Research on Voltage Reconstruction Method for Double-Circuit Lines Based on Spatial Electric Field Decoupling

As global energy demand grows, double-circuit Overhead transmission lines (OHTLs) have been widely adopted in modern high-voltage power systems due to their higher transmission efficiency and economic benefits. For these complex transmission systems, real-time voltage monitoring is crucial for operational safety, where non-contact measurement based on electric fields has become an important technical approach. However, the complex electric field coupling between OHTLs significantly affects measurement accuracy, particularly in drum-type tower structures where conductors are nearby. This paper proposes an electric field decoupling method based on a double-probe structure. By analyzing the characteristics of electric field sensors and tower structure features, a mathematical model between measurement points and conductor voltages is established, combined with correction coefficients to achieve accurate voltage measurement of individual conductors. Simulation results demonstrate that the proposed electric field decoupling method is effective for drum-type double-circuit transmission lines and has broad application prospects in voltage monitoring of doublecircuit OHTLs.