DC distribution networks have the advantages of high efficiency

stability

adapting to renewable energy

and hybrid DC circuit breaker (HCB) is the key equipment to guarantee fault isolation and recovery of the DC power system. In order to overcome the limitations of existing DC circuit breakers (DCCBs)

such as high on-state loss

poor economy

and lack of reclosing capability

a thyristor-based oscillating hybrid DC circuit breaker (OT-HCB) is proposed in this paper

based on the characteristics of the LC circuit and thyristor switching. The breaker applies thyristor to provide current path for the LC oscillating circuit

thereby enabling the mechanical switch to break the fault current under zero-voltage zero-current condition after current commutation

and realizing the integrated module design of fault current commutation and breaking. Meanwhile

the proposed hybrid DC circuit breaker exhibits reliable and rapid reclosing protection capability. Moreover

based on the analysis of the topological configuration

fundamental operational principles

and key parameter design criteria

simulation and evaluation of interruption performance under diverse fault conditions are carried out in PSCAD/EMTDC

along with the construction of a reduced-scale experimental prototype. This investigation employs integrated theoretical and experimental validation methodologies to assess the technical applicability and economic viability of the proposed hybrid DC circuit breaker.