As single-phase grounding fault occurs in transmission line

the short circuit fault cannot be eliminated in time

the circuit breakers on both sides may close short circuit fault during reclosing operation. Operating experience shows that the short circuit current flowing through the breaker has the phenomenon of delayed zero-crossing when the breakers on both sides close the short circuit fault

which cause circuit breaker to interrupt the fault. By establishing a single-phase equivalent circuit model

this paper theoretically analyses the expression of short circuit current flowing through the breakers on both sides of the fault line under different closed conditions. The conclusion shows that due to the change of circuit topology caused by the later closed circuit breaker

the short circuit current flowing through the first closed circuit breaker may delay zero-crossing. Furthermore

the effects of initial phase angle α

interval time Δt and amplitude ratio K on short circuit current are analyzed and discussed. Finally

taking the closing short circuit faults of circuit breakers on both sides of power plant output transmission line as an example

building a simulation model in PSCAD/EMTDC software

the short circuit current waveforms and delay zero-crossing phenomena of circuit breakers are calculated and discussed.