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What are the types of circuit breakers?

By:Nader Updated:August 17,2020 15:47PM

By voltage level: low-voltage circuit breakers, high voltage circuit breakers

By power nature: AC circuit breakers , DC circuit breakers.

By structure and arc extinguishing principle: air circuit breakers, oil circuit breakers, sulfur hexafluoride circuit breakers, vacuum circuit breakers, circuit breaker gas production.

What is the circuit breaker used for?

A circuit breaker is the circuit when a short circuit or overcurrent fault can be quickly cut off the power, to prevent failure to expand, but also can be used as a general switch, power distribution and control achieved.

What are the types of circuit breakers?

1. Classification of different arc extinguishing media

(1). Oil circuit breaker: refers to the breaking contacts of the transformer oil (oil circuit breaker), the use of transformer oil (oil circuit breaker) as the circuit breaker medium.

(2). Air blast circuit breaker: air pressure at the compressed air as the arc extinguishing medium and insulating medium breaker, arc used is generally in the range of (10 ~ 40atm) 1013 ~ 4052kPa of.

(3). SF6 circuit breaker: in SF6 gas as quenching medium, or circuit breaker serving as an insulating medium.

(4). A vacuum interrupter: refers to the breaking contacts in vacuum, a vacuum circuit breaker as the arc extinguishing medium and insulating medium, the degree of vacuum in the vacuum circuit breaker needs above 10-4 Pa. Another type of circuit breaker magnetic blow, the solid gas circuit breakers.

2. Classification of different installation locations

(1). Outdoor formula: refers to a wind, rain, snow, contamination, condensation, ice cream and other properties of concentrated, high-voltage switching device adapted to be mounted for use in the open air.

(2). Indoor formula: is having no wind, rain, snow, contamination, condensation, ice cream and other properties of concentrated, high-voltage switching equipment adapted to be mounted in the building.

3. Circuit breaker according to the overall structure and their way to different insulation classification

(1). Support insulator type (also known as insulators strut, strut). Structural features of this container-type circuit breaker is in the contacts and the arc extinguishing chamber (may be a metal tube or an insulating tube) at a high potential, which is supported by the insulator of the insulation, it can be used in series and several breaking elements a method of heightening the insulation composition breaker of a higher voltage level.

(2). A grounded metal box (also known as floor tank, tank). Characterized interrupter contacts and mounted on an empty ground metal case, the conductive loop is introduced into the bushing, to be borne by the SF6 gas insulation.

4. Power circuit breaker according to different classification systems operating position

(1). The generator breaker. It is mainly used to cut off the short-circuit fault generator bus. The generator circuit breaker there are three types: less oil type, compressed air type, and SF. type. The oil-less for smaller short-circuit current circuit breaker breaking capacity of the other two strong.

(2). Transmission breaker. Working breaker to 35kV and above power transmission system, such a request can be automatic breaker reclosing, and the need to stabilize the system should Cave open time and a short no current interval automatic reclosing (O ~ 2s). In addition breaker also requires transmission capacity of nearly zone malfunction and load long-term cut, if it is used as a contact breaker will also need to be considered out of step breaking capacity.

(3). Power distribution circuit breaker. 35kV power distribution system operates in the following, the rated voltage of 6 ~ lOkV, rated current of 200 ~ 1250A, rated breaking current, from the power supply to ensure reliability. Such automatic reclosing the circuit breaker are still required, because of its impact on stability of the system is small, the current interval time without automatic reclosing may be made larger (0 ~ 5s), the off time off requirements may be relaxed .

5. Interrupter according to the structural characteristics of SF6 circuit breakers free single pressure SF6 circuit breaker

(1). Apart from the fixed type. Set apart from the arc chamber are two stationary metal structure remains unchanged apart from the nozzle, the puffer chamber with motion of the movable contact bridge made of the insulating material, when the movable contact bridge metal exiting the nozzle, the high pressure gas chamber pressure outwardly through the arc gas exhaust nozzle.

(2). Variations from the open type. GA1621 variable pitch is in the interrupter chamber opening contact gaps, with the downward movement of the puffer chamber gradually lengthened, the insulating material nozzles are typically polytetrafluoroethylene,

6. According to different classification circuit breaker operating mechanism is operated by the energy of the energy in the form of

(1). A manual mechanism: refers to the closing mechanism by human power.

(2). DC electromagnetic means: refers to the mechanism by closing the DC electromagnet coils.

(3). Spring means: means manually or by means of the motor with a pre-stored energy of the closing spring.

(4). Liquid bandit mechanism: oil refers to the high pressure pushing the piston means to achieve the closing and opening.

(5). A hydraulic spring means: With a disc spring as an energy storage medium, transmission medium as hydraulic oil.

(6). Pneumatic means: means to urge the piston so that the compressed air circuit breaker, the closing mechanism.

(7). An electric actuator: motor control electronics to direct operation of the circuit breaker operating lever.