In order to explore the influence mechanism of the lightning towers composed of different materials on their own lightning triggering ability, numerous discharge experiments with standard negative switching impulse were conducted on two lightning tower models which made of angle steel and epoxy resin respectively and scaled in ratio of 12.5:1. The gap discharge tests of the lightning tower were divided into two parts: single-tower gap distances of 1 m, 3 m, 5 m and 7 m, and selective discharge of double towers. Up-and-down method was used to obtain the 50% discharge voltage of the two towers under different gap distances in the tests, and high-speed camera system was used to observe the discharge process. Test results showed that the breakdown voltage of the steel tower at different gap distances was lower than that of the composite tower in single-tower gap discharge tests; the percentage of flashing of the steel tower was 44% higher than that of the composite tower in the selective discharge of double towers. The lightning triggering ability of the steel tower was better than that of the composite tower. The conclusion of the test provides a reference for construction and design of the lightning towers. The effect of lightning triggering measures for the lightning towers could be improved by changing materials of the tower, so that the transmission line could be better protected.
KEY WORDS :lightning tower;lightning triggering ability;scaled model test;up-and-down method;breakdown voltage;gap discharge;
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