CN108061847A - Dry-type reactor epoxy resin insulating medium cracking detection method - Google Patents
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- 239000003822 epoxy resin Substances 0.000 title claims abstract description 52
- 229920000647 polyepoxide Polymers 0.000 title claims abstract description 52
- 238000001514 detection method Methods 0.000 title claims abstract description 33
- 238000005336 cracking Methods 0.000 title claims abstract description 20
- 238000009413 insulation Methods 0.000 claims abstract description 45
- 238000000034 method Methods 0.000 claims abstract description 9
- 238000005070 sampling Methods 0.000 claims abstract description 4
- 238000013178 mathematical model Methods 0.000 claims description 3
- 230000011218 segmentation Effects 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 5
- 238000011160 research Methods 0.000 abstract description 2
- 238000005516 engineering process Methods 0.000 description 5
- 230000015556 catabolic process Effects 0.000 description 4
- 238000009826 distribution Methods 0.000 description 3
- 230000005855 radiation Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 230000006866 deterioration Effects 0.000 description 2
- 238000003331 infrared imaging Methods 0.000 description 2
- 239000011810 insulating material Substances 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000001228 spectrum Methods 0.000 description 2
- 208000034693 Laceration Diseases 0.000 description 1
- 235000006650 Syzygium cordatum Nutrition 0.000 description 1
- 240000005572 Syzygium cordatum Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000000712 assembly Effects 0.000 description 1
- 238000000429 assembly Methods 0.000 description 1
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000009529 body temperature measurement Methods 0.000 description 1
- 238000005266 casting Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 210000001787 dendrite Anatomy 0.000 description 1
- 238000011161 development Methods 0.000 description 1
- 230000018109 developmental process Effects 0.000 description 1
- 238000003745 diagnosis Methods 0.000 description 1
- 238000010292 electrical insulation Methods 0.000 description 1
- 230000005284 excitation Effects 0.000 description 1
- 230000020169 heat generation Effects 0.000 description 1
- 238000010438 heat treatment Methods 0.000 description 1
- 238000003384 imaging method Methods 0.000 description 1
- 239000012212 insulator Substances 0.000 description 1
- 230000007774 longterm Effects 0.000 description 1
- 238000004020 luminiscence type Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 229920000620 organic polymer Polymers 0.000 description 1
- 229910052760 oxygen Inorganic materials 0.000 description 1
- 239000001301 oxygen Substances 0.000 description 1
- 230000035515 penetration Effects 0.000 description 1
- 239000002861 polymer material Substances 0.000 description 1
- 239000011148 porous material Substances 0.000 description 1
- 230000003449 preventive effect Effects 0.000 description 1
- 230000006798 recombination Effects 0.000 description 1
- 238000005215 recombination Methods 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 230000003595 spectral effect Effects 0.000 description 1
- 238000001931 thermography Methods 0.000 description 1
- 238000000825 ultraviolet detection Methods 0.000 description 1
- 238000002211 ultraviolet spectrum Methods 0.000 description 1
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/12—Testing dielectric strength or breakdown voltage ; Testing or monitoring effectiveness or level of insulation, e.g. of a cable or of an apparatus, for example using partial discharge measurements; Electrostatic testing
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Abstract
本发明公开了一种干式电抗器环氧树脂绝缘介质开裂检测方法，该方法为在线检测方法，其包括建立图像阈值信息数据库和干式电抗器环氧树脂绝缘介质开裂检测两大步骤：a、建立图像阈值信息数据库，对所采集的放电阈值源数据信息和温度阈值源数据信息转换放电图像阈值数据信息和温度图像阈值数据信息；b、干式电抗器环氧树脂绝缘介质开裂检测，包括以下步骤：图像信息取样；在图像中的轮廓重合部分即可判断为干式电抗器环氧树脂绝缘介质开裂位置，如果放电图像信息和高温图像信息未对比出轮廓重合部分即可判断为干式电抗器环氧树脂绝缘介质未开裂。本发明具有测试效率高，可靠性强，适合工程检测和科学研究，具有较高的应用价值。
The invention discloses a method for detecting cracking of an epoxy resin insulating medium of a dry-type reactor. The method is an online detection method, which includes two steps of establishing an image threshold information database and detecting cracking of an epoxy resin insulating medium of a dry-type reactor: a 1. Establish an image threshold information database, and convert the collected discharge threshold source data information and temperature threshold source data information into discharge image threshold data information and temperature image threshold data information; b. Dry-type reactor epoxy resin insulation medium crack detection, including The following steps: image information sampling; the overlapping part of the contour in the image can be judged as the cracking position of the epoxy resin insulation medium of the dry-type reactor. If the discharge image information and the high-temperature image information are not compared, the contour overlapping part can be judged as dry The epoxy resin insulation medium of the reactor is not cracked. The invention has high testing efficiency and strong reliability, is suitable for engineering testing and scientific research, and has high application value.
