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This book is a collection of recent publications from researchers all over the globe in the broad area of high-voltage engineering. The presented research papers cover both experimental and simulation studies, with a focus on topics related to insulation monitoring using state-of-the-art sensors and advanced machine learning algorithms. Special attention was given in the Special Issue to partial discharge monitoring as one of the most important techniques in insulation condition assessment. Moreover, this Special Issue contains several articles which focus on different modeling techniques that help researchers to better evaluate the condition of insulation systems. Different power system assets are addressed in this book, including transformers, outdoor insulators, underground cables, and gas-insulated substations.

artificial neural network --- simulation --- high-frequency --- artificial flashover tests --- wide bandgap power modules --- tracking --- electrical field strength --- fast-rise square wave voltages --- FDTD simulation --- cable joint --- corona discharge --- feature selection --- post insulator --- earthing systems --- wind speed --- surface discharge --- oil/paper insulation --- oil-paper insulation --- high-magnitude currents and impulse polarity --- UFVM --- Tettex 9520 --- electrical tree --- flashover characteristics --- composite insulator --- partial discharge --- numerical modeling --- saline mechanism --- thermal parameters --- space charge density --- seasonal --- ion flow field --- denoising --- DDX 9121b --- temperature --- transformer asset management --- cavity discharge --- space/interface charge --- insulation health index --- heat transfer model --- leakage current --- machine learning --- partial discharges (PD) --- RF signal --- flashover --- high impulse conditions --- grounding electrodes --- generalized finite difference time domain --- curve fitting --- grounding --- plasma discharge --- outdoor insulators --- flashover dynamic model --- wavelet transform --- degradation --- thermal properties --- bipolar charge transport model --- UHF sensor --- cable --- random walk theory --- tracking test setup --- GIL --- pressure --- modelling --- non-uniform pollution between windward and leeward sides --- calibrator --- secondary arc --- polymeric insulation --- optical-UHF integrated detection --- shoreline --- dry band arcing --- photoelectric fusion pattern --- DDX 8003 --- XLPE --- silicone gel --- partial discharge modeling --- electric field analysis --- NSCT --- electrode’s geometry --- gas --- Comsol Multiphysics --- fast-impulses --- laying modes --- ageing --- cable ampacity --- residual resistance formulation --- finite element analysis --- thermal effect --- hydrophobicity --- soil resistivity --- charge simulation method --- short-circuit discharge --- dry band formation