Keynote topic: Streamer and Breakdown Phenomena of Dielectric Liquids
Abstract
Mineral oils, as a conventional dielectric liquid option, have been widely used in high voltage equipment, e.g. power transformers, for over a century. In the past decades, a variety of ‘new’ dielectric liquids including natural and synthetic ester liquids, gas-to-liquid (GTL) oils, biodegradable hydrocarbon liquids have emerged in the applications, and they all possess certain improved properties, e.g. biodegradability, fire safety, purity and so on. Knowledge of insulation design has been accumulated mainly based on the experience of using mineral oils, which may not be readily appliable for these new liquids. This seminar will introduce the fundamental streamer and breakdown mechanisms of dielectric liquids and will discuss the effects of impulse polarity, impulse waveform, electric field uniformity and liquid type on streamer and breakdown phenomena of dielectric liquids.
Biography
Qiang Liu is a Professor of High Voltage Engineering at the University of Manchester. Qiang obtained BSc and MSc degrees from Xi’an Jiaotong University (XJTU), China and a PhD degree from the University of Manchester, UK. Qiang is currently the Head of High Voltage Research Group in the Department of Electrical and Electronic Engineering. He is the convenor of CIGRE D1.01 Advisory Group on “Dielectric liquids and liquid impregnated insulation systems” and a member of several CIGRE A2/D1 working groups. He is also a senior member of IEEE and the secretary of IEEE Dielectrics and Electrical Insulation Society (DEIS). His research focuses on fundamentals of dielectric liquids and their engineering applications in power equipment and electrified transportation.
