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Studies on new solutions in the field of high-voltage insulating materials are presented in this book. Most of these works concern liquid insulation, especially biodegradable ester fluids; however, in a few cases, gaseous and solid insulation are also considered. Both fundamental research as well as research related to industrial applications are described. In addition, experimental techniques aimed at possibly finding new ways of analysing the experimental data are proposed to test dielectrics.

Technology: general issues --- optical radiation --- electrical discharges --- insulating liquids --- energy distribution --- transformer --- oil–paper insulation --- moisture --- drying --- synthetic ester --- mineral oil --- natural ester --- dielectric liquid mixtures --- retrofilling of power transformers --- streaming electrification --- ECT --- insulation aging --- insulation diagnostics --- aramid paper --- cellulose --- dielectric materials --- insulation system --- thermal conductivity --- transformers --- partial discharge --- harmonic distortion --- non-uniform electric field --- discrete Fourier transform --- electric arc --- gas insulation --- arc welding --- optical method --- spectrophotometer --- electromagnetic radiation --- arc lamps --- dielectric polarization --- relaxation methods --- activation energy --- cellulose–aramid paper --- moisture insulation --- ageing effect --- power transformer insulation testing --- insulation liquid mixtures --- power transformers --- retrofilling --- rotating disc system --- synthetic esters --- liquid insulation --- DC high voltage --- composite insulator --- glass-reinforced epoxy core --- 3-point bending test --- mechanical strength --- micro-hardness --- naturel ester oil --- nanofluids --- zinc oxide --- AC breakdown voltage --- Weibull distribution --- normal distribution --- transformer winding --- deformation --- frequency response analysis (FRA) --- numerical index --- window width --- power transformer --- interpolation --- mathematical modeling --- n/a --- oil-paper insulation --- cellulose-aramid paper