Transformer Magnetization under the Influence of Geomagnetically Induced Currents

地磁感应电流(GIC)会使变压器铁心饱和，导致变压器杂散磁通发热。在1989年3月的K-9太阳磁扰期间发生了许多这样的事件。变压器内部杂散磁通分布复杂，影响因素较多。对GIC下变压器磁通分布进行了系统的三维分析。将计算变压器内所有地方的磁场。将对不同变压器设计、铁心结构的杂散磁通模式以及涡流进行分析和比较。这项研究的目的是揭示在GIC影响下变压器的基本磁化机理，评估潜在的杂散磁通加热地质脆弱的变压器单元的可能性。研究结果将有助于公用事业公司证明对高风险单位采取缓解行动的必要性是合理的。制造商可以利用研究结果来审查他们的设计策略，并引入可能的设计考虑因素，以减少未来的GIC效应。

Geomagnetically induced currents (GIC) could saturate a transformer core and result in transformer stray flux heating. Many such incidents have occurred during the March 1989 K-9 solar magnetic disturbance. Stray flux distribution within a transformer is complicated and involves many factors. A systematic three dimensional analysis of transformer flux distribution under GIC is proposed. Magnetic fields everywhere inside a transformer will be calculated. Stray flux patterns as well as eddy currents for different transformer designs, core configurations will be analyzed and compared. The objectives of this study are to reveal the fundamental transformer magnetization mechanism under the influence of GIC, to assess potential stray flux heating possibilities of geologically vulnerable transformer units. The research findings will help utilities to justify the needs for mitigation actions on high risk units. Manufacturers may use the research results to review their design strategies and introduce possible design considerations to reduce GIC effects in the future.