China 630A 6000A Eartch Leakch Leakh Leakh Vacuum Circuit VB5 Supplier (30 kV Pemutus Arus VB5)

2. Working principle of vacuum interrupter 
VB5 Vacuum Circuit Breakers use specially designed contacts to close and separate in a highly vacuum arc extinguishing chamber to achieve the purpose of closing and breaking the line current. Due to the high degree of vacuum with extremely high insulation strength, in the opening position, only a small contact distance can meet the insulation requirements. When the circuit breaker receives the closing signal under the action of the operating mechanism, the moving contact The head moves upward and contacts the static contact, completing the closing process. When the circuit of the ASHARE good quality circuit breaker is energized, when the opening signal is received, under the action of the operating mechanism, the moving contact moves downwards and leaves the static contact. The moving and static contacts separate instantly and an arc is generated. At the same time, the arc current flowing through the special structure of the contact produces a longitudinal magnetic field, which interacts with the arc, and the charged particles are rotated and diffused by the Lorentz force and move at high speed along the arc. Therefore, the burning damage to the contact surface by the arc is not concentrated in a small range, and the burning damage on the contact surface is lighter and uniform. When the arc current naturally crosses zero for the first time, it is extinguished. The residual ions, electrons and metal vapor can recombine or condense on the contact surface and the shield in a fraction of a millisecond. Therefore, the vacuum medium After the arc, the insulation strength recovers extremely quickly. Under a certain contact distance, the AC arc is extinguished to achieve the purpose of breaking the current.
Cross-section drawn of vacuum fire extinguishing chamber

3. Introduction of CRR1000 operating mechanism transmission

As shown in below chart: The box is used as a shell to install and support various parts of the operating mechanism. The energy storage system consists of an energy storage motor with a transmission (items 4, 28), a secondary chain drive (item 29), a triangle arm (item 3), a traction chain (item 2), a guide sprocket (item 37), The closing spring (item 1), limit switch S1 (item 21), drive arm (item 26), energy storage shaft and clutch arm (item 20) are composed.

The cam transmission system consists of a cam (item 9), a transmission plate (item 11), a roller (item 10), an ejector rod (item 13), a main shaft (item 14), a contact pressure spring (item 18), and a main arm (item 18) Item 15), opening spring (item 17), and oil buffer (item 23). The closing and opening holding and releasing devices are each composed of a secondary holding crank arm (item 6, item 27, item 30, and item 31), a small crank arm (item 12) and a closing and opening operating handle.

The secondary control system consists of auxiliary switch QF (item 19), limit switch S1 (item 21), closing and opening coils HQ, TQ (item 8, item 22).

 

Schematic diagram of mechanical transmission