Kornhuber, Stefan

Professor, University of Applied Sciences Zittau/Görltiz, Germany

Kornhuber, Stefan

Professor, University of Applied Sciences Zittau/Görltiz, Germany

Biography

Evaluation of Hydrophobicity Transfer & Retention: State-of-the-Art & Future Outlook

Dr. Kornhuber received his Electrical Engineering Degree and later his Doctorate from Graz University of Technology with main research on temperature measurement and uprating of OHTLs. Until 2006, he worked at the Test Institute for High Voltage Engineering in Graz doing testing, simulation and investigation of stresses of transients. He later joined Lemke Diagnostics with responsibility for production, development and sales and then ABB Power Transformers as Head of Condition Management. In 2014, he was awarded Professorship in High Voltage and Theoretical Electrical Engineering. His research topics are electrical interfaces of polymeric materials as well as diagnostic test and measuring methods. He is Convenor of CIGRE D1.58 and IEC TC 112 WG3

Functionality and service life of composite insulators depends largely on surface and/or interface ageing of the polymeric housing. Hydrophobicity and sealing of the rod by the silicone material must be guaranteed over the insulator’s entire life cycle since, if lost, leakage currents can flow through the moistened pollution layer. Understanding hydrophobicity behaviour as well as the processes that can lead to its reduction and recovery is therefore crucial to select the right material for an insulator. Hydrophobicity transfer is already included in IEC TR 62039 and results of multi-stress testing to investigate its retention and recovery have been summarized within CIGRE. This presentation will provide an overview of these test methods and results

Sessions: