Electric Field Distribution of AC Transmission Lines Considering Vertical Sag
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Abstract
In order to study the actual ground electric field distribution under the AC transmission line, the influence of the height of the conductor to the ground on the electric charge and the electric field was analyzed. The results show that: The influence of the height of the conductor to the ground has little effect on the electric charge; The influence of the height of the conductor to the ground electric field is very large under the condition that the charge quantity is unchanged. Therefore, under the assumption that the height has no influence on the charge of the conductor, considering the arc shape of the conductor, the actual electric field under AC transmission line was solved by the differential vector superposition method and the electric field distribution under UHV AC transmission line was taken an example for the calculation and verification. The analysis results show that the high field range below the line only exists near the middle span and the electric field intensity decreases rapidly with the distance away from the midspan which is very different with the ground electric field distribution calculated by the minimum height. The research results have important guiding significance for the judgment of the house demolition.
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