Abstract: In order to improve correctness and accuracy of fault handling during production process of large-scale thermal power units, the trend, law and characteristics of faults in the process were revealed, key points, and inducing factors and critical points of fault trend were quantitatively analyzed. Then, "tree structure" fault response strategy was put forward, and corresponding methods for different fault sources and classifications were proposed and described in detail. Meanwhile, precautions for fault handling during power generation were summarized. The results show that the "tree structure" strategy and methods can improve operational personnel's fault handling efficiency. And by taking relevant methods in terms of fault source type, equipment type, unit status, etc. can provide help for handling faults of large thermal power units, and reduce human errors.

Key words: thermal power generating units, human error, tree structure, accidents handling strategy, inducing factor