三相交流电在国民经济中应用广泛，电路的畅通对工业生产极为重要。由于某种原因造成某相交流电断电，会造成重大的经济损失，因而对线路的检测是十分必要的。单片机三相交流电断相远程报警器，以8051单片机为核心，对三相线路进行不间断检测。当某相线路断电时，不仅可进行近程声光报警，还可进行远程声报警。-Three-phase alternating current widely used in the national economy, the circuit flow of traffic on the industrial production of paramount importance. For some causes of a phase AC power, will cause major economic losses, and thus the line detection is very necessary. SCM-phase long-range three-phase alternating current alarm to 8051 as the core, non-stop for three-phase circuit testing. When a phase power line, not only can be short-range sound and light alarm, sound alarm can also be remote.