High voltage insulator outer insulation at the high voltage insulator terms and exposed to atmospheric pressure and air gap insulation insulation on the surface of the insulator.
Withstand voltage value of the external insulation is closely related to the atmospheric conditions.
Air gap breakdown and creepage flashover is the expression of loss of external insulation insulation performance, in general, breakdown or flashover occurred after air insulation can automatically recover, belong to self healing insulation.
High voltage insulator insulation refers to is not direct contact with the atmosphere in the insulation, the withstand voltage value has nothing to do with the atmospheric conditions.
Internal insulation can be made of solid, liquid, gas, or the combination of a variety of media, inner insulation breakdown is often cannot be automatically restored, once belong to the self healing insulation.
Self healing after breakdown under the action of applied voltage, insulation insulation, insulation performance can be automatically return to the previous level, such insulation according to self healing insulation.
Generally outside insulation belong to self healing, but there are exceptions.
The self healing under the action of applied voltage, insulation insulation breakdown, insulation performance loss or cannot fully recover to previous levels of insulation, such insulation according to the self healing insulation.
In general internal insulation belong to self healing insulation, but there are exceptions.
Destructive discharge breakdown in solid medium, usually * * of dielectric insulation damage.
Flashover in under the action of applied voltage, take place between different potentials of two electrodes, along the solid medium and discharge phenomenon arising out of the air interface.
On the flashover channel ionization in the strong enough to generate arc.
High voltage insulator basic lightning shock insulation level under certain conditions the recovery since the insulation standard lightning surge, with 90% tolerance probability (
A 10% probability of discharge)
The standard of ray wave amplitude.
Basic operation shock insulation level under certain conditions the recovery since the insulation standard operating shock wave, with 90% tolerance probability (
A 10% probability of discharge)
The standard operating wave amplitude.
Dry arc distance between the two end electrode through intermediate medium * put some short distance, or * short by a number of intermediate electrode discharge distance.
Connection length of electrical conductor and the linear distance between support structure, including the length of the insulation on both ends of the distance and connection hardware.
Reveal the distance in between two conductive parts along the sum of * distance measured on the surface of the insulation.
Be protect leak from direct sunlight, wind, rain and other natural factors on the surface of the insulation of the leakage distance.
For porcelain insulator and glass insulator suspension type, be protected under the leakage distance refers to the insulator surface along the edge of slot leakage distance.
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