Description
技术领域technical field
本发明涉及环氧树脂绝缘介质开裂检测技术领域。The invention relates to the technical field of crack detection of epoxy resin insulating medium.
背景技术Background technique
环氧树脂等聚合类有机高分子材料由于具有良好的电气绝缘性能，可塑性好，方便加工等特点，逐步取代了天然绝缘介质，成为了重要的电工绝缘材料。环氧树脂已广泛应用于电机、电器、电子组合件以及千伏高压输电变压器等绝缘部件的浇注，尤其是在电流互感器、电压互感器、干式变压器、GIS、电缆接线盒中得到了广泛应用。Polymeric organic polymer materials such as epoxy resin have gradually replaced natural insulating media and become important electrical insulating materials due to their good electrical insulation properties, good plasticity, and convenient processing. Epoxy resin has been widely used in the casting of insulating parts such as motors, electrical appliances, electronic assemblies, and kilovolt high-voltage transmission transformers, especially in current transformers, voltage transformers, dry-type transformers, GIS, and cable junction boxes. application.
随着电网传输容量的不断增大，电压等级的逐步升高，对各种电力设备运行的安全性和可靠性要求越来越高，干式电抗器也大量应用在电力系统中。但在长期运行过程中，尤其是恶劣天气条件下，干式电抗器绝缘材料极易发生绝缘开裂，产生大量的水树，水树最终转化为电树，进而诱发绝缘击穿事故，严重影响电力系统安全可靠运行。With the continuous increase of the transmission capacity of the power grid and the gradual increase of the voltage level, the requirements for the safety and reliability of various power equipment operations are getting higher and higher, and dry-type reactors are also widely used in power systems. However, during long-term operation, especially under severe weather conditions, the insulating material of dry-type reactors is prone to insulation cracking, resulting in a large number of water trees, which eventually transform into electrical trees, which in turn induces insulation breakdown accidents and seriously affects the power supply. The system operates safely and reliably.
已有研究表明，绝缘开裂是导致树枝化放电进而诱发绝缘击穿事故的主要原因。因此，为了减少甚至避免干式电抗器在运行期间产生击穿事故，需要对其进行开裂检查，进而在开裂初期就消除安全隐患。Existing studies have shown that insulation cracking is the main cause of dendrite discharge and insulation breakdown accidents. Therefore, in order to reduce or even avoid breakdown accidents of dry-type reactors during operation, it is necessary to check for cracks, so as to eliminate potential safety hazards in the early stages of cracking.
发明内容Contents of the invention
本发明要解决的技术问题是提供一种干式电抗器环氧树脂绝缘介质开裂检测方法，它具有便于操作、检测准确率高等特点。The technical problem to be solved by the present invention is to provide a dry-type reactor epoxy resin insulation medium crack detection method, which has the characteristics of easy operation and high detection accuracy.
