Acoustic inspection of distribution networks is seen as one of the main tools for identifying problems in electrical equipment at an early stage. As is often the case with predictive methods, the analysis of detected phenomena can reveal valuable information about the integrity of the equipment. Therefore, this article aims to evaluate the phenomena detected in a distribution network, with a primary focus on the occurrence of partial discharges identified through ultrasonic inspection. A digital ultrasonic testing device was used to detect acoustic signals emitted from an overhead distribution system, thereby gaining more experience in electrical equipment inspection and in the identification of partial discharges.