The main means of open wire overhead lines, erected above the ground, is the transmission line insulators mounted on the tower upright in the ground to transmit electricity transmission lines. Erection and maintenance more convenient, low cost, but vulnerable to meteorological and environmental (such as wind, lightning, dirty, snow, etc.) caused by the impact of failure, while the entire transmission corridor of land area occupied more easily cause electromagnetic interference on the surrounding environment . The main components of overhead lines are: line conductors and lightning (overhead ground wire), towers, insulators, fittings, tower foundation, wire and grounding devices.