We investigated propagation properties of acoustic waves in the frequency range from 10 kHz to 200 kHz using two acoustic emission (AE) sensors to diagnose the insulation performance of GIS. From the experimental results, we estimated that attenuation and velocity of the acoustic waves propagating in SF6, gas and GIS tank wall. Taking these results into consideration, we tried to identify the location of partial discharge (PD) source in the model GIS tank using the difference in the measured time between the PD occurrence and the first wave arrival at two different frequency components of the acoustic signal by utilizing the dispersive property of the velocity of the waves. Consequently, we could identify the location of PD with high accuracy.
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