We observed current pulse waveforms of partial discharge (PD) in 275kV full scale 168m length gas insulated transmission line (GIL). We also investigated voltage phase dependency and frequency characteristics of electromagnetic wave emitted from PD. From these results, we discussed mutual relationship between PD current waveform and emitted electromagnetic wave characteristics. Furthermore, we discussed the propagation characteristics of PD signal in long GIL.
In this paper, we described the generation, propagation and detection characteristics of PD signal in GIL and finally, we could estimate the attenuation rate of the PD signal in long GIL.
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