Signal processing technology in program design of monitor LCU for Three Gorges Hydropower Plant

The basic requirement to the LCU program design is to ensure the monitored equipment with safety and sta- bility.The basis is the signal must be reliable,credible and reasonable.As a result of multi monitoring object,multi measured point,multi type,multi transmission link,changeable and complicated,the mono-signal is not able to satisfy the requirement.The paper sums up the signal collection and preprocessing technology,discusses the signal lockout technology,emphatically introduces the lockout logic technology in program design of the monitor LCU for Three Gorges Hydropower Plant.