Abstract:After the distribution line is basically realized by hand - in - hand power supply,the uninterrupted power load can be transferred through the closing and breaking loop operation,which effectively improves the reliability of power supply. However,the operating state of the system after closing and breaking loop operation is unknown,which makes the operation bear certain risks. The auxiliary system analysis is applied to effectively reduce the blindness of closing and breaking loop and improve the success rate of the uninterrupted power load transfer,and then to improve the reliability of power supply,which make the operation and management of distribution network more reliable,reasonable and efficient.