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Research of Image Processing Method on Alage Conolized on the Insulator Surface 35

Research of Image Processing Method on Alage Conolized on th...

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35th Electrical Insulation Conference (EIC)

作者： Ouyang, Xiaogang Jia, Zhidong Yang, Shifang Chen, Hao Wei, Cong Tsinghua Univ Grad Sch Shenzhen Shenzhen 518055 Peoples R China Guangzhou Bur CSG EHV Transmiss Co Guangzhou 510405 Guangdong Peoples R China

ISBN: (纸本)9781509039678

algae have recently been colonized on insulator surfaces, especially on surfaces of composite and RTV-coated insulators installed in warm and humid regions. The adverse effect produced by algae on hydrophobicity, flashover characteristics, and the material performance of insulators has been previously demonstrated in the laboratory. However, previous studies have not explored the research method for measuring the degree of growth to determine the severity of the effect of algae on insulators. A new kind of image processing method based on color segmentation is presented to discriminate the distribution of algae on the insulator surface. Two main procedures are included in this method. First, the unambiguous insulator images are obtained using a digital camera presupposed with a white balance. Second, the green algae pixels are recognized and extracted from the insulator images through a specific MATLAB program, which is determined to be capable of discriminating the algae distribution and calculating the algae coverage rate and characteristic green value. The insulators acquired from the 500-kV DC transmission lines have been considered for this study. Results show that the growth degree of algae was more serious on RTV-coated insulators than on composite insulators.

关键词： composite insulators RTV-coated insulators image processing method algae coverage rate

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Influence of algae Growth on the Electrical Performance of RTV Coated Post Insulators 28

Influence of Algae Growth on the Electrical Performance of R...

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28th International Symposium on Discharges and Electrical Insulation in Vacuum (ISDEIV)

作者： Ouyang, Xiaogang Jia, Zhidong Guan, Ruiyang Yang, Shifang Li, Yanglin Tsinghua Univ Grad Sch Shenzhen Shenzhen Peoples R China State Grid Jiangxi Elect Power Res Inst Nanchang Jiangxi Peoples R China

ISBN: (纸本)9781538643754

algae are found grow on the surface of room temperature vulcanized (RTV) silicone rubber coated insulators installed in warm and humid region such as Sichuan, which brings potential operating risk to power transmission and transformation equipment. In this research, two different types of 110kV RTV coated post insulators with algae growth were obtained from Sichuan. Firstly, the algae coverage rate of upper and lower surfaces of top, middle and bottom shed of insulators were calculated through the image processing method respectively. Then, the wet impulse puncture voltage and fog flashover voltage were tested on the algae-grow insulators as well as clean ones. Lastly, the equivalent salt deposit density (ESDD) and no soluble deposit density (NSDD) of insulators were measured. The results show that the algae on the lower surface of insulators are significantly less than the upper surface. algae have no effect on impulse puncture voltage of insulators. However, the algae decrease the flashover voltage of insulators under the condition of steam fog by 25.2%similar to 44.0% compared to the clean ones.

关键词： Post insulator algae coverage rate Impulse puncture Flashover

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