Calculation Method for Voltage Distribution of Dry Hollow Series Reactor Under Lightning Impulse

The complex topology of dry-type, hollow, high-voltage reactors leads to significant inaccuracies in calculating interlayer voltage distribution using traditional equivalent models during lightning impulse testing. In this study, the finite-element method (FEM) was employed in calculating the inductance and capacitance parameters of the reactor using the winding layers as subdivision units. The improved equivalent circuit model incorporates mutual capacitance between non-adjacent layers. Through a comparison of simulation and experimental results, the proposed improved equivalent circuit model achieves an accurate simulation of the reactor’s voltage distribution. This research contributes to the insulation design of the reactor.