Why do we need a grid with self-healing capabilities?--Recloser controller with 4G/5G communication as the cornerstone at its coreDriven by both energy transformation and digitalisation, the power grid is evolving from a traditional one-way power supply model to an intelligent, self-healing one. The recloser controller based on 4G/5G communication technology has become the core equipment for building a self-healing power grid by virtue of its ‘sensing-transmission-processing-decision-execu