为解决上述技术问题，本发明所采取的技术方案是：In order to solve the problems of the technologies described above, the technical solution adopted in the present invention is:
一种干式电抗器环氧树脂绝缘介质开裂检测方法，该方法为在线检测方法，其包括建立图像阈值信息数据库和干式电抗器环氧树脂绝缘介质开裂检测两大步骤：A dry-type reactor epoxy resin insulation medium crack detection method, the method is an online detection method, which includes the establishment of an image threshold information database and dry-type reactor epoxy resin insulation medium crack detection two steps:
a、建立图像阈值信息数据库，图像阈值信息数据库包括放电图像阈值数据信息和温度图像阈值数据信息，放电图像阈值数据信息和温度图像阈值数据信息的取得方法包括以下步骤：a. Establish an image threshold information database, the image threshold information database includes discharge image threshold data information and temperature image threshold data information, and the method for obtaining the discharge image threshold data information and temperature image threshold data information includes the following steps:
a)、通过紫外成像仪和红外成像仪分别在不同温湿度和光强度下对开裂的环氧树脂绝缘介质进行图像采集，得到不同温湿度和光强度下的紫外图像和红外图像；a) Collecting images of the cracked epoxy resin insulation medium under different temperature, humidity and light intensities by means of an ultraviolet imager and an infrared imager, respectively, to obtain ultraviolet images and infrared images under different temperature, humidity and light intensities;
b)、对所采集的紫外图像和红外图像中所对应的环氧树脂绝缘介质开裂部位像素进行提取，在紫外图像中所提取的像素为放电阈值源数据信息，在红外图像中所提取的像素为温度阈值源数据信息；b) Extract the pixels of the epoxy resin insulating medium cracking part corresponding to the collected ultraviolet image and infrared image. The pixel extracted in the ultraviolet image is the discharge threshold source data information, and the pixel extracted in the infrared image is the temperature threshold source data information;
c)、对所采集的放电阈值源数据信息和温度阈值源数据信息分别通过公式Y＝0.299R+0.587G+0.114B转换成灰度图像信息；c), the collected discharge threshold source data information and temperature threshold source data information are respectively converted into grayscale image information by the formula Y=0.299R+0.587G+0.114B;
公式中：Y为图像像素点的灰度值，R为红色像素分量值，G为绿色像素分量值，B为蓝色像素分量值；In the formula: Y is the grayscale value of the image pixel, R is the red pixel component value, G is the green pixel component value, B is the blue pixel component value;
Y范围为0～255，全白素点的灰度值为“255”，全黑像素点的灰度值为“0”；Y ranges from 0 to 255, the gray value of all white pixels is "255", and the gray value of all black pixels is "0";
放电阈值源数据信息转换成的灰度图像信息形成放电图像阈值数据信息，温度阈值源数据信息转换成的灰度图像信息形成温度图像阈值数据信息；The grayscale image information converted from the discharge threshold source data information forms discharge image threshold data information, and the grayscale image information converted from the temperature threshold source data information forms temperature image threshold data information;
b、干式电抗器环氧树脂绝缘介质开裂检测，包括以下步骤：b. Dry-type reactor epoxy resin insulation crack detection, including the following steps:
a)、图像信息取样，通过紫外成像仪和红外成像仪对待检测的环氧树脂绝缘介质分别进行多角度的拍摄，采集紫外图像数据信息和红外图像数据信息，并同时记录采集图像数据信息时的温湿度和光强度；a), image information sampling, through the ultraviolet imager and infrared imager to take multi-angle shots of the epoxy resin insulation medium to be detected, collect ultraviolet image data information and infrared image data information, and record the time when the image data information is collected temperature, humidity and light intensity;
b)、对所采集的紫外图像数据信息和红外图像数据信息分别通过公式Y＝0.299R+0.587G+0.114B转换成灰度图像数据信息；b), the collected ultraviolet image data information and infrared image data information are respectively converted into grayscale image data information by the formula Y=0.299R+0.587G+0.114B;
式中：Y为图像像素点的灰度值，R为红色像素分量值，G为绿色像素分量值，B为蓝色像素分量值；In the formula: Y is the gray value of the image pixel, R is the value of the red pixel component, G is the value of the green pixel component, and B is the value of the blue pixel component;
紫外图像数据信息转换成的灰度图像形成放电强度待检图像信息，红外图像数据信息转换成的灰度图像形成升温强度待检图像信息；The grayscale image converted from the ultraviolet image data information forms the image information of the discharge intensity to be checked, and the grayscale image converted from the infrared image data information forms the image information of the temperature rise intensity to be checked;
