Vacuum circuit breakers use vacuum as arc extinguishing medium and insulating medium. Each part is sealed by a shell made of insulating glass and other materials, and the sealing of the moving contact rod and the moving contact is realized by a metal bellows.
Vacuum circuit breakers have the following characteristics:
(1) The structure is light, the contact breaking distance is small (10kV, only 10mm), the action is fast, the operation is light, the size is small, and the weight is light.
(2) The arcing time is short, and since the contacts are in a vacuum state, arcing faults basically do not occur. Generally, we only need half a cycle (0.01 seconds) to automatically extinguish the arc, so there is a half cycle circuit breaker. That said, it has nothing to do with the amount of current passing through.
(3) The recovery speed of the contact gap medium is faster.
(4) Long service life.
(5) Less maintenance work, fireproof and explosion-proof.
The main development features of vacuum system circuit breakers are: short contact distance, small size, light weight, low action power, fast action, fire and explosion protection; short arcing time (usually we only need to pass half a cycle), and breaking current Not related to the problem; the working medium of the contact gap can be restored after the arc is extinguished. High speed and good breaking performance; slight burning of contacts when power off, long service life; low noise in the operating environment; suitable for frequent operations in enterprises, especially suitable for breaking capacitive load calculation current (10kV and below).
1. The high-voltage circuit breaker is suitable for high-voltage current in the circuit. Reducing high-voltage currents beyond the rated value is an important part of high-voltage circuits. In addition, a high voltage circuit breaker is a protective device that switches after a current failure or normal value. In addition, the capacity design of high-voltage circuit breakers is relatively large, mainly through the current transformer to increase the protection of the circuit breaker.
2. When the circuit structure has a short-circuit protection problem, the current will generate a strong magnetic field, which can offset the rebound force. Through the pulling of the release, the production mechanization technology is operated to realize the tripping of the system power control switch. But when the current exceeds the rated value, the current signal strength is large, and the development requires a lot of heat. Then, push the metal plate to increase the current value and shorten the operating activity time.
3. The high-voltage circuit breaker consists of five parts, of which the breaking part is the core component, which is mainly responsible for the wiring and breaking of the circuit breaker. After the circuit is actuated, the circuit is switched, then the command is transmitted to the switching element through the intermediate part, and the circuit is closed. The switch mainly has four parts, most of which are installed on the insulating bracket of the circuit breaker to insulate the current from the earth.
4. High-voltage circuit breakers are mostly used in power cost control information systems such as power plants and substations. Due to the developed arc extinguishing effect, the power grid system can be produced and operated normally, and the current of various electrical equipment can be interrupted by itself. In addition, when the current fails, the problematic current will be quickly cut off through the company's internal protection ecosystem to prevent safety risk incidents. It can be seen that whether the high-voltage circuit breaker can operate normally and economically has an important impact on the power electronic system of our country.