In this study, we attempted to detect partial discharge occurring between motor winding using the pulsed electroacoustic method. In recent years, our research group has been conducting space charge distribution measurements using a voltage application method via a spatial gap for the measurement samples. To verify the detection of discharge using this method, we conducted space charge distribution measurements under atmospheric pressure and vacuum environments. As a result, charge drift due to discharge was not detected under vacuum environment, whereas it occurred under atmospheric pressure environment, and the discharge initial voltage roughly corresponded to Paschen’s law. Therefore, this study has revealed the possibility of detecting discharge using the PEA method.