For 11 kV substations (generally understood as 10 kV/0.4 kV user substations or packaged substations), Acrel’s solution is not a single product, but a layered and distributed system covering protection, monitoring, temperature measurement, power quality, and environmental auxiliary functions. The core concept is to replace traditional relay protection with microcomputer-based protection devices, use intelligent control and wireless temperature measurement to address safety blind spots in high-voltage switchgear, and then integrate all data into the Acrel monitoring system for centralized management, enabling standardized operation and maintenance with “unattended operation and minimal staffing.”