Localization of Partial Discharges and Dielectric Disturbances During Factory Acceptance Testing of Power Transformers Using Fiber Optic Acoustic Emission Sensing

During factory acceptance testing of large power transformers, occasionally dielectric failures may occur. To repair the failure, its location must be found. In recent years the locations of breakdown, due to Lightning Impulse, LI, and Switching Impulse, SI, have been successfully found using acoustic emission sensors. This paper discusses 2 different cases, one LI and one