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电磁环网问题在现代电网中得到了很大缓解，因此需被重新审视。基于双端电磁环网的网络方程，用补偿法求解变动网络，形成了N?1静态安全分析模型，给出了N?1静态安全的判断依据。研究表明，双端电磁环网的 N?1静态安全与转移比、通道占用比和充裕度3个因素密切相关。由于现代电网在这3个因素上容易满足N?1静态安全判据，因此双端电磁环网不一定是薄弱的电网结构。“,”The problem of electromagnetic loop of power network (EMLPN) has been, to a large extent, alleviated in modern power grid, and hence needs to be reexamined. Based on the network equation of the two-terminal EMLPN, the N?1 static security model was formed by utilizing the compensation method for solving changing network, and consequently the N?1 static security criterion was given. Research shows that the N?1 static security of two-terminal EMLPN is closely related to three factors which refer to the transfer ratio, the path occupancy ratio and the adequacy. Since modern power grid can satisfy the N?1 static security criterion on these three factors easily, the two-terminal EMLPN is not necessarily a weak grid structure.