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To ascertain flashover mechanism of the roof external insulation in high-speed airflow environment, breakdown characteristics and mechanisms of short needle-plate air gaps in high-speed airflow were investigated based on an artificial experimental wind-tunnel platform We obtained the breakdown characteristics of the air gaps in wind sand environment by studying the influences of sand mass concentration,...
In this paper, a modified FDTD method using a hybrid Cartesian-cylindrical coordinate system is presented for modeling long wires with a axial symmetry structure. The wires are described with FDTD equations in a cylindrical coordinate system, and the non-wire zone in a Cartesian coordinated system. A thin-wire model is employed to link these field equations, and a time-domain solution is available...
This paper presents overall design considerations of the high-voltage and high-frequency (HV-HF) transformer in dc/dc converter stages of solid state transformer (SST). SST is a new concept of an interface for direct connection between the distribution line and local customers which can be considered as another generation source as well from the local smart-grid point of view. Therefore, the size...
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