CN103336224A - Complex information based insulator temperature rise fault comprehensive diagnosis method - Google Patents
Complex information based insulator temperature rise fault comprehensive diagnosis method Download PDFInfo
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- CN103336224A CN103336224A CN201310276226XA CN201310276226A CN103336224A CN 103336224 A CN103336224 A CN 103336224A CN 201310276226X A CN201310276226X A CN 201310276226XA CN 201310276226 A CN201310276226 A CN 201310276226A CN 103336224 A CN103336224 A CN 103336224A
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Abstract
The invention discloses a complex information based insulator temperature rise fault comprehensive diagnosis method, which includes the following steps: shooting an infrared image of an insulator through a thermal infrared imager, precisely extracting the area where the infrared image of the insulator locates through the image processing technology, combining the temperature information of the area, and then diagnosing the temperature rise fault of the insulator. The method has the advantages that the contamination degree of the insulator can be detected in the power-up state, and no equipment is needed to be mounted on a pole tower, so that the running and maintenance cost is low, the operation is simple, the use is safe and reliable, and the detection precision is high.
Description
Technical field
The present invention relates to the fault detection method of insulator, belong to power transmission and transforming equipment running status maintenance field, relate in particular to a kind of insulator temperature rise fault detection method based on composite information.
Background technology
In recent years, owing to greatly developing of UHV (ultra-high voltage), extra-high voltage alternating current-direct current transmission system, a large amount of insulators are applied in the middle of the electric system.The safe operation problem of insulator has directly influenced the safe reliability of whole transmission system.The existence of deterioration insulator will bring great threat to the safe reliability of Operation of Electric Systems.For adapting to the requirement of China's electric power development, utilize advanced technological means, systematically study the charged detection method of electric transmission line isolator deterioration, the monitoring of the safe operation that guarantees transmission line of electricity and line insulator state of insulation in service is had important engineering be worth, the research that advances and improve the insulator degradation detection is also had important academic significance.
Infrared thermal imaging technique is the measuring technique of a kind of noncontact, passive type, and it can detect and diagnose a large amount of inside of power equipment, External Defect, especially can also diagnose many conventional test methods to be not easy to the fault that maybe can't detect.All multiple faultss of insulator all show with temperature anomaly, and the ultimate principle of infrared detection and diagnosis is exactly the infrared radiation by detecting devices, obtains its temperature profile, and provide corresponding diagnostic measures according to its operation characteristic.Manufacturing process control is improper, inherent vice makes material becomes fragile, running environment changes influence etc., can cause the insulator deterioration.Behind insulator generation insulation degradation, can cause spread voltage change, the leakage current of insulator chain in service unusual, the heating sign appears.The thermal field that utilizes the infrared imaging detection technique can obtain insulator chain distributes, and can judge the running status of insulator according to the thermal imagery feature of insulator.
Utilize the thermal infrared imager thermometric, the characteristic on its temperature measurement accuracy and testee surface (as the true temperature on surface, slin emissivity, reflectivity etc.), the characteristic of background environment, factors such as atmospheric characteristic and thermal infrared imager detection system and signal handling property are relevant, realize that the infrared fault diagnosis of insulator must at first realize insulator and background segment.Because single method is difficult to satisfy all fault state, this paper intends image and the temperature information in conjunction with Infrared Thermogram, after obtaining clearly the insulator edge feature, in conjunction with temperature information, get rid of the influence in the background, realize the temperature rise fault diagnosis of insulator.
Summary of the invention
Technical matters to be solved by this invention is that a kind of insulator temperature rise synthetic fault diagnosis method based on composite information will be provided, and can be fast and effeciently the current operation conditions of insulator be made and analyzes accurately and reliably and judge.
In order to solve above technical matters, the present invention is in conjunction with image and the temperature information of Infrared Thermogram, after obtaining clearly the insulator edge feature, in conjunction with temperature information, gets rid of the influence in the background, realizes the temperature rise fault diagnosis of insulator.
