The composition of the conduction system of the vacuum interrupter

The fixed conductive rod, the fixed arc surface, the fixed contact, the movable contact, the movable arc surface and the movable conductive rod constitute the conduction system of the arc extinguishing chamber. Among them, the fixed conducting rod, the fixed arc surface and the fixed contact are collectively called the fixed electrode, and the moving contact, the moving arc surface and the moving conducting rod are collectively called the moving electrode, the vacuum circuit breaker assembled by the vacuum interrupter, and the vacuum load switch. When closing with the vacuum contactor, the operating mechanism closes the two contacts through the movement of the moving conductive rod, completing the connection of the circuit. In order to reduce the contact resistance between the two contacts as much as possible and keep it stable and to have good mechanical strength when the arc extinguishing chamber is subjected to dynamic and stable current, the vacuum switch is provided with a guide sleeve at one end of the moving conductive rod, and uses a set of compression springs. Maintain a rated pressure between the two contacts. When the vacuum switch breaks the current, the two contacts of the arc extinguishing chamber are separated and an arc is generated between them, and the arc is extinguished when the current naturally crosses zero, which completes the circuit breaking.