When maintaining or troubleshooting the system,sometimes misoperation occurs,which happens to those who frequently perform system maintenance or who are new to system maintenance.Generally,when modifying the control logic,downloading software,restarting the device or forcing the device,the protection signal is the most prone to misoperation.In light cases,some measuring points and equipment are abnormal,and in heavy cases,the units or main auxiliary equipment are out of service,and the consequences are very serious.In the chemical plants used,failures caused by human error account for a large proportion of unsafe incidents.
对系统进行维护或故障处理，有时会发生认为误操作现象，这对于经常进行系统维护或新参加系统检修维护的人员来说都是会发生的。一般在修改控制逻辑、下装软件、重启设备或强制设备，保护信号是最易发生误操作事件。轻则导致部分测点、设备异常，重则造成机组或主要辅机设备停运，后果是非常严重的。在使用的化工厂，人为误操作发生的故障在不安全事件中占有很大比例。
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