DEH系统电源故障分析处理与预控

Power Supply Fault Analysis and Pre-Control of DEH Control System

DEH系统负责汽轮发电机组转速和负荷控制,其系统电源的可靠性是火电机组安全、稳定运行的关键因素之一。本文首先分析了主汽门位置变送器供电电源设计不合理导致再热器保护误动,DEH系统电源分配模块老化故障导致机组跳闸,DEH系统电源故障造成AST电磁阀失电导致机组跳闸等故障案例,提出了故障处理和防范措施。随后总结出DEH系统电源故障的防范措施,包括搜集同类型机组故障信息,开展设备使用周期管理等,并给出审查回路电源设计合理性,定期更换电源模块,检修时应进行回路电源测量与记录,优化电源报警和电源的日常巡检等建议。

DEH system is responsible for speed and load control of turbo-generator set.The reliability of power supply is one of the key factors for the safe and stable operation of thermal power set.This paper first analyzes the fault cases of reheater protection misoperation caused by the unreasonable design of power supply of main valve position transmitter,DEH system power distribution module aging fault caused by unit trip,DEH system power failure caused by AST solenoid valve power loss caused by unit trip,and puts forward the fault treatment and prevention measures.This paper then summarizes the DEH system power failure prevention measures,including fault information collected the same type unit,equipment life cycle management,etc.,and rationality,replaced periodically review power circuit design is given power supply module,maintenance should be done when the circuit power measuring and recording,optimize power supply alarm and power of daily inspection.