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针对华能上海石洞口第二发电厂的厂用系统 40 0 V保安母线电源自切控制回路 ,存在开关控制回路或开关辅助接点经常发生故障 ,若运行方式改变或开关在检修状态时 ,不能实现自动切换 ,以及无直流电源监视等缺陷 ,进行深入的分析并找出原因。根据实际运行情况加装了双位置继电器、位置选择开关和直流电源监视继电器 ,完善了保安母线电源的自切回路 ,提高了保安母线供电的可靠性
For Huaneng Shanghai Shidongkou second power plant plant system 40 0 V security bus power supply self-cutting control circuit, the existence of switch control circuit or switch auxiliary contacts often fail, if the operating mode is changed or the switch is in maintenance state, can not be achieved automatically Switching, and no DC power monitoring defects, in-depth analysis and find out the reason. According to the actual operation of the installation of a double position relays, position switches and DC power supply monitoring relay, improve the security bus power supply self-cut circuit to improve the reliability of the security bus power supply