Device and method for measuring opening and closing speed of circuit breaker

The invention relates to the technical field of circuit breakers, in particular to a device and method for measuring the opening and closing speed of a circuit breaker. The device for measuring the opening and closing speed of the circuit breaker comprises a transmission plate, a plurality of gears, a mounting frame and a speed sensor, wherein the plurality of gears which are sequentially meshed are rotationally mounted on the transmission plate in the length direction of the transmission plate. The mounting rack is fixedly mounted on a casing of the circuit breaker, and the speed sensor is movably mounted on the mounting rack. A gear at one end of the transmission plate along the length direction can be connected with a measuring rotating shaft of a crank arm of the circuit breaker, and a gear shaft of a gear at the other end of the transmission plate along the length direction is in transmission connection with the speed sensor and is the same as the crank arm in rotating direction. When the measuring metho