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1) electrical properties: along the insulation surface happen destructive discharge called flashover, flashover characteristic is insulator main electrical properties. For different voltage level, insulator of withstand voltage requirements each are not identical, the indicators are working frequency dry, wet pressure, lightning shock pressure, lightning impact cutting wave pressure, operating impact pressure, etc. To avoid in the operation of the breakdown, insulator flashover voltage higher than the flashover voltage.

In the factory test, can breakdown type of porcelain insulator general after spark test, namely plus high insulating surface occurs frequently sparks, and maintain a certain time, look to whether be breakdown. Some insulator still need after corona test, radio interference test, partial discharge test and dielectric loss test, etc. High altitude area insulator, for empty

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