In this paper

the 110 k V lightning arrester fault of a substation is analyzed by means of electric inspection

diagnostic test and disintegration inspection. It is caused by the penetration flashover of epoxy resin tube inside the lightning arrester

which leads to the earth fault of the lightning arrester body. It is pointed out the charged particles emitted during the lightning arrester failure cause the three-phase short-circuit ground fault of the same interval voltage transformer. Through defect analysis

it can improve the design

overhaul and operation and maintenance level of metal oxide arrester

and can provide technical reference for manufacturers

maintenance and maintenance personnel to analyze and deal with such faults.