Abstract:In this paper, a trapezoidal micro-electromagnetic coil is designed and fabricated for online current monitoring of high-voltage transmission lines. Based on the magnetic field distribution characteristics around the transmission lines, finite element software is used to compare the induced electromotive force in square and trapezoidal coils under high-voltage magnetic fields. The influence of the trapezoidal coil"s slant angle on electromagnetic performance is simulated and analyzed, and the optimal slant angle range is determined. Furthermore, trapezoidal and square coils are manufactured using electro-hydrodynamic jet printing technology, and comparative experiments are conducted in high-voltage transmission line magnetic fields. Experimental results show that, with the same number of turns and area, the induced electromotive force of the trapezoidal coil is higher than that of the square coil. The trapezoidal coil exhibits the best sensing performance when the slant angle is around 60 °. This study provides theoretical and technical support for the design and fabrication of micro-coils and aids in guiding the application in high-voltage transmission line monitoring.