A large amount of contaminants are collected on the cardboard surface valve-side bushing outlet a converter transformer that has been operating for long period, and can cause performance oil–paper insulation to degrade. The analysis their energy spectrum shown these contain free carbon. To investigate causes formation carbon traces, authors this study analyze law growth insulating paper in pres...

Carbon microsphere was successfully synthesized from waste office paper via hydrothermal method and high temperature treatment in nitrogen atmosphere. The process of carbon synthesis fiber using concentrated sulfuric acid studied, the influence H2SO4 concentration reaction time on hydrolysis considered. To investigate mechanism conversion to microsphere, Fourier transform infrared spectrometry ...