Composite insulator for high voltage line

For lines in operation, in order to prevent pollution flashover of insulators, the following measures can be taken:  

1) Clean the insulators regularly, or take the method of live flushing;   

2) The surface of the insulator is coated with a layer of hydrophobic dustproof paint. Commonly used are silicone grease, ozokerite paint, etc. In this way, it is not easy to form a continuous water film on the surface of the insulator, thereby reducing the leakage current and preventing the flashover voltage from decreasing;   

3) Reinforce insulation or use anti-fouling insulators. The easiest way to strengthen the insulation is to increase the length of the insulator to increase the creepage distance; it is also possible to use anti-fouling insulators with a creepage distance much larger than that of general insulators; The electrical performance faults of insulators include flashover and breakdown. Flashover occurs on the surface of the insulator, where burn marks are visible, and usually does not lose the insulation performance; breakdown occurs inside the insulator, and discharges through the porcelain body between the iron cap and the iron foot. There may be no traces on the surface, but the insulation performance has been lost. The insulator may be completely destroyed due to arc generation. For breakdown, attention should be paid to checking the discharge traces and burns of the iron feet in order to modify the insulator design for different situations.

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