600MW直接空冷机组DEH系统故障原因分析与改进措施

DEH System Fault Analysis and Processing on 600 MW Direct Air Cooling Unit

内蒙古上都发电有限责任公司3号机组正常运行时发生DEH跳闸故障,DEH跳闸无首出原因。按照DEH系统发出的"高压保安油建立信号消失"信号的传递路线进行了检查与分析,认为机组DEH跳闸逻辑设计不符合规程要求、保护信号存在由同一继电器引出情况,是引发故障的原因。根据故障原因与机组实际状况,给出了相应的改进措施。

DEH tripfault oeeured in the normal operation of unit 3 in Inner Mongolia Shangdu Power Plant Co.,Ltd., but without the DEH first trip reason. Aeeording to the high pressure oil based signal disappears signal＇s route that the DEH system issued, the fault reasons were examined and analyzed, believed that the unit DEH trip logic design was not in accordance with the requirements of regulation, and the protection signals was transferred by the same relay. According to the actual eondition of the fault eauses and the unit itself, gave the corresponding improvement measures.