c)、对所采集的放电强度待检图像信息与图像阈值数据库中相同温湿度和光强度所对应的放电图像阈值数据信息进行对比，提取出放电强度待检图像信息中高于放电图像阈值数据信息部分在图像中所显示的轮廓，形成放电图像信息，如果放电强度待检图像信息未提取到放电图像信息，则判断结果为干式电抗器环氧树脂绝缘介质未异常放电；c) Comparing the collected image information of the discharge intensity to be checked with the discharge image threshold data information corresponding to the same temperature, humidity and light intensity in the image threshold database, extracting the part of the image information of the discharge intensity to be checked that is higher than the discharge image threshold data information The outline displayed in the image forms the discharge image information. If the discharge image information is not extracted from the image information of the discharge intensity to be checked, the judgment result is that the epoxy resin insulating medium of the dry-type reactor has not discharged abnormally;
d)、对所采集的升温强度待检图像信息与图像阈值数据库中相同温湿度和光强度所对应的温度图像阈值数据信息进行对比，提取出升温强度待检图像信息中高于温度图像阈值数据信息部分在图像中所显示的轮廓，形成高温图像信息，如果升温强度待检图像信息中未提取到高温图像信息，则判断结果为干式电抗器环氧树脂绝缘介质未异常升温；d) Comparing the collected temperature rise intensity to-be-checked image information with the temperature image threshold data information corresponding to the same temperature, humidity and light intensity in the image threshold database, extracting the part of the temperature rise intensity to-be-checked image information that is higher than the temperature image threshold data information The outline displayed in the image forms high-temperature image information. If the high-temperature image information is not extracted from the image information of the temperature rise intensity to be checked, the judgment result is that the epoxy resin insulating medium of the dry-type reactor has not abnormally heated;
e)、环氧树脂开裂检测判断，对放电图像信息和高温图像信息进行对比，其在图像中的轮廓重合部分即可判断为干式电抗器环氧树脂绝缘介质开裂位置，如果放电图像信息和高温图像信息未对比出轮廓重合部分即可判断为干式电抗器环氧树脂绝缘介质未开裂。e) Detection and judgment of epoxy resin cracking, comparing the discharge image information with the high temperature image information, the overlapping part of the contour in the image can be judged as the cracking position of the epoxy resin insulation medium of the dry-type reactor, if the discharge image information and It can be judged that the epoxy resin insulation medium of the dry-type reactor is not cracked if the high-temperature image information does not compare the overlapping parts of the contours.
本发明进一步改进在于：The present invention is further improved in that:
在步骤b中，通过紫外成像仪和红外成像仪对待检测的环氧树脂绝缘介质进行多角度的拍摄，为对待检测的环氧树脂绝缘介质进行周向多角度拍摄。In step b, the epoxy resin insulating medium to be inspected is photographed from multiple angles by the ultraviolet imager and the infrared imager, and the epoxy resin insulating medium to be inspected is photographed from multiple angles in the circumferential direction.
在步骤b中，对放电图像信息通过阈值分割算法进行消噪处理，对放电图像信息各像素赋予Y＝255或Y＝0，其数学模型为：In step b, the discharge image information is de-noised through the threshold segmentation algorithm, and Y=255 or Y=0 is assigned to each pixel of the discharge image information, and its mathematical model is:
公式中：Y为图像像素点的灰度值，t为阈值，g(x,y)为二值化后的灰度值，f(x,y)为二值化前的灰度值,选择220作为默认阈值。In the formula: Y is the gray value of the image pixel, t is the threshold, g(x, y) is the gray value after binarization, f(x, y) is the gray value before binarization, select 220 as the default threshold.
采用上述技术方案所产生的有益效果在于：The beneficial effects produced by adopting the above-mentioned technical scheme are:
1)本发明运用数字图像处理技术，对采集到的不同温度、湿度和光强度的环氧树脂绝缘介质紫外成像图和红外成像图有针对性的进行对比，更能真实准确的反应绝缘开裂情况，从而提高检测准确度。1) The present invention uses digital image processing technology to compare the ultraviolet imaging images and infrared imaging images of epoxy resin insulating media collected at different temperatures, humidity and light intensities in a targeted manner, so as to reflect the insulation cracking situation more truly and accurately. Thereby improving the detection accuracy.
2)本发明既能够定量表示放电程度，又能够通过获得红外图像进行定位，从而更准确判断干式电抗器的绝缘是否开裂以及绝缘开裂位置。2) The present invention can not only quantitatively indicate the degree of discharge, but also locate by obtaining infrared images, thereby more accurately judging whether the insulation of the dry-type reactor is cracked and the position of the insulation crack.
3)本发明可以对干式电抗器进行在线监测，反映出的干式电抗器绝缘开裂问题，可以减少甚至避免干式电抗器在运行期间产生击穿事故，将起到更好的防范作用。3) The present invention can carry out online monitoring on the dry-type reactor, and the reflected insulation cracking problem of the dry-type reactor can reduce or even avoid breakdown accidents of the dry-type reactor during operation, and will play a better preventive role.
4)本发明具有测试效率高，可靠性强，适合工程检测和科学研究，具有较高的应用价值。4) The present invention has high testing efficiency and strong reliability, is suitable for engineering testing and scientific research, and has high application value.
