High temperature operating life (HTOL) testing was performed on embedded planar capacitors (with epoxyBaTiO3 composite dielectric) by subjecting these devices to highly accelerated temperature and voltage aging conditions. The objective of HTOL testing was to precipitate avalanche breakdown failures as a result of defects in the composite dielectric. These defects include porosity, voids, and a...

This paper gives an overview of three topics related to sound insulation in buildings. The first project included laboratory and field measurements of sound insulation against aircraft noise. As well as various technical papers, the project produced software to help in the design of adequate sound insulation. In a second project, re-analysis of survey results allowed the development of a ration...

Online methods for stator insulation monitoring have been investigated with increasing interest in the last 15 years. These rely on high-frequency behavior of electric machine. In converter-fed machines, is visible through current ringings occurring during switching commutations power electronics. As lifetime machines can several decades, a faster way to evaluate accelerated aging tests. This w...

Covalently crosslinked protein networks produced from whey nanofibrils (PNFs) are demonstrated to be sustainable high-performance foams that show chemical resistance and mechanical strength, stiffness, toughness on harsh aging at 150 °C. The aged able retain their properties 180 °C for as long 24 h, far exceeding the of most classical petroleum-based thermoplastics. further developed into soft ...

This paper has the purpose to investigate HVDC insulation design considering real operating conditions, when DC steady-state is affected by frequent voltage transients or load variations that may be present during all life. Electrical field distribution in insulation, and defects, change significantly from vary with time, which can cause partial discharge activity often not been properly accoun...

Water can be an irritant to a power transformer, as it is recognized major hazard the operation of transformers. The water content transformer insulation system comprises in oil and cellulose paper. increase leads reduced breakdown voltage, accelerated aging oil–paper system, possibility producing bubbles at high temperatures. Therefore, various techniques have been applied measure both paper i...