High-pressure vacuum switches can be divided into three types according to the purpose, use occasion and breaking capacity: vacuum circuit breaker, vacuum load switch and vacuum contactor.
Divided from the overall structure, the high-pressure vacuum switch includes 5 parts: the arc-extinguishing chamber, the breaking device, the insulating support, the transmission mechanism, the base and the operating mechanism, of which the core part of the high-pressure vacuum switch is two parts: the arc-extinguishing chamber And operating mechanism.
The insulation and arc extinguishing performance of the vacuum arc extinguishing chamber directly affect the performance of the high-pressure vacuum switch Roots screw vacuum unit. Generally speaking, the main components of the high-pressure vacuum interrupter are dynamic and static contacts, shielding cover, Boshan fire pump bellows and housing.
The contact material determines the performance, application scope and development direction of the high-pressure vacuum switch to a large extent, so ideally, the current breaking capacity of the contact material is large, the compressive strength is high, the anti-fusion welding performance is reliable, and the conductivity The thermal conductivity is high, the arc burn rate is low, and the cutoff value is low. However, judging from the current development of material technology, no contact material can meet these requirements at the same time.
Commonly used contact materials for vacuum switches include tungsten-based, molybdenum-based, copper-bismuth, and copper-chromium (CuCr). Conventional high-pressure vacuum switches generally use CuCr alloy contacts as the main body. In specific applications, the ratio of CuCr alloy in the contact material is often adjusted according to different needs. The ratio range is generally around CuCr25 ~ Cu-Cr50.
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