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Composite insulator has advantages in antifouling property, light weight, easy installation and transportation. It has been widely used in 1000kV UHV transmission lines. As the increase of operating voltage, the nonuniformity of potential and electric field distribution on the high voltage end of composite insulator is more serious due to its geometry configure, and the aging problem is easier to...
The Finite Element Method (FEM) is commonly used for electric field simulation. This paper presents, for the first time, the calculation of the electric field intensity on one phase of a 245-kV OIP condenser bushing by FEM considering the effect of metallic-contained colloids deposition on the outer surface of lower porcelain. The distribution of the electric field on the surface of the bushing is...
With the acceleration of urbanization and the rapid development of industry and agriculture, fog-haze occurs frequently in most parts of China, which is a serious threat to the safe operation of the power system. The effects of fog-haze on the insulators represent in two aspects: a) increasing contamination on the surface of insulators and b) increasing the leakage current and decreasing the flashover...
With the development of EHV and UHV transmission technology, more and more transmission lines are built across high altitude regions in China. The pollution flashover performances in high altitude regions are affected not only by the pollutants but also by the atmospheric parameters. To study the performance of insulators at high altitudes, six commonly used porcelain, glass and polymer insulators...
North American utilities are increasingly concerned with their ageing ceramic insulator assets as they are either fast approaching their expected end of life or have already exceeded them. Defects like broken, cracked and punctured discs are some of the most adverse problems that the utilities encounter. These defects give rise to the initiation of partial discharge (PD) activities within the samples...
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