Power system is of great significance to the improvement of people's living standards and the development of social economy. Although China's power technology is becoming more and more mature, but under the influence of some factors, it is still easy to have trouble, threatening the security and stability of power system operation. Through the use of relay protection device, it can effectively find and deal with abnormalities and faults, reduce the adverse effects of faults, ensure the healthy operation of power system, and the probability of large-scale power operation faults can also be significantly reduced.
Key words: power system; relay protection; fault analysis