Circuit breaker supplier tell you about the types of circuit breakers

Circuit breakers are divided into voltage levels: low-voltage circuit breakers, high-voltage circuit breakers;
According to the nature of power supply: AC circuit breaker, DC circuit breaker.
From the structure and arc extinguishing principle, it can be divided into: air circuit breaker, oil circuit breaker, sulfur hexafluoride circuit breaker, vacuum circuit breaker, gas-producing circuit breaker.
Circuit breaker supplier tells you that the function of the circuit breaker is to quickly cut off the power supply when a short circuit or overcurrent fault occurs in the circuit to prevent the fault from expanding. At the same time, it can also be used as a general switch to realize the distribution and control of electric energy.

1. According to the different classification of installation locations
(1) Outdoor type: refers to the high-voltage switchgear that has the properties of wind, rain, snow, dirt, condensation, ice and thick frost, and is suitable for installation in the open air.
(2) Indoor type: refers to the high-voltage switchgear that does not have the properties of wind, rain, snow, contamination, condensation, ice and thick frost, and is suitable for installation in buildings.

2. According to the different classification of arc extinguishing medium
(1) Oil circuit breaker: Refers to a circuit breaker whose contacts are broken in transformer oil (circuit breaker oil) and uses transformer oil (circuit breaker oil) as an arc extinguishing medium.
(2) Compressed air circuit breaker: a circuit breaker that uses compressed air as the arc extinguishing medium and insulating medium, and the air pressure used for the arc is generally in the range of 1013 ~ 4052kPa (10 ~ 40atm).
(3) SF6 circuit breaker: a circuit breaker that uses SF6 gas as an arc extinguishing medium, or doubles as an insulating medium.
(4) Vacuum circuit breaker: Circuit breaker supplier tell you that the circuit breaker using vacuum as the insulating medium and arc extinguishing medium, the finger contacts are broken in vacuum, and the vacuum degree required by the vacuum circuit breaker is above 10-4 Pa.
In addition, there are magnetic blowing circuit breakers, solid gas production circuit breakers and other types.

3. According to the overall structure of the circuit breaker and its different types of insulation to the ground
(1) Insulator support type (also known as insulator post type, post type). The structural feature of this type of circuit breaker is that the container (which can be a metal cylinder or an insulating cylinder) that houses the contacts and the arc extinguishing chamber is at a high potential, and is insulated from the ground by the supporting insulator. It can be connected in series with several breaking elements and The method of increasing the insulation to ground constitutes a circuit breaker with a higher voltage level.
(2) Grounded metal box type (also known as floor tank type, tank type). Its characteristics are that the contacts and arc extinguishing are installed in a grounded metal box, the conductive circuit is introduced by an insulating sleeve, and the ground insulation is borne by SF6 gas.

4. According to the different classification of circuit breakers in the power system

(1) Generator circuit breaker. It is mainly used to cut off the short-circuit fault of the generator bus. Circuit breaker suppliers tell you that there are 3 types of generator circuit breakers: less oil, compressed air, and SF. type. The oil-less type is used for circuits with small short-circuit current, and the other two circuit breakers have strong breaking capacity.

(2) Transmission circuit breaker. Circuit breakers working in power transmission systems of 35kV and above, such circuit breakers are required to be able to perform automatic reclosing, and due to the need for system stability, they should have short breaking time and no current interval time for automatic reclosing (O ~2s). In addition, the transmission circuit breaker is also required to have the ability to cut off near-zone faults and no-load long lines. If it is used as a tie breaker, the out-of-step breaking capacity needs to be considered.

(3) Distribution circuit breaker. Working in the power distribution system below 35kV, the rated voltage is 6~10kV, the rated current is 200~1250A, and the rated breaking current is small, so as to ensure the reliability of the power supply. This type of circuit breaker still has the requirement of automatic reclosing, and because it has little influence on the stability of the system, the no-current interval time of automatic reclosing can be made larger (0 ~ 5s), and the requirements for breaking time can also be appropriately relaxed. .

5. According to the different classification of the operating mechanism of the operating energy used by the circuit breaker
(1) Manual mechanism: refers to the mechanism that closes the switch manually.
(2) DC electromagnetic mechanism: refers to the mechanism that relies on the DC solenoid electromagnet to close.
(3) Spring mechanism: refers to a mechanism that uses a spring that is previously stored by manpower or motor to close.
(4) Liquid bandit mechanism: refers to the mechanism that pushes the piston with high pressure oil to realize closing and opening.
(5) Hydraulic spring mechanism: refers to the use of disc spring as the energy storage medium and hydraulic oil as the transmission medium.
(6) Pneumatic mechanism: refers to the mechanism that pushes the piston with compressed air to open and close the circuit breaker.
(7) Electric operating mechanism: use a motor controlled by an electronic device to directly operate the circuit breaker operating lever.

6. Single-voltage SF6 circuit breakers are classified according to the structural characteristics of the arc-extinguishing chamber of SF6 high-voltage circuit breakers
(1) Fixed distance type. The structure of the fixed distance arc extinguishing chamber is that two fixed metal nozzles maintain a constant distance, and the moving contact bridge moves together with the pressure chamber made of insulating material. When the metal of the moving contact bridge leaves the nozzle, the high pressure in the pressure chamber The gas is discharged out through the arc and nozzle.
(2) Variable distance type. GA1621 variable opening distance is the contact opening distance in the arc extinguishing chamber, which gradually lengthens with the downward movement of the compressed air chamber. The insulating nozzle is usually made of PTFE material.

Summary of circuit breaker suppliers: The circuit breaker can be purchased according to the voltage level, power supply nature, structure and arc extinguishing principle, installation location, arc extinguishing medium, etc. For more featured articles, visit the Circuit Breaker News section.