It can be traced back to 1 7th century at the earliest, but it was not until1903+065438+1October/0/day that a magnetic storm broke out, which was first associated with power system anomalies. The new york Times 1 1.2 reported the phenomenon that solar storms interfered with the power system. The article said that in Geneva (46 14'), "... unexpected grounding current suddenly paralyzed all electrical equipment and trams, and no measures were effective" [2].

DC magnetic bias is very harmful to the normal operation of power system. 1 March, 989 13 magnetic storm event (also known as Quebec event), two 735kV step-up transformers of Quebec (46 5' N) hydropower station in North America power grid were burned, seven SVC tripped within 59 seconds, and1200t capacitor was destroyed. After 25 seconds, the system voltage collapsed, which eventually led to Quebec. A giant transformer and a large number of transmission lines in a nuclear power plant in New Jersey (40 13'N' n) were burned, and several transformers were damaged and tripped, resulting in losses as high as120,000 USD [4]. The reactive power and active power of England (5130' n) interconnected with Seagren area fluctuate greatly. Two 400/ 132kV and 240MVA transformers located in Norwich and Empress India failed respectively, and the maximum current flowing through the neutral points of the transformers was 320A. ..