The work proposes the application of neural networks with particle swarm optimisation (PSO) and genetic algorithms (GA) to compensate for missing data in classifying high voltage bushings. The classification is done using DGA data from 60966 bushings based on IEEEc57.104, IEC599 and IEEE production rates methods for oil impregnated paper (OIP) bushings. PSO and GA were compared in terms of accu...

Frequency Domain Spectroscopy (FDS) is widely used to estimate oil–paper insulation. The high moisture and long aging change the FDS characteristics of insulating oil–paper, so normalization processing required. Still, choice single activation energy needs further research. This paper studies characteristic insulation samples with different degrees improves traditional temperature correction me...

Fast and very fast transient overvoltages generally appear during switching operations within electrical substations. The oscillatory nature of such phenomena with frequencies that can reach several tens megahertz tends to degrade the lifetime high voltage equipment as bushings transformers, inducing partial discharges activity or breakdown insulation system. According case studies, are one mos...