Dielectric Strength and Aging Performance of Polybutylene Terephthalate (PBT) under the Influence of Temperature and Humidity -- Laboratory Tests of a Composite Insulator Instrumented With Optical Fiber Sensors -- The Effect of Water Content on the Electrical Properties of Transformer Oil -- Materials based lifetime assessment of porcelain insulators -- On the Dielectrical, Electrical and Thermo-physical Properties of Magnetite Nanoparticle-Doped Synthetic Ester.

High voltage engineering is extremely important for the reliable design, safe manufacture and operation of electric devices, equipment and electric power systems. The 21st International Symposium on High Voltage Engineering, organized by the 90 years old Budapest School of High Voltage Engineering, provides an excellent forum to present results, advances and discussions among engineers, researchers and scientists, and share ideas, knowledge and expertise on high voltage engineering. The proceedings of the conference presents the state of the art technology of the field. The content is simultaneously aiming to help practicing engineers to be able to implement based on the papers and researchers to link and further develop ideas.