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Selecting Casting Resins for Instrument Transformers: Flexible vs. Rigid Materials

The variety of instrument transformer applications require a range of properties to meet the performance demands of each end use. This presentation will review various product offerings to achieve the requirements of these different market applications.

Originally presented: April 13, 2021
Duration: 1 hour
Presented by:


Instrument transformers comprise a class of electrical energy management devices designed to insulate sensitive instrumentation such as meters, relays and control circuits from high voltages and currents, and to step currents to levels compatible with the instrument.

Instrument transformers are vital components in the power distribution industry and assist in monitoring, control, operation, and protection of the systems in which they are installed.

Many different resin chemistries have been used in cast transformer applications over decades of market developments. We will discuss the value drivers that help in the process of selecting the correct chemistry and finished formulation to meet the needs of a specific application based on the capabilities of the manufacturer and the expectations of the end user.

The chemistry paired with the application process can deliver improved performance measured through electrical and mechanical testing which will lead to longer product life and increased value to the end user. These cost vs value relationships can be demonstrated as part of an innovation cycle that focuses on product life performance improvement while creating better efficiencies.

Key Takeaways

  • Understand the criteria of resin selection
  • Differentiate resin chemistry
  • Improve transformer life performance
  • Evaluate cost vs. value relationships
  • Examine application, chemistry, and electrical & mechanical property differences


Ronald Goetter, Director of Technology Development, ELANTAS PDG, Inc.

Goetter has a master's of science degree in organic chemistry and has spent over 30 years in the chemical industry in various product and technology development positions. In his current role as the director of technology development for ELANTAS PDG, he is responsible for the technical activities at the Olean, New York and St. Louis locations, and works closely with the commercial group to develop the next generation of performance through products and applications. He has presented topics of technical interest at various conferences and industry tradeshows and is the co-author of two patents.

Mark Winkeler, Manager of Application Technology, ELANTAS PDG, Inc.

Winkeler is the manager of application technology at ELANTAS PDG, Inc., formerly the P.D. George Company. He has been with the company since 1982 and is currently responsible for the application technology group. The group's activities include customer support, agency testing and prototype processing. Mark works closely with R&D and sales teams to develop innovations to assist the electrical industry. Winkeler received a bachelor's of science in physics from Southern Illinois University in 1981 and an MBA in 2006. He serves as vice-chairman of ASTM committee D9 and is a member UL STP for UL1446.He has authored papers on various electrical insulation topics that have been presented at the EEIC and coil winding conferences and serves on the EIC board of governors.