附图说明Description of drawings
图1是本发明建立图像阈值信息数据库的流程图；Fig. 1 is the flow chart that the present invention establishes image threshold value information database;
图2是本发明干式电抗器环氧树脂绝缘介质开裂检测的流程图。Fig. 2 is a flow chart of crack detection of epoxy resin insulation medium of dry-type reactor according to the present invention.
紫外检测原理Principle of UV detection
干式电抗器在制造过程中，绝缘介质可能含有微小的裂缝、孔隙等缺陷，或在运行中发生绝缘劣化，这些都可使绝缘表面场强增加，导致表面局部放电光强度剧烈增大，由放电机理可知，在放电的不同阶段，伴随着分子的激发、电离、复合、电荷交换、电子附着和辐射的不断发生，可以观察到不同光谱的发光现象，电晕放电光谱中含有部分紫外光谱段的发光，发出的紫外光就可以被紫外成像仪捕获。因此，检测放电发出的紫外线，可以判断放电强弱，从而确定电力设备绝缘介质的状态。采用高灵敏度的紫外传感器，能对设备的绝缘下降、裂伤、污秽发展等作出早期预报，保证设备的安全运行。紫外线的波长范围为10～400nm。太阳光中也含有紫外线，其中280nm以下光谱段的太阳辐射几乎完全被大气层吸收，因而被称为太阳盲区。该区间内由太阳发射的紫外光量极低。日光下的紫外放电检测即是利用太阳盲区光谱段实现对放电设备的检测。During the manufacturing process of dry-type reactors, the insulating medium may contain defects such as tiny cracks and pores, or insulation deterioration occurs during operation, which can increase the surface field strength of the insulation, resulting in a sharp increase in the intensity of partial discharge light on the surface. The discharge mechanism shows that at different stages of the discharge, along with the continuous occurrence of molecular excitation, ionization, recombination, charge exchange, electron attachment and radiation, luminescence with different spectra can be observed, and the corona discharge spectrum contains part of the ultraviolet spectrum. The emitted ultraviolet light can be captured by the ultraviolet imager. Therefore, by detecting the ultraviolet rays emitted by the discharge, the strength of the discharge can be judged, so as to determine the state of the insulating medium of the power equipment. The use of high-sensitivity ultraviolet sensors can make early forecasts for equipment insulation drop, laceration, and pollution development, so as to ensure the safe operation of equipment. The wavelength range of ultraviolet light is 10-400nm. Sunlight also contains ultraviolet rays, and the solar radiation below 280nm is almost completely absorbed by the atmosphere, so it is called the solar blind zone. The amount of ultraviolet light emitted by the sun in this interval is extremely low. Ultraviolet discharge detection under sunlight is the detection of discharge equipment by using the spectral segment of the solar blind zone.
红外检测原理Infrared detection principle
在干式电抗器环氧树脂绝缘介质发生绝缘劣化后，会造成运行中绝缘的分布电压改变、泄漏电流异常，出现发热或局部发凉迹象。利用红外检测技术，对绝缘介质进行红外热成像处理，可得到绝缘介质的热场分布，对应于绝缘介质的电压分布。由于劣化绝缘会造成裂纹处温升、内部穿透性泄漏电流和表面泄漏电流加大、发热增加等现象，表面温度较高，根据绝缘表面温度与相应位置正常绝缘子表面温度的对照，可判定环氧树脂绝缘介质绝缘状态。After the insulation deterioration of the epoxy resin insulation medium of the dry-type reactor, the distribution voltage of the insulation during operation will change, the leakage current will be abnormal, and there will be signs of heating or local cooling. Using infrared detection technology, the insulating medium is processed by infrared thermal imaging, and the thermal field distribution of the insulating medium can be obtained, which corresponds to the voltage distribution of the insulating medium. Since degraded insulation will cause temperature rise at cracks, internal penetration leakage current and surface leakage current increase, and heat generation increase, the surface temperature is relatively high. According to the comparison between the insulation surface temperature and the normal insulator surface temperature at the corresponding position, it can be determined that the ring Oxygen resin insulation medium insulation state.
