厦门莫格电气自动化有限公司
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现地级机组LCU的功能
2.1 数据采集及处理
1) 开关量采集及处理
状态开关量的采集及处理:机组LCU按周期扫查全部开入量,进行状态检查,更新数据库,在开关量发生变位时,可以产生事件记录,并根据控制流程进行动作处理或接点复归处理。处理内容事先由设计人员根据机组的运行要求编写在控制流程之中。当事故类信号变位时,LCU根据流程控制机组进行事故停机。如属于故障类信号变位时,LCU则进行登录和报警处理。所有事件记录,流程的执行情况不仅保存于机组LCU,还全部送厂级监控层。在状态开关量中,有一种综合开关量,这实际是一种若干个开入量按一定逻辑关系得到的一个中间变量,此量可供-LCU或装置使用,如机组空载状态,机组发电状态等即属于这一类,往往以开出的方式引出,或仅作为LCU本身内部的一个宏变量供流程使用。机组LCU状态开关量共有90多个,这些量包括:断路器的开/合,导叶的位置,油位的高低,油泵的启、停等。
中断开关量的采集与处理:中断开关量具有中断能力,响应速度快(<10ms),可按其变位发生时间的先后形成事件顺序记录。水轮机、发电机、瓦温过高、压力油泵、过速信号、机组的励磁、保护等事故信号作为中断开关量输入,共20多点。机组LCU一旦收到这些表明机组发生事故的信号,会立即中断当前的工作,快速转到事故流程进行处理。并按要求形成事件顺序记录。
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