LCOE uses state-of-the art technologies to perform on-line PD measurements. Depending on the particular characteristics of the circuit, different type of PD sensors (HF, VHF and UHF) as well as different filtering technologies (measuring frequency band selection, wavelet filter, etc.) are used to differentiate the electrical noise from the PD signals, different PD location techniques (reflectometry, GPS, etc.), and different ways for identifying the detected PD sources with the type of fault or cause that origins the PD signals. LCOE offers either periodical or continuous insulation monitoring services, by means of PD measurements on electrical grids, which allows analyzing the time evolution of PD patterns and evaluate its critical nature.