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In power transformers, locating the partial discharge (PD) source is as   important as identifying it. Acoustic Emission (AE) sensing offers a good   solution for both PD detection and PD source location identification. In   this paper the principle of the AE technique, along with in-situ findings of   the online acoustic emission signals captured from partial discharges on a   number of Generator Transformers (GT), is discussed. Of the two cases   discussed, the first deals with Acoustic Emission Partial Discharge (AEPD)   tests on two identical transformers, and the second deals with the AEPD   measurement of a transformer carried out on different occasions (years).   These transformers are from a hydropower station and a thermal power station   in India. Tests conducted in identical transformers give the provision for   comparing AE signal amplitudes from the two transformers. These case studies   also help in comprehending the efficacy of integrating Dissolved Gas is   (DGA) data with AEPD test results in detecting and locating the PD source

Acoustic emission partial discharge detection technique applied to fault diagnosis: Case studies of generator transformers