Research on Precise Self-Healing with Multi-Level Differential Control in Distribution Network Automation

The contradiction between the expanding scale of urban distribution networks and the growing demand for highly reliable power supply has become increasingly prominent. Focusing on the technical practice of "multi-level coordination and precise self-healing", this paper proposes a fault-handling system that integrates optimized differential protection, intelligent switch numbering, and reconstructed self-healing strategies. By establishing a four- or five-level differential Control architecture, combined with the iterative application of time coordination and self-healing logic in spring-operated or permanent magnet-operated circuit breakers, the system achieves precise fault isolation and rapid power restoration in non-fault areas. This provides a replicable solution for improving the reliability of high-density urban distribution networks.