Analysis and Countermeasures Discussion for Large Area Icing Accident on Power Grid

In this paper, the characteristic and cause of large area icing accident on power grid is analyzed. It is pointed out that the continual serious weather conduces insulator icing, excess icing load, differential icing,which cause tower falling down and wire broken, icing flashover, conductor gallop,network splitting, large area outage and so on. In combination with the problem reflected from the destruction of power grid, it is presented that the countermeasures should be taken from ice area division, route selection, icing monitoring and prewarning, emergency operation mode, icing removal method,ice melting technology and device etc. for reducing the influence and destruction of icing. According to the character of the large area icing accident, the following research content is presented, which contains destruction character of tower, line icing monitoring and prewarning, standard of line design, character of icing flashover, icing removal and melting method ect.