The present invention has proposed a kind of insulator temperature rise synthetic fault diagnosis method based on composite information according to image and the temperature two aspect features of insulator, may further comprise the steps:
⑴ obtaining and pre-service of image;
A. obtain the infrared image of insulator to be detected;
B. adopt improved median filter method to carry out filtering and noise reduction;
⑵ edge extracting and the image of insulator are cut apart:
A. utilize improved Prewitt operator that the infrared image of insulator is carried out edge extracting;
B. utilizing its morphological feature that the insulator in the image is carried out image cuts apart;
C. the result of cutting apart according to edge extracting and image obtains the image that only comprises insulator;
⑶ image and temperature composite information comprehensive diagnos:
A. the insulator characteristics of image after image being cut apart is combined with the temperature information of infrared image, obtains the temperature information in insulator zone;
B. whether the design temperature threshold value exists the temperature rise fault to carry out comprehensive diagnos to insulator, realizes the purpose of fault diagnosis.
The information that the inventive method adopts comprises visible images, infrared image and temperature information.After utilizing improved median filter method to visible images and infrared image removal noise, at first the method that passing threshold is cut apart and mathematical morphology combines has detected the edge of insulator in the middle of visible images, eliminated the influence of all background informations except insulator, determine the accurate position of insulator in the infrared chart, obtain the location matrix at its place, edge.Utilize the temperature information of infrared image simultaneously, in conjunction with insulator marginal position matrix, insulator temperature overheating zone is accurately located, for its repair based on condition of component provides technical support.
Principle of the present invention is: when there is fault in insulator, dielectric loss when the shelf depreciation leakage current flows through megohmite insulant or ohmic loss can cause that all the insulator local temperature raises, so take the image of insulator thermal field image and visible light by thermal infrared imager, utilize image information and the temperature information of insulator simultaneously, realize the localization of fault of insulator.
Superior effect of the present invention is:
1) the insulator infrared image of taking is carried out denoising, improve picture quality and signal to noise ratio (S/N ratio);
2) cut apart according to the characteristics of image of insulator, utilize the morphology algorithm to obtain target insulator zone more accurately, make the temperature rise fault diagnosis result more accurate effectively;
3) can the temperature rise fault to insulator detect under the situation that does not have a power failure, does not take a sample, do not disintegrate, also not need at shaft tower any equipment to be installed, operation and maintenance cost are low, simple to operate, safe and reliable, the accuracy of detection height.
Description of drawings
Fig. 1 is process flow diagram of the present invention.
Embodiment
See also shown in the accompanying drawing, the present invention is further illustrated.
As shown in Figure 1, the present invention has proposed a kind of insulator temperature rise synthetic fault diagnosis method based on composite information according to image and the temperature two aspect features of insulator, and concrete steps are:
⑴ obtaining and pre-service of image;
A. utilize thermal infrared imager to obtain the infrared image of insulator to be detected in electric line or transformer station's real scene shooting, this infrared image comprises the information of two aspects, i.e. image information and the image concrete temperature information behind of the reflection insulator shape facility of showing with the colour temperature form;
B. adopt improved median filter method to carry out filtering and noise reduction, what original median filter method adopted is to get intermediate value again after gray-scale value is ranked into row from small to large, destroyed the realm information in structure and space, method after improving then directly is in line each column element by transposition, the realm information that has kept the complete relatively structure of former figure and space, adopt 3*3 to improve medium filtering and with respect to common medium filtering signal to noise ratio snr is brought up to 344.0807 from 343.3309, and the improvement medium filtering of 5*5 can be increased to 345.1077, has improved its filter effect.
⑵ edge extracting and the image of insulator are cut apart;
A. utilize improved Prewitt operator that the infrared image of insulator is carried out edge extracting.For overcoming classical Prewitt operator only detects the edge in 2 directions shortcoming, satisfy the requirement of image border multidirectional, constructed one 0 °, 45 °, 90 °, 135 ° of 4 direction template, image is carried out the neighborhood convolution, thereby can detect the edge of 4 directions.
B. utilizing its morphological feature that the insulator in the image is carried out image cuts apart.Utilize the big Tianjin of advantages of simplicity and high efficiency method (OSTU) that the image that contains insulator is carried out binaryzation among the present invention and cut apart, but the influence that still can be subjected to background after cutting apart.Therefore by this image being carried out 3 circular corrosion, the image that obtains has lost the edge feature of insulator, again it is carried out 5 sublinears and expands and 3 circular expanders, can accurately obtain comprising the position in insulator zone.
