In an effort to provide a more cost effective cooling duct and barrier insulation for transformers, Franklin has developed a special corrugated insulation. Nomex®, Vulcanized Franklin FibreTM and other suitable materials are now available.

When Franklin square, rectangular or sinusoidal insulation in special corrugated form are used in transformer winding, it provides convenience and labor savings. Many small to large sizes are produced for instrument toroid coils through large power and distribution transformers.

Our special roll and sheet insulation material provides additional insulation in winding and is compatible with common resins and varnish systems. Nomex® has UL component recognition #E34739A.

Because of its unique square or sinusoidal configuration, transformer design can be more standardized, allowing uniformity in winding and construction while providing cost effectiveness and flexibility for transformer engineers.

Nomex® and Vulcanized Franklin Fibre are resilient materials able to withstand the flexing of transformer shorts without coming loose or falling out. Franklin corrugated insulation has minimal mass yet high strength and does not resonate. Smaller end fill sizes are convenient for packing out or end filling a coil winding.

The strong and efficient design available through the use of Franklin corrugated insulation from Nomex® and Vulcanized Franklin FibreTM provides for increased cooling air flow down to the sources of heat. Greatly improved resin/potting impregnation is also facilitated. This allows for better total insulation design and/or cooling for increased core and coil efficiency.

Many transformer engineers firmly believe that only a rigid barrier and cooling duct design can survive the various types of overload, shorts, and surge faults commonly experienced. In such operating cases we believe a combination design of corrugation insulation with supplemental sticks be utilized. Such a design would use fewer sticks in more precise definite locations and provide more open area for cooling."
from "Advantages of Corrugated Transformer Insulation," Paper presented at the Transformer Insulation Technical session of the EEIC/ICWA Chicago Expo, October 4-7, 1993.

Franklin Corner Insulation for Toroidal Coils and Transformers
Patent applied for
For several years we have been developing a corner insulation for toroidal coils. This insulation has been designed for both inside and outside diameter corners for coils in the 3" to 20" or larger diameter range. Additional designs for other size ranges may be available in the future. The initial design is Franklin T-COR #6-320 insulation.

This is available in both 120°C Vulcanized Franklin FibreTM insulation as well as 220° Nomex®. The corner insulation can be used to protect and insulate fine windings from the sharp corners or toroidal cores and also be used as an interlayer corner insulation. It can also provide some barrier-insulation between primary and secondary windings.

Nomex® is a registered trademark of E.I. DuPont de Nemours and Company
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Benefits of Corrugated Transformer Insulation

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