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High-Temperature Material Applications for Liquid Immersed Transformers

Liquid immersed transformers will play a key role in distributing power throughout the grid to meet the expected future increase in global demand for energy. In this presentation, attendees will learn how liquid immersed transformers, designed with high-temperature materials, have been used to successfully address energy demand challenges.

Date: September 29, 2015
Time: 11 AM EDT (8 AM PDT / 5:00 PM CEST)
Duration: 1 hour
Presented by:


A recent headline in the magazine Transformers read: Electricity of Viet Nam (EVN) has spent nearly US$22.3 billion to build power plants and grids during the past five years under the national power development plan. The projects included 865 new transformer stations and transmission lines (Vietnam News). This is but one country investing in its grid infrastructure. DuPont, having played a central role in supporting the development of high-temperature transformers and associated standards, will be present with its portfolio of unique high-temperature products.

Today, state-of-the-art computer programs have extracted about as much cost as possible in pursuit of competitive designs for liquid immersed transformers while maintaining the highest global standards of quality and reliability. But conventional materials inherently limit size or weight reduction, and life extension is limited to lowering the winding temperature rise and correspondingly increasing transformer size and weight. High-temperature insulation offers a new avenue to explore the possibilities of matching an application with optimized cost and is now one of the few opportunities available for a true step-change in design strategy for life extension, increased capacity, or smaller size.

High-temperature design has been around for many years, but now global standards are in place and available to shape development in this area. This presentation will discuss some of the properties of various types of high-temperature insulation and where they fit best in the many different winding designs used by today's engineer. Examples and case histories will also be presented to illustrate some of the many successful applications for high-temperature insulation.

Key Takeaways

  • Learn about the performance of different Nomex® products in liquids
  • Discover which Nomex® products work best in various transformer winding designs
  • Learn about gas production at elevated temperatures
  • Understand how new high-temperature insulation is tested to verify the thermal class
  • Review case studies that demonstrate the benefits of high-temperature transformers


Rick Marek, Applications Research Associate, DuPont™ Nomex® Energy Solutions

DuPont Applications Research Associate Rick Marek is an expert in transformer and specialty power supply manufacturing. He is a life member of IEEE where he has been active in the Transformers Committee, various subcommittees, and numerous working groups since 1982. Marek has served as chairman of the high-temperature liquid immersed transformer standard C57.154 and the dry-type loading guide, C57.96. He is the current chairman of the harmonic loading guide, C57.110 and an addendum to the fiber optic sensor guide, IEEE 1538. He is also an IEC TC14 delegate for the U.S. Technical Advisory Group and was the convener of the high-temperature liquid immersed transformer standard IEC 60076-14. In addition, Marek is currently a member of the dry-type standard working group IEC 60076-11, the Liquid Loading Guide IEC 60076-7 and he is the reciprocal liaison between IEC TC112 and TC14.