摘要：than they were authorized to do to meet the rising demand during the summer [1]. Similar phenomena occurred in other parts of the world including grid failure in Quebec region of Canada on 13'* March 1989, North eastern America on 14th August 2003, South Brazil on yyth March 1999, Whole Italy on 28'* September 2003 and London 28" August 2003. The common factor of most of the regional grid failure is due to changes in the Sun-Earth weather. Solar storms can influence ionosphere which perturbs the magnetic field of the earth [2].
