| In recent years, as China's rapid economic development, electric power construction is also accelerating, size of the system goes up doubly. But at the same time, the increasing scarcity of land resources, becomes the main factors which hinder the construction of power system, Specifically the construction of overhead transmission lines.Yet several-circuit line on same tower is an important way that improve the transmission line corridor capacity and resolve the contradictions.As with the fault of four-circuit line on same tower on the impact of very large power system, Moreover, the project is on the area of thunderstorm days over 70 days.Including Lightning and other conditions,it threatens badly the safety line insulation. Focus is therefore necessary to consider the same four-circuit transmission line tower with the problem of insulation.According to 500kV (Guangzhou) Shiyang to (Jiangmen) Guishan Transmission Line Project in the planning of the tower type, refering to computational method with reference to domestic and foreign, Using of "ATP / EMTP" computer program.Focus from four-circuit line on the same tower to the situation simulation about back flashover and shielding failure, and making a choice based on the results of the insulator phase conductors of different length.Then according to some corresponding criterion and research result,from Frequency voltage ,overvoltage,lighting overvoltage it analyses phase to ground,phase to phase and other Clearance of air required distance. To arrive at economically reasonable and safe operation to meet the needs of line insulator length and air gap electrical values.
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