The suspension insulator string has the condition of glass disc insulator falling off by self explosion, which brings hidden danger to the safe operation of substation. Glass disc insulator self explosion has the characteristics of "early exposure, decreasing year by year". From the perspective of safe operation of substation, the residual hammer after self explosion should be replaced with new insulator in time.
The reasons are as follows: 1. The effective insulation length of insulator string will be affected after the self explosion of glass insulator. When the effective insulation length of insulator string is lower than the minimum effective insulation length of insulator string, the insulator string will be broken down by high voltage current, causing line trip and safety accident. 2. If the glass insulator after self explosion is not replaced in time, it may cause the steel foot of the residual hammer insulator to be burnt out and the insulator string to fall under the condition of lightning stroke or pollution flashover.