Active arc extinguishing method, device and circuit breaker, automatic transfer switch

Abstract

The invention discloses an active arc extinguishing method, which is used for arc extinguishing of a mechanical switch; a second power supply branch connected in parallel with the first power supply branch is provided for the load outside the first power supply branch composed of a power supply and a mechanical switch. power supply branch, and control the second power supply branch during the opening process of the mechanical switch: first, so that the current I in the first power supply branch at time t n =I n_ref In order to control the target, control the second power supply branch to inject current into the first power supply branch, t is the physical opening time or a certain time after that, the target current I n_ref The direction of the voltage of the power supply at time t is opposite to that of the power supply; then, the output voltage of the second power supply branch is controlled with the voltage phase at both ends of the load tracking the voltage phase at both ends of the load under the condition of power supply as the control target, and the output voltage of the second power supply branch is controlled for at least the duration time for one cycle of the power supply. The invention also discloses an active arc extinguishing device, a circuit breaker and an automatic transfer switch. The invention can realize the effect of rapid arc extinguishing.

Description

Technical field [0001] The present invention relates to an arc extinguishing method, and more particularly to an active arc extinguishing method. Background technique [0002] When the circuit breaker is turned off in the air, as long as the voltage exceeds 12V to 20V, the opening current exceeds 0.25a to 1a, typically generates a very temperature in the contact gap, a strong light, and can conduct a conductive switch arc. . The presence of the arc makes the mechanical contacts even if the circuit remains on, but not only the opening time is extended, but the high temperature of the arc will cause the contact to burn, which will destroy insulation, and even cause the explosion of the switch and even cause the explosion of the switch. . [0003] Automatic Transfer Switch (ATS) is also a fuel in the conversion process. If the arc is not turned off in time, it may cause a short circuit of the two power supply. In order to improve reliability, ATS except for the design of conventiona...

AI Technical Summary

Problems solved by technology

However, solid-state switches need to cooperate with resonant circuits and absorbing circuits to work effectively, and the circuit design is relatively complicated

In addition, for the dual power conversion system using ATS, when switching to another power source, the voltage difference will cause a huge current impact, which will affect the performance and even life of the load

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