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Development of Sequence Control System of Main Auxiliary Equipment and Accessories in Thermal Power Plant

YAN Yu-ping;ZHOU Ming  
This article retrospects the development of sequence control system in thermal power plants at home and abroad, especially introduces the three developmental stages of sequence control system in China over the past 35 years,i.e.: l.startingstage;2.the second stage with programmable logic controller(PLC ) as core hardwares; and 3.the third stage with sequence control systems Of main and auxiliary equipment incorporated into the distributed control system (DCS) and with field bus controlsystem (FCS) got involved.This article also appraises the features of sequence control system composed of different configUrations and looks forward to the developmental tendency of this system for the next century.
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