The occurrence of breaking overvoltage in a DC circuit breaker (DCCB) poses a potential threat to the safe operation of a DC grid. Based on the structure of the ±10 kV three-terminal DC distribution network

this paper sets up the medium-voltage DCCB and formulates a fault protection strategy. Additionally

a simulation model of the system is developed to analyse the overvoltage characteristics within the DC distribution network across different nodes and fault conditions. By examining the factors that influence breaking overvoltage

this paper unravels the fundamental mechanisms associated with DCCB-related overvoltage generation. Furthermore

the paper suggests measures to alleviate DCCB overvoltage. These insights provide a theoretical and technical basis for the design and operation of DCCBs within DC distribution networks.