Substation DC System Abnormality Analysis And Anti-accident Measures Research

Electricity energy has become more and more important in daily life. Power system must work safe and rel iable to insure the normal of power supply system. So DC power system must work reliable, which is the core of power system, transformer substation.The question of DC system has become the main question about safe operation of trans format ion substation. The relay protection or the signal of electric monitoring system will abnormal operate when an exception occurs on dc system,and more it will cause serious result of the electric power system. This paper describes the main composition and design principle of DC power system, and the problem of joint earth is fully analyses, which is the important reason that causes the DC power system to refuse action or act abnormal. This paper analyses the operating characteristics of break and fuse, describes the main problem on Staged difference coordinations of DC system, and the reasonable proposals are given to choice the breakers and the fuses in DC system. At last, this paper compares the pro and con of all kinds of insulation monitoring technique through the analysis and research of several popular insulation monitoring techniques, and then decides to adopt the way of imbalanced electronic bridges and the inserting signal method.