For modern power system

the increasing system capacity

the interconnection of regional large power grids

and the rising line load have made the short-circuit current far surpass the current breaking capacity of circuit breakers. So excessive short-circuit current governance has become an urgent topic for power grid companies. In this paper

the principle and working logic of the deep limiting device of current based on the zero-loss deep current limiting principle are analyzed

the zero-loss deep current limiter is introduced

and an actual 330 kV power grid is simulated and calculated. Results show that the zero-loss deep current limiting device can temporarily isolate short-circuit fault of the power grid

and significantly reduce short-circuit current.