Part of the main screen shield and bellows shield, generally use oxygen-free copper or stainless steelmain effect:1) to prevent the contact in the arcing process to produce a large number of metal vapor and droplet splashing, pollution of the inner wall of the insulating shell, to avoid causing the Vacuum interrupter for vacuum circuit breaker shell insulation strength decreased or flashover. Bellows shield is mainly to protect the bellows from the corrosion of metal vapor and lead to leakage, and now some of the design is more bold, abolished the bellows shield to reduce costs, reduce the size
2) Improve the electric field distribution inside the vacuum interrupter3) absorbs part of the arc energy, condensing the vacuum interrupter. In particular, the vacuum interrupter in the breaking short-circuit current, the arc generated by the heat most of the shielding system is absorbed, help to improve the strength of the media between the contact recovery. The greater the amount of absorption of the arc generator, the greater the energy he absorbs, which is good for increasing the breaking capacity of the vacuum interrupter.You said that the epoxy resin is usually through the APG process, the arc chamber to seal the required materials, the direction is completely different
(1) the arc chamber pressure is an important basis for the formation of air blowing, but too high pressure will cause the arc chamber shell strength is too high.
(2) the pressure of the arc chamber is an important basis for the formation of air blowing, but too high pressure will cause excessive pressure on the arc chamber shell requirements.
(3) vacuum interrupter optimization design of an important goal is to improve the breaking performance at the same time, as much as possible to reduce the pressure inside the arc chamber.
(4) the use of gas-generating materials to improve the pressure of the arc chamber to promote air blowing, while the use of gas generated by cooling the Vacuum interrupter for vacuum circuit breaker , can significantly improve the disconnection of the arc chamber performance. Choosing the right gas-producing material is important for optimizing the design of the interrupter.
(P) (POM), nylon, PBT (polycarbonate) three kinds of gas production materials, experiments show that nylon is more suitable for gas production materials.
