In order to realize simulation research on the discharge characteristics of complex gap in live working

we put forward a physical discharge model for complex gap based on the mechanism of streamer-leader inception and development and experimental observation.Considering the influences of the worker and discharge space charge

we established a calculation method of space electric field by charge simulation method（CSM）

and calculated the breakdown voltage

spatial location of leader and streamer

and space charge in the complex gap by coupling with the inception and development of leader-streamer.Besides

the simulation research indicated that the variation of accumulated space charge and leader inception caused by the working position have bidirectional effects on the discharge development

and the lowest discharge position is about 0.4

0

.45 m away f

rom the high voltage conductors.The simulation results show good agreement with the actual measurement values.