Basic structure of vacuum interrupter

The vacuum interrupter is mainly composed of airtight insulation system, conductive system, shielding system and contact system.

1. Outside insulation

Material: The materials of the insulating shell are glass, ceramics and glass-ceramic. Glass-ceramic is expensive, so it has not been practically used; glass has poor structural strength, and its usage has gradually decreased; ceramics have the best comprehensive performance and are therefore the most widely used.

Main function: The insulating shell mainly plays the role of insulating support and participates in forming an airtight insulating system.

What factors affect the life of the vacuum interrupter?

The life of the vacuum interrupter mainly depends on the life of the stainless steel bellows of the interrupter. Generally speaking, when the mechanical life of the arc-extinguishing chamber of the vacuum circuit breaker ends, the stainless steel bellows of the arc-extinguishing chamber is broken. At this time, the arc-extinguishing chamber (vacuum tube) is in an atmospheric state, and the movable contact can freely shake due to the loss of atmospheric pressure, and the shielding cover etc. may also change color due to the action of water vapor in the atmosphere. In addition to the quality of the arc extinguishing chamber (vacuum tube) of the vacuum circuit breaker, the mechanical life of the arc extinguishing chamber (vacuum tube) of the vacuum circuit breaker is determined by the quality of the arc extinguishing chamber (vacuum tube) itself. The existence of the following factors may lead to the reduction of the mechanical life.

Basic structure and use classification of vacuum switch tube

basic structure:

The outer shell of the vacuum switch tube is made of inorganic insulating materials such as glass, ceramics or glass-ceramic, in the shape of a cylinder, and the two ends are sealed with metal cover plates to form a sealed container.

There is a pair of contacts inside the shell, the static contact is fixed on the end of the static conductive rod, the moving contact is fixed on the end of the movable conductive rod, and the movable conductive rod extends out of the vacuum switch tube through the central hole of the bellows and the metal cover. outside. The movable conductive rod is welded with one port of the bellows in the middle.

Classification, material and service life of vacuum switch tubes

In the high-voltage power switch, the vacuum switch tube is a very core component, which can protect the circuit and reduce the occurrence of accidents and accidents. Today, the editor will introduce the knowledge of the classification, materials and service life of this component for everyone.