强电磁脉冲（high-altitude electromagnetic pulse，HEMP）的E1阶段场强高、上升时间快、持续时间短，通过变电站内部控制线缆耦合的能量对末端智能化设备造成损伤，因此对变电站内部控制线缆的HEMP耦合响应特性分析显得尤为重要。通过对典型变电站实际线缆工况开展调研，仿真研究了HEMP环境下站内开关量和模拟量传输线缆的末端耦合响应水平。当屏蔽层不接地时，线缆末端会感应到大约70 kV的高电压，芯线接地时短路电流为4 A左右，屏蔽层的接地电流幅值大约为60 A。最后搭建了双锥-线栅天线作为水平极化HEMP模拟器对控制线缆进行了现场试验与仿真结果进行对比，验证了仿真方法的有效性。

The E1 phase of the high-altitude electromagnetic pulse （HEMP） has a high field strength, a fast rise time, and a short duration. It will damage the end of the intelligent equipment through the substation internal control cable coupling. Therefore, it is of particular importance to analyze the HEMP coupling response characteristics of the substation internal control cable. Through conducting research on the actual cable conditions of typical substations, the end coupling response level of switching and analog transmission cables in a substation under HEMP environment are simulated and investigated. The study reveals that when the shield is not grounded, the end of the cable induces a high voltage of approximately 70 kV. Additionally, when the core wire is grounded, the short-circuit current is approximately 4 A. The amplitude of the shield's grounding current is approximately 60 A. Finally, a biconical-linear-grid antenna is constructed as a horizontally polarised HEMP simulator. The control cable is tested in the field and compared with the simulation results to verify the validity of the simulation method.