On-line detection method for AC power transmission line porcelain zero resistance insulator based on infrared thermal imaging
A technology for zero-value insulators and transmission lines, which is applied in the field of on-line detection of porcelain zero-value insulators for AC transmission lines, can solve the problems of no practical application, no judgment method, and high labor intensity, so as to reduce pollution flashover accidents and save Effects of manpower and workload reduction
Active Publication Date: 2009-07-22
湖南湖大华龙电气与信息技术有限公司
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[0003] At present, the detection of porcelain insulators mainly adopts the voltage distribution method, such as the short-circuiting fork or spark gap method commonly used in China, and the instruments for directly measuring the voltage distribution. Type measuring instrument, the workload is still h
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[0019] The equipment required for the implementation of the present invention is a high-precision infrared imager (requirement: temperature resolution≤0.06°C, lens focal length≥4m) and a porcelain insulator zero value analysis and judgment software (computer implementation program of the method of the present invention) installed computer. The steps of applying the present invention are:
[0020] (1) Infrared thermal image capture of in-service porcelain insulator strings on transmission lines, ultra-high voltage transmission lines can be photographed during power line inspections;
[0021] (2) The infrared thermal imaging data is input into the computer installed with the zero value analysis and judgment software of porcelain insulators;
[0022] (3) Run the porcelain insulator zero value analysis and judgment software to automatically analyze the infrared thermal image data and return the detection results.
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The invention relates to an on-line detection method for ceramic zero resistance insulators on an alternating current transmission line based on infrared thermal imaging, and belongs to the field of power transmission. The invention aims to provide an on-line detection method for ceramic zero resistance insulators with safety, economy, high efficiency and high accuracy. The invention adopts the technical proposal that when a ceramic insulator string has a zero resistance insulator, the spread voltage of other insulators is boosted, the reactance of the whole insulator string is reduced, the leakage current of the insulator string is increased, and the heating difference of the good insulators and the zero resistance insulators is increased. By shooting thermal field images of the insulator string through a high-precision infrared imaging instrument, adopting image processing technology to extract axial temperature distribution curves of the insulator string, and utilizing the difference of the axial temperature distribution curves of the adjacent insulators, the method achieves accurate judgment of the state of the insulators. The method can be used for zero resistance detection for the ceramic insulators on the alternating current transmission line in grade of 110KV and above voltage, and is applied to lightening workload of detection greatly and improving secure operation level of a power system.
Description
technical field [0001] The invention belongs to the field of electric power transmission, relates to on-line state detection of insulators, in particular to an on-line detection method for porcelain zero-value insulators of AC transmission lines based on infrared thermal imaging. Background technique [0002] The most commonly used power equipment in power systems is line insulators. Under the action of long-term mechanical force and electric field, porcelain insulators operating in transmission lines will lose their insulation performance and become zero-value insulators (resistance value less than 0.5MΩ). The appearance of zero-value insulators will increase the withstand voltage of other normal insulators, and flashovers are prone to occur under overvoltage and harsh weather conditions, directly affecting the safe operation of the power system, and seriously causing damage to the operation of the national economy and people's lives and property. huge loss. For this reaso...
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Inventor 姚建刚李佐胜毛李帆陈芳李文杰
Owner 湖南湖大华龙电气与信息技术有限公司
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