Abstract: Feeder automation (FA) is a key technology for enabling rapid fault isolation and service restoration in distribution networks. The accuracy of fault location plays a crucial role in ensuring power supply reliability and improving customer satisfaction. However, in practical operation, FA systems may fail in location due to signal delays, terminal offline issues, and false signal transmission. Taking the expansion of the fault location range of the 10 kV Hongqi Line FA in a certain region in 2024 as a case study, this paper systematically reviews the basic theory, startup conditions, and signal processing procedures of FA. It focuses on analyzing the impact of signal delay and terminal offline on FA decision-making logic and proposes improvement measures. The results provide references for related case studies.