In order to solve the technical problems of mechanical DC circuit breaker

such as difficulties in realizing fast reclosing and in judging the direction of breaking small current and high cost of hybrid DC circuit breaker

this paper presents an economical DC circuit breaker topology with reclosing function. Firstly

combined with the topology working mode

the principle of current natural transfer based on arc voltage and forced transfer based on power electronic devices are studied. Secondly

according to the measured parameters

a system model is established to simulate the breaking process of fault current

load current and small current

and to verify the breaking performance of different currents. Finally

the feasibility of the scheme is verified by the breaking test of the prototype. The results show that the scheme can realize the functions of fast reclosing within 40 ms and fault current truncation within 3 ms

and it can reduce the number of electronic devices

which provides a new idea for the research of economical DC switchgear.