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| Novel Method for Electric Field Calculation Considering the Thickness of Contaminant Layer on the Surface of Composite Insulator |
| Wang Feng1,2, Liao Pingjun1, Huang Jun3, Luo Yong3, Xiao Yunjun3 |
1. School of Electrical and Information Engineering Hunan University Changsha 410082 China;
2. State Key Laboratory of Electrical Insulation and Power Equipment Xi’an Jiaotong University Xi’an 710049 China;
3. State Grid Zhuzhou Power Supply Company Zhuzhou 412000 China |
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Abstract To study the mechanism of composite insulator pollution flashover, electric field analysis of the polluted composite insulators is required. However, the thickness of the contamination layer is only a fraction of millimeter that is much smaller than the size of insulator itself. Consequently, neither the finite element method nor boundary element method can solve such field problems with multiple scales at present. Therefore, This paper proposes a new method to calculate the surface electric field of polluted insulator based on the digital image processing. First, binary image processing is applied to the image of insulator with size m×n, and regional meshing is realized at each the pixel unit. Meanwhile, a mathematical model of impedance is established based on pixel unit. Then the node admittance matrix of size (m×n)×(m×n) is formed. The distribution of surface electric field of polluted insulator is calculated by electrical network analysis using node voltage method. The example shows that, compared with the existing algorithms, this method has significant advantages and improved effectiveness for modeling filthy layer which revealed contamination mechanism of composite insulator surface flashover, corona discharge, etc.
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Received: 01 April 2014
Published: 11 July 2016
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2016, Vol. 31 
