Circuit breaker arcing time control device and method

The invention discloses a circuit breaker arcing time control device and method. The control device comprises a charging transformer, a capacitor group, a rector, a first medium-high-voltage fast switch, a second medium-high-voltage fast switch, a charging resistor, a charging switch, a rectifier and a control circuit, wherein the control circuit is used for controlling the first medium-high-voltage fast switch or the second medium-high-voltage fast switch to be switched on, and when two groups of ultra-high-speed switches are respectively connected in series and connected in parallel with a circuit breaker, a serially connected switch is switched on, so that a single-frequency oscillating circuit is conducted; voltage is exerted on the circuit breaker, so that the circuit breaker under a certain opening range generates self breaking arcing; when the arcing time reaches the required time, the parallelly connected ultra-high-speed switches are switched on for current transfer, so that the circuit breaker realizes the arc extinguishment. The dispersivity of the ultra-high-speed switch is very small, so the closing time sequence accuracy of the two groups of switches is ensured; the closing time sequence control is completed through the control circuit, so the arcing time of the circuit breaker can be precisely controlled, in addition, the circuit is simple and reliable, and the realization is easy.