红外检测就是通过探测物体的红外辐射信号，获得物体的热状态特征，并根据这种热状态特征及相应的判断依据判断出物体的状态。由于红外检测技术具有远距离、不接触、实时、快速等特点，因而对实现电力设备的在线监测和故障诊断具有重要的意义。电力设备主要采用红外成像和红外点温测量两种红外检测技术。Infrared detection is to obtain the thermal state characteristics of the object by detecting the infrared radiation signal of the object, and judge the state of the object according to the thermal state characteristics and the corresponding judgment basis. Because infrared detection technology has the characteristics of long-distance, non-contact, real-time and fast, it is of great significance to realize on-line monitoring and fault diagnosis of power equipment. Power equipment mainly adopts two infrared detection technologies: infrared imaging and infrared point temperature measurement.
具体实施方式Detailed ways
一种干式电抗器环氧树脂绝缘介质开裂检测方法，该方法为在线检测方法，其包括建立图像阈值信息数据库和干式电抗器环氧树脂绝缘介质开裂检测两大步骤：A dry-type reactor epoxy resin insulation medium crack detection method, the method is an online detection method, which includes the establishment of an image threshold information database and dry-type reactor epoxy resin insulation medium crack detection two steps:
a、建立图像阈值信息数据库，图像阈值信息数据库包括放电图像阈值数据信息和温度图像阈值数据信息，放电图像阈值数据信息和温度图像阈值数据信息的取得方法包括以下步骤：a. Establish an image threshold information database, the image threshold information database includes discharge image threshold data information and temperature image threshold data information, and the method for obtaining the discharge image threshold data information and temperature image threshold data information includes the following steps:
a)、通过紫外成像仪和红外成像仪分别在不同温湿度和光强度下对开裂的环氧树脂绝缘介质进行图像采集，得到不同温湿度和光强度下的紫外图像和红外图像；a) Collecting images of the cracked epoxy resin insulation medium under different temperature, humidity and light intensities by means of an ultraviolet imager and an infrared imager, respectively, to obtain ultraviolet images and infrared images under different temperature, humidity and light intensities;
b)、对所采集的紫外图像和红外图像中所对应的环氧树脂绝缘介质开裂部位像素进行提取，在紫外图像中所提取的像素为放电阈值源数据信息，在红外图像中所提取的像素为温度阈值源数据信息；b) Extract the pixels of the epoxy resin insulating medium cracking part corresponding to the collected ultraviolet image and infrared image. The pixel extracted in the ultraviolet image is the discharge threshold source data information, and the pixel extracted in the infrared image is the temperature threshold source data information;
c)、对所采集的放电阈值源数据信息和温度阈值源数据信息分别通过公式Y＝0.299R+0.587G+0.114B转换成灰度图像信息；c), the collected discharge threshold source data information and temperature threshold source data information are respectively converted into grayscale image information by the formula Y=0.299R+0.587G+0.114B;
公式中：Y为图像像素点的灰度值，R为红色像素分量值，G为绿色像素分量值，B为蓝色像素分量值；In the formula: Y is the grayscale value of the image pixel, R is the red pixel component value, G is the green pixel component value, B is the blue pixel component value;
Y范围为0～255，全白素点的灰度值为“255”，全黑像素点的灰度值为“0”；Y ranges from 0 to 255, the gray value of all white pixels is "255", and the gray value of all black pixels is "0";
放电阈值源数据信息转换成的灰度图像信息形成放电图像阈值数据信息，温度阈值源数据信息转换成的灰度图像信息形成温度图像阈值数据信息；The grayscale image information converted from the discharge threshold source data information forms discharge image threshold data information, and the grayscale image information converted from the temperature threshold source data information forms temperature image threshold data information;
b、干式电抗器环氧树脂绝缘介质开裂检测，包括以下步骤：b. Dry-type reactor epoxy resin insulation crack detection, including the following steps:
a)、图像信息取样，在温度23℃，湿度50％，光照强度4×104Lx检测环境下，通过紫外成像仪和红外成像仪对待检测的环氧树脂绝缘介质分别进行进行周向多角度的拍摄，采集紫外图像数据信息和红外图像数据信息；a) Sampling of image information. Under the detection environment of temperature 23°C, humidity 50%, and light intensity 4×10 4 Lx, the epoxy resin insulating medium to be detected is respectively inspected by the ultraviolet imager and the infrared imager at multiple angles in the circumferential direction. shooting, collecting ultraviolet image data information and infrared image data information;
b)、对所采集的紫外图像数据信息和红外图像数据信息分别通过公式Y＝0.299R+0.587G+0.114B转换成灰度图像数据信息；b), the collected ultraviolet image data information and infrared image data information are respectively converted into grayscale image data information by the formula Y=0.299R+0.587G+0.114B;
