Comparative analysis of the R15i sensor and a thermoformed piezoelectret transducer for partial discharge acoustic signal detection - Alves, Jéssica Fernandes; Palitó, Thamyres Tâmulla Cavalcante; Altafim, Ruy Alberto Pisani; Domingues, Cesar; Altafim, Ruy Alberto Corrêa (Electric Power Systems Research, 2025)