Abstract: Aiming at various problems existing in maintenance of the watercollecting well of Hebei Huadian Hybrid Pumped Storage Hydropower Company Limited, the power system of the watercollecting well was configured redundantly, the power supply system of the programmable logic controller was reformed, and the control process of the watercollecting well was optimized. After the reformation, the power system and the control system of the watercollecting well are all configured redundantly, so the reliability of the system was improved greatly.

Key words: programmable logic controller (PLC), redundant configuration, optimized design, control process, water-collecting well