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What is the dry arcing distance of insulator?

Dry arcing distance is linear discharge distance, namely, the shortest distance along the surface of the insulator sheds or the sum of the shortest distance.

Arcing distance (also called flashover distance): the shortest distance in the air external to the insulator between the metallic parts which normally have the operating voltage between them. Refer to IEC61109.

composite insulator dead end type-Orient Power
composite insulator dead end type

Insulator is generally end up and down had screw teeth insert, then there is the umbrella group, dry arc distance is along the teeth to the umbrella group of top has been connected to another screw tooth distance.

The dry arcing distance of an insulator is fixed value, even to the insulators having the same voltage. The dry arcing distance of an insulator depends on the system voltage, Operational environment and so on. For example, we suppose that in those areas where the thunder happens frequently the dry-arc distance should be added up to 1050mm from original 1000mm in 110kV line.

The dry arcing distance of insulators is very important. When customers come from all over the world order insulators from insulator supplier, they should provide drawings or requirement details, including the dry arcing distance of insulator, and then insulator supplier will design and manufacture the insulator product for them.



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