在大型电力系统中存在有自生的甚低频系统振荡。
In large interconnected power system, there have been spontaneous system oscillations at very low frequencies.
甚低频电磁法(VLF - EM)，具有仪器轻便、方法简单、经济高效等优点。
The advantages of VLF-EM method are portable, simple, economic and efficient.
甚低频电磁法(VLF - EM)，具有仪器轻便、方法简单、经济高效等优点。
The advantages of VLF-EM method are portable, simple, economic and efficient.
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