Arc-Free Power Circuit Breakers

Abstract

The invention provides a novel arc-free power circuit breaker. The novel arc-free power circuit breaker is characterized by comprising a single-phase or three-phase mechanical switch K, a single-phase or three-phase power electronic reversible switch D corresponding to K, a controller P, and detection instruments V1 and V2, wherein K and D form a double-switch channel controlled by P; the double-switch channel is connected between high-voltage input (IR) and output (OUT); a main contact of K is connected with D in parallel; a control electrode r of D is connected to the intelligent controller P; when the circuit breaker trips, K contacts are firstly switched off while D is subsequently switched off; when the circuit breaker is switched on, D is firstly switched on while K contacts are subsequently switched on. Both the voltage of the inlet ends and the voltage of the outlet ends of the K contacts approach to zero due to the switching-on of the D at the moment of switching on or off by using the arc-free switching on and off characteristic of the power electronic switch, therefore, the arc is not generated. The novel arc-free power circuit breaker can be used for replacing the conventional high-voltage power circuit breaker with complex structure.

Description

technical field [0001] The invention mainly relates to high-power circuit breakers in the field of electric power, in particular to medium and high-voltage power circuit breakers with voltage levels of 3, 6, 10KV and above. Background technique [0002] Historically, all kinds of high-power circuit breakers installed in the power supply and distribution equipment of the power system, especially the medium and high-voltage circuit breakers, can be connected or disconnected according to people's will. The key to breaking short-circuit fault circuits lies in the arc-extinguishing function of the circuit breaker's arc-extinguishing system. [0003] As we all know, when operating a non-no-load circuit, the current-carrying main contact of the circuit breaker forms a strong electric field due to the high voltage between the operating contacts immediately before it is turned on or after it is turned off, causing the medium or air ionization breakdown , so no arc is generated. The...

AI Technical Summary

Problems solved by technology

Non-contact switch products have been developed and improved in full swing in the 1990s. People in the industry believe that all kinds of high-power circuit breakers will enter the "non-contact" era. However, it has been found in practice that high-power power electronic modules are long Carrying the load current for a long time produces large power consumption, and its unavoidable thermal hidden dangers bring greater risks and hidden dangers to system safety, so it cannot replace mechanical switches, let alone medium and high voltage power circuit breakers

[0009] For more than 100 years since the birth of power circuit breakers, experts in product research and development have always focused on the subject of arc extinction and struggled to solve key problems; and since the birth of power electronics technology for decades, experts in product research and development have always focused on high efficiency, high speed and low heat. , no one cared about the change of the basic structure and basic mode of the circuit breaker, and no one introduced a high-power circuit breaker solution that can avoid the switch arc and avoid the risk of online heat loss

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