Abstract: Nanjing Power Supply Company is actively promoting distribution network feeder automation (FA) technology configuration, which not only shortens fault handling time and improves power supply reliability, but also brings new challenges to power system monitoring work. According to the actual work situation, this paper analyzes the substation switch action information and signals when the distribution network applied with FA fails, and further proposes improvement methods of the fault reporting and signal monitoring to improve the accuracy of power system monitoring work.