"220kV电网继电保护与自动装置设计：确保电能系统运转安全与稳定的关键"

dern production and daily life. Without electricity, society cannot function normally. Given the importance of electricity to social development, maintaining electricity is particularly important, and relay protection is crucial to the normal operation of power systems. Relay protection can ensure the normal operation of power systems, quickly eliminate faulty parts, ensure the rapid restoration of fault-free parts, not only ensuring the normal operation of social life and economy but also protecting people's lives and property. This design focuses on the relay protection and automatic device setting calculation for the 220kV transmission line, including the design of electrical main lines and the selection of major electrical equipment, the formulation of system operating modes, the selection of neutral grounding points in transformers, the distribution of maximum load flow, the setting calculation and verification of relay protection devices. Based on the characteristics and operational requirements of this power grid, the best solution is sought, configuring zero-sequence, distance, high-frequency, and phase comparison protection, and finally evaluating the entire set of protection systems. Keywords: relay protection; 220kV; setting calculation.