This set of smart sensors allows the telemetry to the Operations Center in DNP3 protocol of 67 digital and analog parameters of the status of medium-voltage power transmission lines. Among the parameters, the fault currents in each phase, permanent faults, angle and module of the current per phase, the reversal of the current flow stand out, ensuring the energy is consumed downstream of its location. The devices are maintenance-free and serve as advanced equipment in autonomy, measurement capabilities, and communication and data server architecture.