Is the indoor high-voltage AC vacuum circuit breaker a load switch?

Xi an schneider baoguang intelligent technology co., ltd. answers for you: not the same concept. First of all, the breaking capacity of the circuit breaker is much greater than that of the load switch. The load switch is generally equipped with a simple arc extinguishing device, but its structure is relatively simple. The picture shows the pneumatic high-voltage load switch. Its working process is as follows: when the brake is opened, the spindle rotates clockwise under the action of the brake opening spring. On the one hand, the piston moves upward through the crank-slider mechanism to compress the gas; On the other hand, through the transmission system composed of two sets of four-bar mechanisms, the main knife is opened first, and then the arc-extinguishing knife is pushed to open the arc contact, and the compressed air in the cylinder blows out the arc through the nozzle.

Vacuum circuit breaker, "high-voltage vacuum circuit breaker", is named because its arc extinguishing medium and insulating medium of contact gap after arc extinguishing are both high vacuum; Vacuum circuit breaker has the advantages of small size, light weight, suitable for frequent operation and arc extinguishing without maintenance, and is widely used in distribution network. A brief history of development 1893, Rittenhouse, USA, proposed a vacuum interrupter with simple structure and obtained a patent for its design. 1920, Swedish Foga company made the vacuum switch for the first time. The research results published in 1926 also show the possibility of interrupting current in vacuum, but it can not be put into practical use because of its small interrupting ability and limited by the development level of vacuum technology and vacuum materials.

With the development of vacuum technology, the United States made the first batch of vacuum switches suitable for cutting off capacitor banks and other special requirements in the 1950s, and the breaking current was still at the level of 4 kA. Due to the progress of vacuum material smelting technology and the breakthrough of vacuum switch contact structure research, 196 1 year, vacuum circuit breakers with 15 kV and breaking current 12.5 kA were started to be produced. 15kV, 26kA, 3 1.5kA vacuum circuit breakers were successfully trial-produced in 1966, which enabled the vacuum circuit breakers to enter the power system with high voltage and large capacity. In the mid-1980s, the breaking capacity of vacuum circuit breakers has reached 100 kA. China started to develop vacuum switches from 1958. 1960, Xi jiaotong university and Xi' an switch rectifier factory developed the first batch of vacuum switches with 6.7 kV and 600 A breaking capacity. Then a three-phase vacuum switch with 65438±00kV and breaking capacity of 65438±0.5 kA was made. 1969 huaguang electron tube factory and Xi' an high-voltage electric apparatus research institute manufactured 10 kV and 2 kA single-phase fast vacuum switch. Since 1970s, China has been able to independently develop and produce vacuum switches of various specifications.