wavelength of 330nm to 400nm, and providing a set of light path conversion device, wherein the light path conversion device can enable the output path of the light source to be switched between an A light path and a B light path;
step S2: switching to an optical path A, and adjusting the ultraviolet light source to the brightness M through a light intensity adjusting optical filter A by passing through a band-pass optical filter with the wavelength of 335nm to 345 nm;
step S3: irradiating the object to be detected with the ultraviolet rays emitted from the optical path A, additionally arranging a filter in front of an ultraviolet camera lens to filter visible light with the wavelength of more than 390nm, and shooting an ultraviolet image A of the object to be detected;
step S4: switching to a light path B, and adjusting the ultraviolet light source to the brightness M through a light intensity adjusting filter B by passing through a band-pass filter with the wavelength of 375nm to 385 nm;
step S5: irradiating the object to be detected with the ultraviolet rays emitted from the light path B, additionally arranging a filter in front of an ultraviolet camera lens to filter visible light with the wavelength of more than 390nm, and shooting an ultraviolet image B of the object to be detected;
step S6: subtracting the ultraviolet image A grey-scale image from the ultraviolet image B grey-scale image to obtain a new grey-scale image C, and performing histogram equalization on the image C to increase contrast to obtain an image D;
step S7: if the histogram of the image D has obvious double peaks, namely one peak is small, the oil leakage of the power equipment is indicated, the threshold value is set to be the middle point of the double peaks, the gray value of the pixel point is larger than the threshold value and is reserved, the pixel point is set to be black when the gray value is smaller than the threshold value, and the outline is drawn to be the oil leakage area.
In step S2, ultraviolet rays from 335nm to 345nm are the optimal absorption wavelength of the transformer oil. In the step S4, the absorption of the ultraviolet transformer oil from 375nm to 385nm is not obvious.
In step S5, an optical filter is added in front of the ultraviolet camera lens to filter out visible light with a wavelength greater than 390nm, so that strong visible light can be prevented from participating in imaging and causing detection failure.
In step S6, the two grayscale images are subjected to a difference operation and histogram equalization, so that a slight difference in regional brightness between the two grayscale images can be distinguished.
In step S7, it is determined whether there is an oil-bleeding region by histogram morphological analysis, thereby avoiding an error in human eye analysis.
The above are preferred embodiments of the present invention, and all changes made according to the technical scheme of the present invention that produce functional effects do not exceed the scope of the technical scheme of the present invention belong to the protection scope of the present invention.
Claims (3)
1. A daytime detection method for oil leakage of electrical equipment is characterized by comprising the following steps,
step S1: providing an ultraviolet light source capable of stably and continuously emitting ultraviolet light with the wavelength of 330nm to 400nm, and providing a set of light path conversion device, wherein the light path conversion device can enable the output path of the light source to be switched between an A light path and a B light path;
step S2: switching to an optical path A, and adjusting the ultraviolet light source to the brightness M through a light intensity adjusting optical filter A by passing through a band-pass optical filter with the wavelength of 335nm to 345 nm;
step S3: irradiating the object to be detected with the ultraviolet rays emitted from the optical path A, additionally arranging a filter in front of an ultraviolet camera lens to filter visible light with the wavelength of more than 390nm, and shooting an ultraviolet image A of the object to be detected;
step S4: switching to a light path B, and adjusting the ultraviolet light source to the brightness M through a light intensity adjusting filter B by passing through a band-pass filter with the wavelength of 375nm to 385 nm;
step S5: irradiating the object to be detected with the ultraviolet rays emitted from the light path B, additionally arranging a filter in front of an ultraviolet camera lens to filter visible light with the wavelength of more than 390nm, and shooting an ultraviolet image B of the object to be detected;
step S6: subtracting the ultraviolet image A grey-scale image from the ultraviolet image B grey-scale image to obtain a new grey-scale image C, and performing histogram equalization on the image C to increase contrast to obtain an image D;
step S7: if the histogram of the image D has obvious double peaks, and one peak is small, oil leakage exists in the power equipment, the threshold value is set to be the middle point of the double peaks, the gray value of the pixel point is larger than the threshold value and is reserved, the pixel point is darkened when the gray value is smaller than the threshold value, and the outline is drawn to be the oil leakage area.
2. The daytime detection method for oil leakage of electric power equipment according to claim 1, wherein in step S2, ultraviolet rays from 335nm to 345nm are the optimal absorption wavelength of transformer oil.
3. The electric power equipment oil bleeding daytime detection method according to claim 1, characterized in that: in the step S4, the absorption of the ultraviolet transformer oil from 375nm to 385nm is not obvious.
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| CN201810987817.0A CN109238994B (en) | 2018-08-28 | 2018-08-28 | Oil leakage daytime detection method for electrical equipment |
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| CN201810987817.0A CN109238994B (en) | 2018-08-28 | 2018-08-28 | Oil leakage daytime detection method for electrical equipment |
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| CN109238994B true CN109238994B (en) | 2021-01-29 |
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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 |
| CN111784629B (en) * | 2020-05-15 | 2024-03-19 | 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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| EP2511611A1 (en) * | 2003-03-07 | 2012-10-17 | Shikoku Research Institute Incorporated | Hydrogen flame monitoring method and system |
| JP2008116389A (en) * | 2006-11-07 | 2008-05-22 | Hitachi Ltd | Nondestructive corrosion diagnostic system for leakage oil of electrical apparatus |
| WO2012021753A2 (en) * | 2010-08-11 | 2012-02-16 | Flir Systems, Inc. | Infrared camera detection systems and methods |
| CN102692402A (en) * | 2012-06-21 | 2012-09-26 | 烟台森科特智能仪器有限公司 | Detection method and sensor for oil type pollutants |
| CN104616303B (en) * | 2015-02-11 | 2018-01-26 | 西安电子科技大学 | A kind of spilled oil on water surface detecting system and method based on ultraviolet image |
| JP6498552B2 (en) * | 2015-07-15 | 2019-04-10 | 株式会社日立製作所 | Oil leak detection system |
| CN106340034B (en) * | 2016-08-22 | 2019-01-29 | 成都信息工程大学 | A kind of transformer Oil Leakage Detecting method |
| CN206223654U (en) * | 2016-11-30 | 2017-06-06 | 国网福建省电力有限公司 | It is a kind of can rapid identification transformer station oiling equipment permeability device |
| CN206657463U (en) * | 2017-02-28 | 2017-11-21 | 中国石油化工股份有限公司 | A kind of water-surface oil spilling monitoring pre-alarming control system based on ultraviolet reflectance |
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