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Inspection and Monitoring Technologies of Transmission Lines with Remote Sensing by Kai Liu, Yi Hu

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1. Reasons for insulator strings’ ice flashover fault.

a. When air is very heavily polluted, it can generate an ice flashover trip easily. The insulation resistance of pure ice is high, but a lot of electrolytes in the icing increase the electrical resistivity of the glacial water. On a glaze day, atmospheric pollution can be deposited in the insulator surface with freezing rain to form icing, gradually increase in weight, and form an ice bridge between insulator sheds. Once the weather becomes warm, the ice bridge surface has high conductivity (the practically measured icing conductivity on site can reach 300 μs/cm at most, which is higher than that of the cleaning ice obviously), melting ice sheets. At the same time, melting ice flowing ...

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