火电厂脱硫分散控制系统信号干扰故障分析

Fault analysis on desulfurization DCS signal interference in a thermal power plant

某火电厂脱硫分散控制系统多次出现信号干扰,严重影响机组稳定运行。介绍了6次信号波动情况,从干扰源、传播途径、敏感体等方面进行了排查,提出了改造路灯供电回路、规范分散控制系统接地、清理电缆沟等整改措施。整改后系统运行稳定,未再出现信号干扰现象。

The desulfurization DCS of a thermal power plant suffers from multiple signal interference,which seriously affects the stable operation of the unit.Six signal fluctuation situations are introduced and troubleshooting is made from interference sources,propagation paths and sensitive bodies.Rectification measures such as renovating the road light power supply circuit, standardizing the DCS grounding,cleaning the cable trench are proposed.After the rectification,the system is more stable and there is no signal interference in it.