Aiming at the problem of low efficiency and high safety risk in high voltage overhead line electricity testing work, this paper proposes an anti-interference, non-contact electroscope carried by an unmanned aerial vehicle (UAV). Using COMSOL Multiphysics software, we established single-circuit and double-circuit lines three-dimensional simulation models of non-contact electricity testing sensor under the safe operating distance of overhead transmission lines, used parallel capacitive electrode plates to sense the voltage of transmission lines, and obtained the induced voltage within the range of −10 m to 10 m from the plane of transmission lines. According to the need for electricity testing against signal interference other than industrial frequency, a phase-sensitive detector circuit based on dual phase-locked amplifiers is proposed to extract the voltage between electrode plates. Simulation and experimental results show that the electroscope can efficiently and safely determine the charged state of high-voltage lines, providing a new power system operation and maintenance solution.
Huang et al. (Wed,) studied this question.