Optimization Design for 500 kV Four-Circuit Transmission Lines on Same Tower

With the development of society and economic growth, the research on the multi-circuit transmission lines on same tower has been put on the agenda. Multi-circuit lines on the same tower can greatly save power transmission costs, but due to the small distance between phases, the mutual influence of the phases causes the electric field to change. This paper calculated the electric field in the design drawings of the 500 kV four-circuit linear tower on the same tower provided by North China Design Institute, and found that the electric field in some areas did not meet the design requirements. The parts that do not meet the requirements are optimized, and the final maximum surface electric field is 2100 kV/mm, which is lower than the control value of 2300 kV/mm, and the maximum surface electric field at the connection is lower than 800 kV/mm, which meets the design requirements. KeywordsMulti-circuit transmission line on same towerFinite element methodOptimization design