C. the result of cutting apart according to edge extracting and image, both combinations can obtain only to comprise the image of insulator accurately.
⑶ image and temperature composite information comprehensive diagnos:
A. the insulator characteristics of image after image being cut apart is combined with the temperature information of infrared image, obtains the temperature information in insulator zone;
B. design temperature threshold value T
F, consider the environment temperature T when taking
EAnd the influence of illumination, according to statistics, set T
F=30+T
E, when namely measurement point is than the high 30C of environment temperature °, utilize the temperature information of insulator edge inclusion region, whether exist the temperature rise fault to carry out comprehensive diagnos to insulator, realize the purpose of fault diagnosis.
Claims (1)
1. insulator temperature rise synthetic fault diagnosis method based on composite information is characterized in that: may further comprise the steps:
⑴ obtaining and pre-service of image;
A. obtain the infrared image of insulator to be detected;
B. adopt improved median filter method to carry out filtering and noise reduction;
⑵ edge extracting and the image of insulator are cut apart:
A. utilize improved Prewitt operator that the infrared image of insulator is carried out edge extracting;
B. utilizing its morphological feature that the insulator in the image is carried out image cuts apart;
C. the result of cutting apart according to edge extracting and image obtains the image that only comprises insulator;
⑶ image and temperature composite information comprehensive diagnos:
A. the insulator characteristics of image after image being cut apart is combined with the temperature information of infrared image, obtains the temperature information in insulator zone;
B. whether the design temperature threshold value exists the temperature rise fault to carry out comprehensive diagnos to insulator, realizes the purpose of fault diagnosis.
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| CN103529057A (en) * | 2013-10-21 | 2014-01-22 | 国网河南省电力公司驻马店供电公司 | Device and method for detecting pollution of insulator by image analysis combined with ultrasonic principle |
| CN104217425A (en) * | 2014-08-15 | 2014-12-17 | 国家电网公司 | Superpixel-based electric transmission and transformation equipment infrared fault image segmentation method |
| CN104713901A (en) * | 2015-01-23 | 2015-06-17 | 国家电网公司 | Infrared accurate temperature measurement-based composite insulator insulation defect detection method |
| CN106920240A (en) * | 2017-03-09 | 2017-07-04 | 国家电网公司 | A kind of insulator identification and method for diagnosing faults based on infrared image |
| CN106934418A (en) * | 2017-03-09 | 2017-07-07 | 国家电网公司 | A kind of insulator infrared diagnostics method based on convolution Recursive Networks |
| CN107340460A (en) * | 2017-05-11 | 2017-11-10 | 国家电网公司 | A kind of state-detection data characteristics parameter extraction and the method for standardization conversion |
| CN107483014A (en) * | 2017-06-16 | 2017-12-15 | 理光软件研究所（北京）有限公司 | A kind of photovoltaic panel failure automatic detection method |
| CN108537780A (en) * | 2018-03-27 | 2018-09-14 | 陕西科技大学 | A kind of insulator breakdown detection method based on the full convolutional neural networks of second order |
| CN109633306A (en) * | 2018-12-13 | 2019-04-16 | 国网湖南省电力有限公司 | The temperature rise calculation method of anti-ice-flashing composite insulator |
| CN109993736A (en) * | 2019-03-29 | 2019-07-09 | 浙江大学 | It is a kind of that different method is looked into based on the electrical equipment thermal imaging segmentation for improving weighting otsu algorithm |
| CN110672956A (en) * | 2019-10-14 | 2020-01-10 | 华北电力大学 | Composite insulator temperature rise judging method |
| CN110827270A (en) * | 2019-11-12 | 2020-02-21 | 南方电网科学研究院有限责任公司 | Composite insulator defect diagnosis method and system |
| CN110988663A (en) * | 2019-11-25 | 2020-04-10 | 广东电网有限责任公司 | Fault positioning method, device and equipment for gas insulated switchgear |
