Overview and details of the sessions of this conference. Please select a date or location to show only sessions at that day or location. Please select a single session for detailed view (with abstracts and downloads if available).
Emerging Technologies in Dielectrics and Insulation Materials
Time:
Wednesday, 11/June/2025:
10:30am - 12:00pm
Session Chair: Mark Winkeler, ELANTAS PDG, Inc., United States of America
Location:Egret
Session Topics:
New Materials & Nanodielectrics (ET), Thermal and Dielectric performance (ET), Principles, Tools and best practices for insulation reliability in HV equipment. (ET)
Presentations
10:30am - 11:00am
Optimizing Permittivity Grading in Power Semiconductor Modules to Reduce Electric Field Stress at the Triple Junction
M. Kurimoto, S. Jayaram
University of Waterloo, Canada
One of the major concerns in high-voltage power semiconductor modules is the high electric field stress at the edge of the metallization, where the substrate, encapsulation material, and electrode meet; commonly referred to as the triple junction. If this stress is not controlled, partial discharge may occur, eventually leading to insulation failure. To mitigate this issue, electric field grading techniques, such as the use of permittivity-graded materials in encapsulation, have been investigated. However, the optimal distribution of permittivity remains unclear. This study explores the effective distribution of relative permittivity (𝜀r) in permittivity-graded materials for reducing electric field stress at the triple junction. By comparing the stress-reducing effects of four different types of permittivity distributions, the study aims to identify and discuss the most effective approach.
11:00am - 11:30am
Manufacturing of Experimental Coils using Sustain Epoxy, Resin Rich Mica Tape
R. Draper1, S. McCabe2, I. Bergmann3, B. Six3, W. Grubelnik3, T. Henry1, M. Ranch1
1Andritz Hydro, Canada; 2The Aev Group, UK; 3Isovolta, Austria
Modern insulation systems for Hydro Generator Stators use mica-based insulations that are made with either a Vacuum Pressure Impregnation system or a system where resin is preloaded into the mica tapes using a Resin Rich insulation. Traditionally, these systems are based on binding the mica layers together with epoxy that is based on petroleum.
With advances in bio-based materials, there are now sustainable versions of epoxies that are available. Recent work has shown that some of the epoxies that are commonly used in our industry are now available in sustainable form.
Within Andritz, there is a CEO driven initiative to improve our ESG (Environmental, Social, and Governance) performance. Andritz recently has driven work such as removal of chemicals that have Carcinogenic, Mutagenic and Reproductive risks for workers and have invested heavily in businesses and technologies to improve environmental impacts for our customers. In our Hydro Power business more recently, we have teamed up with Isovolta to explore
