The characteristics of sf6 circuit breaker: 1. The fracture has high voltage resistance; its arc extinguishing ability and dielectric strength are both good. Under the same rated voltage level, the demand for the number of series fractures is higher than The number of air circuit breakers is more than half, and the utilization rate is relatively high. 2. The number of circuit breaks allowed is high and the maintenance cycle is long. 3. Good circuit breaking performance; it allows breaking of large currents and short arc extinguishing time. Regardless of whether it breaks large or small currents, its breaking performance is better than that of air circuit breakers or oil-less circuit breakers. 4. Large rated current. 5. Small footprint and strong anti-pollution ability.
The operating environment of this tutorial: Windows 7 system, Dell G3 computer.
SF6 circuit breaker is a circuit breaker that uses SF6 gas as the insulating medium. It belongs to the same air-blown circuit breaker as the air circuit breaker, but the difference is: ① The working air pressure is lower; ② During the arc blowing process, the gas is not discharged to the atmosphere, but is recycled in a closed system.
SF6 circuit breaker has the following characteristics:
(1) The fracture has high voltage resistance. Due to its strong arc extinguishing ability, high dielectric strength and high single-break voltage resistance, SF6 circuit breakers require fewer series breaks than air circuit breakers or oil-less circuit breakers at the same rated voltage level. For example, a general 220kv SF6 circuit breaker only needs 1~2 fractures, while air circuit breaker or oil-less circuit breaker requires 4 fractures.
(2) The number of circuit breaks allowed is high and the maintenance period is long. Since SF6 gas can be recovered after decomposition, the decomposition products under the action of electric arc do not contain carbon and other substances that affect the insulation ability, and the substances generated under strict control of moisture are not corrosive. Therefore, the insulation strength of the gas after circuit breakage If it does not drop, the maintenance cycle will be long.
(3) Good circuit breaking performance. SF6 circuit breaker allows large breaking current and short arc extinguishing time. Regardless of whether it breaks large or small current, its breaking performance is better than that of air circuit breaker or oil-less circuit breaker.
(4) Large rated current. Due to the high thermal conductivity of SF6 molecules, it has a good cooling effect on contacts and conductors, and there is no oxygen inside. There is no oxidation problem even at high temperatures, so the flow capacity is large.
(5) Small footprint and strong anti-pollution ability. The development of SF6 closed combined electrical appliances can greatly reduce the area occupied by substations, and SF6 circuit breakers are all used in fully closed system structures without exception, so they have strong anti-pollution capabilities.
What are the wiring methods of the circuit breaker?
1. Back-board wiring method
This wiring method has A big advantage is that if it is damaged later, it is very convenient to repair or replace. There is no need to rewire it, just disconnect the power supply of the previous stage. However, this installation method is more troublesome to operate. It has special mounting plates, screws, etc., and needs to be connected strictly according to the requirements.
2. Plug-in wiring
This wiring method is relatively simple, because a complete set of devices has been configured on the installation board. You only need to install it again. A special mounting base can be placed on the board, and the 6 plugs on the mounting base can be directly plugged into the sockets of the mounting plate. If it is damaged, just pull it out and replace it, because the wiring behind the board is relatively broken, so several more people are needed to operate it.
3. Drawer-type wiring
This wiring method is quite special, because the rocker is rotated forward or reverse to achieve entry and exit. Moreover, it is not fixedly installed. It has a drawer design for entry and exit, making operation and maintenance more convenient, and it is also safer and more reliable to use.
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