Smart electric meters are smaller than mechatronics smart meters. They have higher reliability, and lower power consumption. However, the service life and reliability indicators of fully electronic smart meters are problems that need to be resolved urgently. The failure mechanism of electronic meters is different from that of mechanical meters. The failure mechanism of mechanical meters is of mechanical wear type. Once a failure occurs, the meter’s degree is still there and its impact is relatively small. The failure mechanism of electronic meters is sporadic. Once a failure occurs, it may cause no electricity, no display, or loss of historical measurement data, which will bring immeasurable economic losses to the grid. At the same time, electronic meters have weaknesses such as poor anti-interference ability.
To solve this problem, we try to add an intelligent self-locking function to the circuit breaker controller of the electronic meter. Taking into account that the internal space of the smart controller of the electric meter is relatively small, the gear motor should drive the stable operation of the loop control system in a limited space, and it is only allowed to rotate in the specified direction and cannot go backwards. We use 10mm planetary gearheads and turbine inserts to be injected into the loop controller gearbox, so that the transmission structure has the characteristics of small size, large torque and can meet the needs of self-locking function. The loop controller gearbox in this scheme can realize the reverse self-locking of the electric meter, which can only transmit the power of the active end of the motor without responding to the external load, thereby isolating the external load from the smart meter’s own mechanism. In case of possible damage, the smart meter can be stopped at the gear motor (also called the gear motor of the loop controller) to increase the service life of the smart meter, solve the problem of data loss when the power is suddenly cut off, and protect the safety of the data.