Abstract

The late-phase electromagnetic pulse (E3) of high-altitude nuclear explosions induces DC bias currents in power transformers via geomagnetically induced currents (GICs), threatening grid stability. Existing studies lack consensus on failure thresholds under HEMP E3 conditions. This paper addresses this gap by developing a multiphysics model of an SSZ10-40000/110 transformer exposed to simulated HEMP E3 environments. Our results demonstrate that DC currents exceeding 16.5A cause tank wall displacement (100 μm limit) and noise levels (>90 dB), with insulation breakdown occurring at 19A DC. These thresholds provide critical benchmarks for transformer protection strategies.

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2023journal301 Moved Permanently," <i>Modern Applied Physics</i>, Vol. 14, No. 1, 010101, 2023.<br><a href='http://dx.doi.org/<head><title>301 Moved Permanently'>doi:301 Moved Permanently

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Dr. Zhaomin Han

Dr. Jie-Qing Fan

Dr. Hanhan Hu

Dr. Rui Zhu

301 Moved Permanently