式中：Y为图像像素点的灰度值，R为红色像素分量值，G为绿色像素分量值，B为蓝色像素分量值；In the formula: Y is the gray value of the image pixel, R is the value of the red pixel component, G is the value of the green pixel component, and B is the value of the blue pixel component;
紫外图像数据信息转换成的灰度图像形成放电强度待检图像信息，红外图像数据信息转换成的灰度图像形成升温强度待检图像信息；对放电图像信息通过阈值分割算法进行消噪处理，对放电图像信息各像素赋予Y＝255或Y＝0，其数学模型为：The grayscale image converted from the ultraviolet image data information forms the image information of the discharge intensity to be inspected, and the grayscale image converted from the infrared image data information forms the image information of the temperature rise intensity to be inspected; the discharge image information is denoised through the threshold segmentation algorithm, and the Each pixel of the discharge image information is given Y=255 or Y=0, and its mathematical model is:
公式中：Y为图像像素点的灰度值，t为阈值，g(x,y)为二值化后的灰度值，f(x,y)为二值化前的灰度值,选择220作为默认阈值。鉴于紫外图像中的放电区域的图像较白，而背景图像的灰度值一般远低于该值，从大量的测试灰度化图像的直方图中发现在灰度值为220左右存在一个明显的波谷，因而选择220作为默认阈值；In the formula: Y is the gray value of the image pixel, t is the threshold, g(x, y) is the gray value after binarization, f(x, y) is the gray value before binarization, select 220 as the default threshold. In view of the fact that the image of the discharge area in the ultraviolet image is relatively white, and the gray value of the background image is generally much lower than this value, it is found from the histograms of a large number of test grayscaled images that there is an obvious gray value around 220. trough, so 220 is chosen as the default threshold;
c)、对所采集的放电强度待检图像信息与图像阈值数据库中相同温湿度和光强度所对应的放电图像阈值数据信息进行对比，提取出放电强度待检图像信息中高于放电图像阈值数据信息部分在图像中所显示的轮廓，形成放电图像信息，如果放电强度待检图像信息未提取到放电图像信息，则判断结果为干式电抗器环氧树脂绝缘介质未异常放电；c) Comparing the collected image information of the discharge intensity to be checked with the discharge image threshold data information corresponding to the same temperature, humidity and light intensity in the image threshold database, extracting the part of the image information of the discharge intensity to be checked that is higher than the discharge image threshold data information The outline displayed in the image forms the discharge image information. If the discharge image information is not extracted from the image information of the discharge intensity to be checked, the judgment result is that the epoxy resin insulating medium of the dry-type reactor has not discharged abnormally;
d)、对所采集的升温强度待检图像信息与图像阈值数据库中相同温湿度和光强度所对应的温度图像阈值数据信息进行对比，提取出升温强度待检图像信息中高于温度图像阈值数据信息部分在图像中所显示的轮廓，形成高温图像信息，如果升温强度待检图像信息中未提取到高温图像信息，则判断结果为干式电抗器环氧树脂绝缘介质未异常升温；d) Comparing the collected temperature rise intensity to-be-checked image information with the temperature image threshold data information corresponding to the same temperature, humidity and light intensity in the image threshold database, extracting the part of the temperature rise intensity to-be-checked image information that is higher than the temperature image threshold data information The outline displayed in the image forms high-temperature image information. If the high-temperature image information is not extracted from the image information of the temperature rise intensity to be checked, the judgment result is that the epoxy resin insulating medium of the dry-type reactor has not abnormally heated;
e)、环氧树脂开裂检测判断，对放电图像信息和高温图像信息进行对比，其在图像中的带状轮廓重合部分即可判断为干式电抗器环氧树脂绝缘介质开裂位置，如果放电图像信息和高温图像信息未对比出轮廓重合部分即可判断为干式电抗器环氧树脂绝缘介质未开裂。e) Epoxy resin cracking detection and judgment, compare the discharge image information with the high temperature image information, and the overlapping part of the strip outline in the image can be judged as the cracking position of the epoxy resin insulation medium of the dry-type reactor. If the discharge image It can be judged that the epoxy resin insulation medium of the dry-type reactor is not cracked if the overlapping part of the outline is not compared with the high-temperature image information.
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