Generator Insulation

Nomex® for Generator Insulation Helps Extend Equipment Life

From small generators used in wind turbines to very large turbo generators, the use of DuPont™ Nomex® brand papers and Nomex® based laminates for generator insulation helps improve reliability.
Generator insulation is a small but critical component that plays a major role in determining the reliability and service life of a generator. Choosing Nomex® as generator insulation helps increase reliability, prevent premature failure and extend generator service life.
The outstanding thermal performance, excellent dielectric strength and mechanical toughness of Nomex® are the reasons why it is an ideal choice as generator insulation for all sizes of generators used in a broad range of applications.

Exceptional Thermal Protection
The use of Nomex® for generator insulation can help prevent premature failure and equipment downtime. That’s because Nomex® does not shrink, embrittle, soften or melt during short-term exposure to temperatures as high as 300°C, and because it maintains good insulating properties continuously at 220°C for 10 years.

Excellent Dielectric Strength
Nomex® insulation features excellent electrical properties, even when exposed to environmental conditions such as high humidity.

Superior Mechanical Toughness
The excellent mechanical strength and resilience of Nomex® insulation help extend the service life of generators subjected to harsh operating conditions, such as the abrasion caused by thermal expansion and centrifugal forces in standby gas-turbine generators.

Typical Applications in Generators
Nomex® papers and Nomex® based laminates are used in motors as:
• Slot insulation
• Wedges and midsticks
• Phase insulation
• Conductor insulation
• Coil separators
• OCT tape
• Tubing
• Pole insulation
• Turn insulation
• Main wall insulation

Typical Generator Equipment
Nomex® papers and Nomex® based laminates are used in virtually all types of generators, including:

AC Generators
• Turbo generators
• Hydro generators
• Low voltage generators
• High voltage generators
• Wind generators

DuPont products & services

Nomex® 800 Series

Nomex® 410, an original benchmark product, is widely used for a majority of electrical equipment applications and is considered our gold standard based on its more than 50 years of proven performance. It anchors the Nomex® 400 Series.

Nomex® 410 and the 400 Series

DuPont works with highly qualified laminators who produce high-quality laminate insulation products based on Nomex® paper to address a broad range of performance requirements. Nomex® is the critical component that helps enable these laminates to perform.

Laminates made with Nomex®

Information & ideas

Nomex® Product Line Overview

Nomex® paper properties

Seeing the excellent electrical, mechanical and thermal properties of Nomex® 410 makes it easy to understand why this insulation paper is widely used in a majority of electrical equipment applications.

Properties of Nomex® 410

Case studies

ABB’s Rapid Recovery Transformer Initiative

ABB, partnering with the U.S. Department of Homeland Security (DHS), delivered three modular transformers from its St. Louis, Missouri facility to a Texas substation within 20 hours in an emergency drill. These transformers designed with DuPont™ Nomex® high-temperature insulation can be shipped and fully energized in less than a week.

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Industry segments:

Power Generation and Distribution

DuPont offers a wide range of high-performance products that help optimize the performance and extend the service life of power generation and distribution equipment.