What is VS1 vacuum circuit breaker working principle?
The VS1-12 side-mounted vacuum circuit breaker adopts a fixed structure, which is mainly used in fixed switch cabinets. It can also be used alone to control and protect transmission and distribution lines.
Principle of permanent magnet operating mechanism
When the circuit breaker is in the closing or opening position, no current flows through the coil, and the permanent magnet uses the low magnetic impedance channel provided by the moving and static iron core to keep the iron core at the upper and lower limit positions without any mechanical locks. When there is an action signal, the current in the closing or opening coil generates a magnetic potential. The magnetic field generated by the coil and the magnetic field generated by the permanent magnet in the moving and static iron cores are superimposed and synthesized. The moving iron core and the drive rod fixed on it, Under the action of the synthetic magnetic field force, the switch body is driven to complete the opening and closing task at a specified speed within a specified time.
The reason why this mechanism is called a two-position bistable principle structure is that the moving iron core can be maintained at the two positions at the end of the stroke without consuming any energy. In the traditional electromagnetic mechanism, the moving iron core is held at one end of the stroke by the action of a spring, and at the other end of the stroke, it is protected by a mechanical lock or electromagnetic energy.
It can be seen from the above that the permanent magnet operating mechanism realizes all the functions of the traditional circuit breaker operating mechanism by combining the electromagnet and the permanent magnet: the permanent magnet replaces the traditional tripping mechanism to achieve the limit position retention function, The opening and closing coils provide the energy required for operation. It can be seen that due to the change in the working principle, the total number of parts of the entire mechanism has been greatly reduced, so that the overall reliability of the mechanism may be greatly improved.
Due to the characteristics of the permanent magnet mechanism itself, the reliability of the circuit breaker can be improved, and the closing and opening characteristics are only related to the coil parameters. Therefore, the opening and closing characteristics of the permanent magnet mechanism can be controlled by electronic or microcomputer systems to achieve speed characteristics. Intelligent control, with self-checking function. The control circuit can adopt electronic control, external junction gate DC contactor.
Principle of arc extinguishing chamber
VS1-12/M circuit breaker (with permanent magnet operating mechanism) uses a vacuum interrupter, which uses vacuum as the arc extinguishing and insulating medium. The interrupter has a very high degree of vacuum. When the moving and static contacts are in the operating mechanism When the electric switch is opened under the action, a vacuum arc will be generated between the contacts. At the same time, due to the special structure of the contacts, an appropriate longitudinal magnetic field will also be generated in the contact gap, which promotes the vacuum arc to maintain a diffusion type and make the arc uniform. Burns distributed on the surface of the contact.
Maintain a low arc voltage. When the current naturally crosses zero, the residual ions, electrons and metal vapors can be compounded or gathered on the contact surface and the shield in a microsecond order. The dielectric strength of the fracture of the arc extinguishing chamber It is quickly restored, so that the arc is extinguished to achieve the purpose of breaking. Because the vacuum circuit breaker uses a magnetic field to control the vacuum arc, it has a strong and stable breaking current capability.
