Circuit breaker arc extinguish method introduced:
Circuit breaker arc is an important application of the arc, not only on the equipment line to cause damage, and even affect the safety of. Thus the arc extinguishing what is necessary, in general the interrupter of commonly used four methods, including mechanical interrupter, magnetic blowing arc. In this paper, I explain the arc of the common methods and some common circuit breaker arc quenching principle.
First discuss now commonly used interrupter method, mainly has the following four kinds:
1, mechanical interrupter: through the limiting device electric arc can be rapidly elongated. This method is used for switching appliances.
Magnetic blow-out: in 2, a contact series magnetic blow coil generates magnetic field, arc by electromagnetic forces and elongated, blown with solid medium to form the arc extinction hood, and solid medium contact arc is extinguished, cooling and.
3, narrow ( longitudinal ) arc method: in the arc formed by the magnetic force, the arc elongated and into the arc shield narrow ( longitudinal ) seam, several longitudinal seam can be divided into several segments and arc contact with solid medium, the arc is extinguished rapidly. This structure is used for AC contactor.
4, gate plate arc quenching method: when the contact is separated, the arc produced in the electric force is pushed into a group of metal gate and is divided into several segments, mutually insulated metal gates of each piece are equivalent to one electrode, so there are dozens of cathode and anode drop. Of AC arc, near the cathode arc at zero, there will be a 150V ~ 250V dielectric strength, so that the electric arc can not continue to maintain and extinguished. Because the gate sheet arc-extinguishing effect than DC is much stronger, so often used AC electrical grid plate arc quenching.
These methods are mainly targeted at low voltage circuit breaker by using these methods, to understand the reason, must make clear a breaker arc extinguish principle, below some commonly used circuit breaker is discussed.
High-voltage drop fuse breaker arc quenching principle
We all know that in the high voltage and large current situation, switch to the arc often use the complex method and structure, and the high-pressure drop fuse only need a very simple hose can be smoothly and achieve a good arc, the main reasons are: first, high-pressure drop fuse current is not great. The arc is not great. Second, it is with air arc quenching. There is little and open arc extinguishing principle. Just different structures.
Vacuum circuit breaker arc quenching principle
In vacuum circuit breaker breaking moment, due to the two contact capacitance exists, make contact insulation breakdown, resulting in a vacuum arc. Since the contact shape and structure, so that the vacuum arc column quickly to the arc column in vacuum diffusion region. When the current is cut off close to zero, contact arc temperature and pressure drops quickly, so that the arc cannot continue burning. The arc is extinguished after the s, two contacts of the vacuum gap voltage levels rapidly returned. At the same time, contact has reached a certain distance, can withstand the high recovery voltage. Therefore, the general current at zero, no arc reignition by breaking. This is the principle of the arc.
The above description by the country electric switch factory for you, www.jiandq.com