Optimization of turbine emergency trip system with 300 MW

YE  Fei
（Wujing Thermoelectric Plant， Shanghai Electric Power Co. Ltd.，  Shanghai  200241， China）

Abstract：  In order to improve reliability of the existing emergency trip system （ETS） of the 300 MW unit in a power plant，programmable logic controller（PLC） technology were applied to the protection system to realize the control logic. Firstly，the logic connection between measure points and manipulated variables was established based on the protection principles，then，the double nets dual machine double power supply for the PLC control system was put forward to optimize it. The optimization job of the emergency trip system of two 300 MW units was completed in Wujing Thermoelectric. The results show that using the optimization technology will greatly avoid the single point measurement fault，abnormal protection movements caused by single control circuit and single power.
Key words： emergency trip system （ETS）；relay logic controller； pressure transmitter