The role of vacuum interrupter shielding system

The shielding system of the vacuum interrupter is mainly composed of shielding cylinder, shielding cover and other parts.

The main functions of the shielding system are:
1. Prevent the contacts from producing a large amount of metal vapor and droplet splashing during the arcing process, polluting the inner wall of the insulating housing, and avoiding the reduction of the insulating strength of the vacuum interrupter housing or flashover.
2. Improve the electric field distribution inside the vacuum interrupter, which is beneficial to the miniaturization of the vacuum interrupter insulation shell, especially for the miniaturization of the high-voltage vacuum interrupter.
3. Absorb part of the arc energy and condense arc products. Especially when the vacuum interrupter is breaking short-circuit current, most of the heat energy generated by the arc is absorbed by the shielding system, which is beneficial to improve the recovery strength of the medium between the contacts. The greater the amount of arc products absorbed by the shielding system, the greater the energy absorbed by the shielding system, which has a good effect on increasing the breaking capacity of the vacuum interrupter.