In order to solve the deterioration in system stability and the increase in difficulty of operation and maintenance caused by multiple functional chips in substation relay protection, this paper proposes a self-developed SoC chip for intelligent outdoor installation protection based on a dual-core Cortex-A9. First, the chip adopts the HSR ring network structure based on the node redundancy algorithm to ensure that when any component or link in the ring is blocked, message will still be transmitted to the host in another direction. Then, with a multi-rate multichannel dynamic reconfigurable ADC acquisition module in the chip, the software of chip can be modified according to different real-time requirements. Besides, clock data recovery is used to process FT3 code stream to improve the reliability of information transmission. The floorplan and layout design of chip are presented through UMC55 CMOS process. The total area is 5.3 × 5.3 mm and the main clock frequency can reach 500 MHz. The proposed chip is verified to be feasible and advanced through simulation results. This work is supported by Science and Technology Project of State Grid Corporation of China (No. 5222LK17001F).