| CN111488868A (en) * | 2020-03-27 | 2020-08-04 | 贵州电网有限责任公司 | High-temperature area identification method and system based on transformer infrared image |
| CN112200784A (en) * | 2020-10-10 | 2021-01-08 | 福州润森电气自动化有限公司 | Intelligent defect diagnosis method for electrical equipment |
| CN113341276A (en) * | 2021-07-15 | 2021-09-03 | 厦门尚为科技股份有限公司 | Cable joint monitoring method |
| CN113763397A (en) * | 2021-09-03 | 2021-12-07 | 国网山东省电力公司电力科学研究院 | Composite insulator fault detection method and system |
| CN115015700A (en) * | 2022-05-07 | 2022-09-06 | 国网河北省电力有限公司建设公司 | Fault diagnosis method for insulator of power transmission line |
| CN115326880A (en) * | 2022-07-25 | 2022-11-11 | 广西电网有限责任公司北海供电局 | Composite insulator heating defect judgment method based on infrared image |
| WO2024082658A1 (en) * | 2022-10-17 | 2024-04-25 | 青岛海尔空调器有限总公司 | Method and system for temperature rise detection of air conditioner |
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Cited By (27)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103529057A (en) * | 2013-10-21 | 2014-01-22 | 国网河南省电力公司驻马店供电公司 | Device and method for detecting pollution of insulator by image analysis combined with ultrasonic principle |
| CN104217425A (en) * | 2014-08-15 | 2014-12-17 | 国家电网公司 | Superpixel-based electric transmission and transformation equipment infrared fault image segmentation method |
| CN104217425B (en) * | 2014-08-15 | 2017-02-01 | 国家电网公司 | Superpixel-based electric transmission and transformation equipment infrared fault image segmentation method |
| CN104713901A (en) * | 2015-01-23 | 2015-06-17 | 国家电网公司 | Infrared accurate temperature measurement-based composite insulator insulation defect detection method |
| CN106920240A (en) * | 2017-03-09 | 2017-07-04 | 国家电网公司 | A kind of insulator identification and method for diagnosing faults based on infrared image |
| CN106934418A (en) * | 2017-03-09 | 2017-07-07 | 国家电网公司 | A kind of insulator infrared diagnostics method based on convolution Recursive Networks |
| CN106934418B (en) * | 2017-03-09 | 2021-05-14 | 国家电网公司 | Insulator infrared diagnosis method based on convolution recursive network |
| CN107340460A (en) * | 2017-05-11 | 2017-11-10 | 国家电网公司 | A kind of state-detection data characteristics parameter extraction and the method for standardization conversion |
| CN107483014B (en) * | 2017-06-16 | 2019-03-29 | 理光软件研究所（北京）有限公司 | A kind of photovoltaic panel failure automatic detection method |
| CN107483014A (en) * | 2017-06-16 | 2017-12-15 | 理光软件研究所（北京）有限公司 | A kind of photovoltaic panel failure automatic detection method |
| CN108537780A (en) * | 2018-03-27 | 2018-09-14 | 陕西科技大学 | A kind of insulator breakdown detection method based on the full convolutional neural networks of second order |
| CN109633306A (en) * | 2018-12-13 | 2019-04-16 | 国网湖南省电力有限公司 | The temperature rise calculation method of anti-ice-flashing composite insulator |
| CN109993736A (en) * | 2019-03-29 | 2019-07-09 | 浙江大学 | It is a kind of that different method is looked into based on the electrical equipment thermal imaging segmentation for improving weighting otsu algorithm |
| CN110672956A (en) * | 2019-10-14 | 2020-01-10 | 华北电力大学 | Composite insulator temperature rise judging method |
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| CN110827270B (en) * | 2019-11-12 | 2022-10-28 | 南方电网科学研究院有限责任公司 | Composite insulator defect diagnosis method and system |
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| CN113763397B (en) * | 2021-09-03 | 2024-03-29 | 国网山东省电力公司电力科学研究院 | Composite insulator fault detection method and system |
| CN115015700A (en) * | 2022-05-07 | 2022-09-06 | 国网河北省电力有限公司建设公司 | Fault diagnosis method for insulator of power transmission line |
| CN115326880A (en) * | 2022-07-25 | 2022-11-11 | 广西电网有限责任公司北海供电局 | Composite insulator heating defect judgment method based on infrared image |
| WO2024082658A1 (en) * | 2022-10-17 | 2024-04-25 | 青岛海尔空调器有限总公司 | Method and system for temperature rise detection of air conditioner |
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Application publication date: 20131002 |