Three-phase independent speed measuring device for circuit breaker

The invention discloses a three-phase independent speed measuring device for a circuit breaker. The circuit breaker three-phase independent speed measuring device comprises a host and a speed testing sensor. The host comprises a main controller, an opening and closing control module, a current sensor, a voltage sensor, a direct-current power supply and a photoelectric isolation module; the voltage sensor is used for collecting stroke displacement data of the contact; the photoelectric isolation module is used for separating a low-voltage control signal of the opening and closing control module so as to acquire the opening and closing time of the coil; and the main controller is also used for constructing a time travel characteristic curve according to the closing time and the travel displacement data. According to the embodiment of the invention, the speed data of each phase of contact of the tested circuit breaker can be measured by opening and closing once, the tested circuit breaker does not need to store