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中文摘要：
中性点接地的变压器有直流入侵时,铁心直流偏磁饱和,将出现变压器发热、噪声,且励磁电流谐波含量增大,使无功损耗增加。利用J-A磁滞回线理论,在Matlab环境中建立单相自耦变压器仿真模型对地磁感应电流（GIC）作用进行了仿真分析,得了较好结果。
英文摘要：
Once the neutral grounding of transformer is intruded by direct current,the core direct current bias will saturate.The transformers became heating and noise and excitation current harmonic content increased,which made reactive loss increased.Based on J-A Hysteresis theory,single-phase autotransformer model was established in MATLAB and the geomagnetic induced current（GIC） was simulation analyzed,by which better result was obtained.
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