中文摘要：

发电厂厂用电在发电厂正常运行中起着至关重要的作用，它确保着主设备（锅炉、汽轮机或水轮机、发电机、核电站堆芯控制）和辅助设备的运行，厂用电一旦失电进入小岛运行状态，将对主辅设备的安全造成严重影响，甚至发生严重后果。结合电厂的实际情况及有可能遇到的各种事故，甚至灾难对发电厂小岛运行的影响进行分析讨论，提出需要注意的事项及解决方法，进而提高厂用电的安全可靠性，以期减少对设备及工作人员造成的影响与危害。

英文摘要：

The auxiliary power in power plant plays a crucial role in normal operation of power plant, which ensures the operation of main equipment （ boiler, steam turbine or hydro turbine, generator, control of nuclear reactor core） and other auxiliary equipment. If the auxiliary power has lost the power, the power plant will come to an island operation and the security of main and auxiliary equipment will be severely affected, even resulting in a serious consequence. The actual situation of power plant, the kinds of potential accidents, even the influence of disasters on the island operation of power plant are discussed, and the remarkable matters and resolution methods are proposed so as to enhance the security and reliability of auxiliary power, which will reduce the effects and hazards on the staff and equipment.