Professor Ruy Alberto Pisani Altafim and Professor Ruy Alberto Corrêa Altafim, presenting their collaborative work at the 16th International Symposium on Electrets in Leuven-Belgium. The work is part of Dr. Daniel Rodrigo Falconi Ph.D. thesis, where it was presented a new concept for measuring high voltages discharges in power distribution lines using electret films as a base for sensors.