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Research on reducing grounding resistance of transmission line tower grounding grid

In order to improve the lightning withstand level of transmission lines, to reduce line lightning trip-out rate and the accident rate, to improve power supply reliability, grounding resistance in grounding grid of transmission line tower should be effectively ameliorated. As to the transmission line tower grounding grid in the plateau mountainous with thin soil, dry soil and complex geological conditions, the grounding electrode landfill layer is shallow and grounding resistance is significantly higher. Improvement of grounding grid and application of special resistance reducing material can reduce the the grounding resistance effectively. This technology has been applied to an actual construction reformation of transmission line tower grounding grid. The comparison of the test results verifies that grounding resistance can be effectively reduced by using a combination of above methods in complex geological environment.