This paper presents a series of experimental and numerical investigations into the dynamic performance of three phase enclosure type GIL conducting alternating currents. Details of experimental arrangements are introduced followed by descriptions of the vibration characteristics of the conductors acquired through accelerometer. The alternating current intensities have a frequency of 50 Hz and vary between 700–1500 A. Due to the alternation of electromagnetic forces under a relatively high frequency, the three conductors vibrate when the GIL is conducting currents. It is shown that the current intensity has clear impact on the vibration acceleration and amplitude of GIL conductors. It is also noticed that the location of insulators also influence the vibration characteristics of GIL significantly. In addition to the experimental investigations, numerical modelings are also introduced to simulate the dynamic response of GIL conductors. The numerical models show good validation against the experiment results and provide detailed insights in the dynamic performance of GIL conductors. The findings of this study allow further investigations into the relationship between vibration characteristics of GIL and its general performance.