Fault analysis of cement pole and wire in 110kV transmission line

Abstract

The trip on the 110kV transmission line was caused by the collapse of cement pole and disconnection of wire. A series of tests including macro check, dimensional measurement, mechanical property test and metallographic observation, have been carried out for the failure investigation. The experimental results showed that the failure of #43 pole was caused by combination of the rusting and breakage of transmission line under corrosive conditions and the unqualified hoops cannot bear the impact load and unbalanced tension of broken wires. At the same time, the corresponding supervision measures concerning about the design and purchase of materials used in Grid system and operation and maintenance inspection requirements were also put forward.