Abstract: Traditional tripping escalation in 10 kV distribution networks, which expands the outage range, occurs from time to time, affecting customer power supply reliability and reducing the user experience. Based on the existing configuration of 10 kV distribution automation switches, this paper optimizes the protection grading settings of automated switches to achieve proper time coordination, enabling rapid fault localization and isolation. Combined with practical engineering cases, it verifies the actual effect of graded protection in reducing customer outage hours, improving power supply reliability, and reducing complaints about frequent outages.