Abstract: Studies on the comprehensive optimization of thermal protection are of great significance for the safe and reliable operation of power plants. Through the overall analysis and studies on the protection system of Jiangsu Kanshan Power Plant, a comprehensive optimization plan is proposed. The plan includes using triple redundancy increasing, auxiliary judgment and related system reference (with the processing course in consideration) to implement system and auxiliary equipment protection control to ensure that the distributed control system(DCS) can not only operate correctly in case of equipment failure, but also determine the operating conditions of the major systems and auxiliary equipments precisely when the measuring points and auxiliary connections are abnormal. Since the plan is fully implemented, there has been no malfunction or failure of the thermal control system, which demonstrates that the correctness and reliability of the unit protection system are effectively improved.

Key words: thermal generating unit, comprehensive optimization of thermal protection, research, implementation