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High temperature epoxy resin bushings for windfarm transformers

Turbine designs continue to grow in power size, while reducing the space provided for the transformer in the nacelle area. This presents several challenges in transformer bushing designs, one of which is the considerable increase in the ambient temperature. As a result, H-J has developed a new high-temperature epoxy used on transformer bushings to help transformer manufacturers match their high-temperature insulation systems.

This new high-temperature epoxy is suitable for continuous use at 155°C, thus allowing users to pack more power into smaller footprints by running the systems hotter. H-J currently produces bushings with proprietary epoxy blends for 105, 120, and 155°C maximum operating temperatures.

The following paper created by H-J’s Engineering team would provide details about this very important topic and we are pleased to share with you.


Electrical insulating component design has become increasingly challenging due to rapidly changing requirements in power industry applications. Cost reduction and increased performance requirements present new challenges for traditional insulation solutions. Modern insulating component designs must push the limits of dielectric performance while maximizing mechanical strength characteristics in a host of environments. In particular, the recent advancements in the use, size and scale of renewable energies such as solar and wind power necessitate enhanced performance epoxy insulating materials capable of delivering high dielectric and mechanical strength in high temperature environments. This paper summarizes a brief history and current state of epoxy component insulation with commentary on advancements made for applications requiring enhanced material performance for high temperature applications.

Index Terms: Epoxy, High Temperature, Insulator, Bushing, Power Transformer, Switchgear.

To read the full content,
please download the PDF below.