The causes of the low load transfer rate of the ring network in the medium voltage distribution network are analyzed. It is proposed to optimize the partial load access points by changing the state of branch contact switches and reduce the load factors of the main feeders in the mesh-networking. The planning strategy can satisfy the conditions for safety verification at the minimal transformation cost. A feeder load balancing optimization model for radial distribution network based on Distflow is proposed to meet the feeder constraint of “N-1” load and network topology constraints. The second-order cone relaxation technique is applied to convexly relax the mixed integer nonconvex nonlinear programming so that the former condition can be transformed into a mixed integer second-order cone problem that can be efficiently solved. In order to verify the feasibility and effectiveness of this model

the model is tested by 68-node and 34-node distribution networks. The results show that the feeder can satisfy the requirements of automatic supply transfer only by reconstruction

and to some extent

can improve the economics of the distribution network operation.