汽轮机紧急跳闸系统(ETS)是火电机组的重要保护之一.依据有关规程及安全评估要求,对湖南省内主要300 MW火电机组ETS调查发现,多数机组的ETS在不同程度上存在电源配置不合理、声光报警不完善、停机按钮接线和信号取源不当等问题.对此,提出了保证具有2路可靠的进线电源、增加电源监视功能、完善声光报警装置、TSI超速停机至少引入2对信号线至ETS等改进措施.%The emergency trip system (ETS)of steam turbine is one of the important protection for thermal power units. Based on related regulations and requirements of safety evaluation,an investiga-tion of EPS for main 300 MW thermal power units in Hunan Province has been carried out,it has dis-covered that the problems existing in ETS of many units are in different degrees as follows: unreasona-ble allocation of power source,imperfect opto-acoustic alarms, unsuitable wire-connection and signal -collecting source for push botton of shutdown etc.. For these,some improvement measures,such as ensuring the power source to have two-loop reliable incoming wires,adding function of power source monitoring,perfecting opto-acoustic alarm devices, and the TSI over-speed shutdown has at least to lead two pairs of signal wires to ETS etc. ,have been put forward.
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