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变压器智能组件在雷电冲击试验考核时，其电源模块、通讯模块等频繁发生故障，迫切需要掌握雷电冲击试验过程的空间磁场特性，以有效指导电磁干扰防护。通过试验测量获得了雷电冲击试验回路的电流波形，然后基于电磁场的三维有限差分(finite-difference time-domain，FDTD)算法进行空间磁场计算，最后由电磁兼容抗扰度试验标准评估雷电冲击试验时智能组件的受干扰程度。计算得到100%全波试验时，在距变压器1~6m典型智能组件位置处的磁场幅值均小于100A/m；而100%截波试验时可达160A/m。通过比较磁场变化率，可以发现，由5级脉冲磁场和5级阻尼振荡磁场抗扰度试验来考核智能组件承受雷电全波试验骚扰的能力是严格的，但考核雷电截波试验骚扰则不够严格。“,”The power supply module and communication module of transformer intelligent components frequently malfunction in lightning impulse test. It is urgent to get the characteristics of space magnetic field in lightning impulse test in order to guide the electromagnetic interference protection. This paper got the loop current waveform of lightning impulse test through measurement, calculated the space magnetic field based on finite-difference time-domain method and accessed the degree of interference on EMC immunity test standard at last. The calculated magnetic field amplitude is less than 100A/m at typical intelligent component location 1~6 m away from the transformer when 100% full-wave impulse test, but it can achieve 160 A/m when 100% chopped-wave impulse test. By comparing change rate of magnetic field, it can be found that class 5 pulse magnetic field immunity test and class 5 damped oscillatory magnetic field immunity test are strict enough for testing the ability of intelligent component to suffer from interference of lightning full-wave impulse test, but not enough for testing the ability to suffer from interference of lightning chopped-wave impulse test.