Fast analysis based on electromagnetic topology using hybrid numerical and BLT method for large scatterer

Abstract

This paper proposes a fast and accurate analysis method based on electromagnetic topology (EMT) using the virtual tube for a large scatterer for the first time. A large scattered gas-insulated switchgear (GIS) has a structure similar to a waveguide, and all modes corresponding to the effective frequency bands must be considered for partial discharges caused by internal defects and non-ideal pulses induced from the outside. In order to apply the EMT methodology in the large scatterer, these were subdivided, and the propagation supermatrix and scattering supermatrix are defined by considering the voltage order according to the mode and each subdivision model at the subdivided point. By applying the BLT equation to these super matrices, the voltage response at all subdivision points can be obtained. In addition, the proposed EMT method using a virtual tube can reduce the complexity of the supermatrix that occurs when the structure of a large scatterer is subdivided, and unlike the general electromagnetic topology method, it enables model subdivision at discontinuities. Accuracy was verified by comparing the frequency response of the entire model, which is a conventional method for analyzing electromagnetic wave propagation in a waveguide, and the frequency response to which the proposed methodology was applied, and it was also verified experimentally. Therefore, it was possible to further reduce analysis time and resources by increasing the number of subdivision models at discontinuous points using a virtual tube while applying the electromagnetic topology method to the large scattered GIS for the first time.