IEEE DEIS Monthly Webinar on:
Dielectric performance of insulating liquids for transformers – a CIGRE study
Presented by Lars E. Lundgaard
Chief Research Scientist at SINTEF, Norway
April 10, 2025, at 11:00 AM CET
Abstract: The webinar presents an excerpt of CIGRE Technical Brochure 856, a joint study that addresses the dielectric performance of the insulating liquids used in transformers.
Dielectric liquids, in combination with solids, have been used for insulation systems of power transformers for more than a century. While mineral oils have dominated the market, new liquids with different molecular structures are now in common use. Experience shows that the dielectric performance of these liquids varies. The study covers a short review of design and testing of transformers insulation and a description of the most common liquids. The many modes of streamer breakdown and the impact if electric field, chemistry, pressure etc documented in experiments is shown, and features and theories that attempts to modelling this described. Test methods for revealing functional properties of dielectric liquids are discussed and principles used for insulation design is covered.
Bio: Lars E. Lundgaard (IEEE senior member) received his master’s degree in electrical engineering in 1976 at the Norwegian Institute of Technology. He is working as a Chief Scientist at SINTEF Energy Research, where his main interests are in electric insulation systems. He is an active member in CIGRE in the fields of materials and transformers, and has written about 70 journal and 100 conference papers.
Registration is required: https://ieeemeetings.webex.com/weblink/register/rc11a505de0d1a9c6bcc5963d70821936