Speed detection method for opening and closing actions of rapid high-voltage circuit breaker

The invention provides a speed detection method for the opening and closing action of a rapid high-voltage circuit breaker, and the method comprises the following steps: fixedly connecting a synchronous rod to the end face of the outer end of a transmission shaft in linkage with the opening and closing action, and sequentially sleeving the synchronous rod with a spring type optical fiber speed sensor and a fixed plate; the spring type optical fiber speed sensor, the laser and the signal processing unit form a signal detection system, the laser emits a modulated narrow-band light source, and the narrow-band light source enters the signal processing unit after passing through the spring type optical fiber speed sensor; during opening and closing actions, the transmission shaft drives the synchronous rod to move and is matched with the fixed plate to enable the return spring to deform, and a power loss signal of the narrow-band light source is obtained through the signal processing unit; and according to the cor