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2005 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Identification of Incipient Discharges in Gas Insulated System using Acoustic Emission Technique R. Sarathi, Vishal Dubey and Y.G. Sriivasat Department of Electrical Engineering, Indian Institute of Technology Madras, Chennai-600 036, India. tDepartment of Mechanical Engineering, Indian Institute ofTechnology Madras, Chennai-600 036, India. Abstract: The reliability of the SF6 gas filled GIS is GIS is scanty. Having known all this, in the present adversely affected by the presence of foreign particles in work, a methodical experimental study was formulated the insulation structure, which initiates partial to understand the partial discharge activity under discharges leading to catastrophic failure of insulation composite voltage formed by AC and DC voltages, in structure. The literature on partial discharge activity GIS using Acoustic Emission (AE)technique. study under the composite voltages in GIS is scanty. Having known all this, in the present work, a Experimental methodical experimental study was formulated to understand the partial discharge activity under The experimental setup used for the measurement of composite voltage formed by AC and DC voltages, in acoustic signal generated due to partial discharges in the GIS using Acoustic Emission (AE) technique. The gas insulated system, under the composite voltage Acoustic emission signal parameters Viz. amplitude, formed by AC and DC voltages is shown in Fig. 1. rise time of the pulse, duration of the AE signal, counts and the energy content of the AE signal were analysed (i) Test Apparatus and the characteristics of discharges under different voltage profiles were explained.