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Technical Library Documents

Technical Library Documents

Webinars

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Tune in & listen to one of the authors, Solomon Chiang, who chairs the ANSI/NEMA Industrial Laminate Advisory Technical Committee, and hear him talk about what’s new and the critical updates. Not only are we the insulation experts, but we helped write the standard. Solomon is also The Gund Company’s Director of Corporate Research and Development.

This new edition covers the manufacture, testing, and performance of laminated thermosetting products in the form of sheets, rods, and tubes. It also includes a new format that consolidates the requirements for the physical and electrical properties of the individual NEMA Grades. It was developed by the NEMA Insulating Material Section and is published as an American National Standard. The new edition carries the tradition of adding new material grades to reflect the current and future needs of the industry. It also includes SI units (International System) for international audiences, and compares to other International Standards. The new edition clarifies potential ambiguities in the previous version to make it more user-friendly.

 

This webinar will provide those new to composites with an introduction to these engineered materials. Learn about basic composite construction, the design, fabrication, and production of composites, mechanical and thermal properties, and industrial applications. The webinar will also cover composite material combinations and the advantages of different composite manufacturing techniques.

 

Demanding power supply and battery applications require polymer solutions to aid in efficient design and cost-reduction exercises without sacrificing performance. In this on-demand webinar, learn how Polypropylene delivers an effective solution for demanding, cost-sensitive mass production for switchgear, electronics, and the e-mobility industry.

 

As the world seeks to improve the efficiency of motors and generators, manufacturers must look for all options to enhance designs. One way this can be achieved is by utilizing magnetic wedges in their stator designs. In this webinar, we will review the products’ materials, applications, and proper use. We will also discuss common failures and what causes these in applications using magnetic wedges. Webinar topics will include:: Magnetic wedges 101 Theory of their application in Motors and Generators Technical Data comparison of the materials used Address concerns over the use of magnetic wedges Proper use and installation Reducing field failures About the Presenters: Steve Ulm Steve has been the Director of Rotational equipment for The Gund Company for the last three years. Before TGC, Steve worked with electrical industry companies like Eaton, Bussmann, Littelfuse, and others in engineering and product management roles. Steve has a bachelor’s degree in Electrical Engineering from Purdue and earned his MBA from Northern Illinois. Victoria Villa As an Application Engineer, Victoria is a recent addition to the Rotational Equipment team. Before The Gund Company, Victoria supported engineers and architects in backup power generation design for commercial, higher education, and healthcare applications in a sales application engineering role. Victoria has a bachelor’s degree in Mechanical Engineering from Texas A&M University.

 

Tune-In to our on-demand webinar to hear our Director of Engineering, Solomon Chiang, explains how to determine the many ways to evaluate the long-term thermal performance of materials. Dr. Chiang will discuss how to navigate the minefields of thermal endurance testing. He will also dive deeper into Relative Temperature Index and Thermal Classes.

 

Proper material selection is critical to success when designing new oil and gas tools. Since this industry continues to utilize high-performance composite materials in frac plugs, casing tools, and other components, it is imperative to understand the advantages and limitations to optimize the design while minimizing cost.

 

Mechanical properties of materials under various environments and stress conditions are as important as electrical properties for product performance and reliability. For Oil and Gas, Transit, Medical, Space, and Aerospace Products, mechanical properties are often the most crucial consideration. However, material standard requirements are meaningless without standardized test methods.

Technical Papers

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Dielectric Strength is a critical property for any material with a primary function as an electrical insulator. In simple terms, dielectric strength is the ability of an insulating material to withstand applied electrical stress. It is defined as “the maximum electric field strength that a material can withstand intrinsically without breaking down, i.e., without experiencing failure of its insulating properties.”

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The Gund Company fabricates custom insulation components to manufacture and repair power generation equipment. Recently, a large OEM sent out a technical letter indicating the problems associated with using brominated insulation materials in generator field applications such as retaining ring insulation and end coil blocking.

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Grade N220 is a high-temperature laminate that provides outstanding performance in demanding applications.
» Excellent Mechanical Strength
» Long Term Thermal Stability
» Asbestos Free
» RoHS-Compliant
» Exceeds NEMA GPO – 1 Requirements.

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G-Flex™ YT510 is a high-performance insulation paper with unique advantages for many applications and industries. It is commonly used as the primary insulation in motors, transformers, generators, switchgear, and power electronics where harsh conditions exist. Compared to other insulation papers, the four primary advantages of G-flex include enhanced electrical properties, high thermal stability, excellent flame resistance, and good mechanical properties.

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Materials technology continues to evolve, offering higher performance materials for more demanding customer applications. Often, manufacturers fail to review their specifications to take advantage of these newer materials that provide improved performance at a lower cost.

Unfortunately, there is a tremendous amount of confusion in the marketplace regarding the thermal performance of insulation materials. A related document from The Gund Company, “Thermal Performance of Insulation Materials – A Review of Terminology & Methods,” addresses this topic specifically.

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MagNohl® is a magnetic wedge material that performs excellently in demanding induction motor and wind generator applications:

» Excellent Mechanical Strength

» Long-Term Thermal Stability

» Outstanding Magnetic Properties

» RoHS-Compliant.

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The Gund Company custom fabricates a wide range of insulation materials, based on the unique requirements of our customers. Our wide range of materials and fabrication capabilities offer numerous material options to our customers. Our approach to material selection starts by evaluating the customer’s application and specifying the material that suits their mechanical and electrical specifications. To help our customers learn more about aramid paper insulation materials like Nomex®, we have prepared this technical white paper.

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The Gund Company proudly presents RotoGuard Slot Insulation as a high-performance alternative for your slot insulation requirements. We have combined aerospace technology and proven electrical insulation materials to create RotoGuard Slot Insulation. This technology has been tested and established over a nine-year period to ensure that it can meet your most demanding requirements. 

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Large rotating machines contain many different insulating materials, providing specific protection to maintain efficiency and prevent damage during regular operation, upset conditions, and idle states. One type of specially-formulated insulation, semi-conductive, serves a structural purpose, but most importantly, corona/partial discharge protection.

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Standoff insulators are UL-recognized as panelboard and switchboard accessories according to the requirements in UL 891 Annex G. Annex G of UL 891 allows for switchboard sections and current transformer compartments to achieve a high Short-Circuit Current Rating (SCCR), without having to test. The advantage for the switchboard manufacturer is that they can have numerous custom bus bar configurations without having to test each one to get up to a 100kA SCCR. It also allows the manufacturer to use a wide variety of standoff insulators, provided they comply with the brace and support requirements of UL 891 Annex G. The manufacturer may also substitute standoff insulators without having to perform any SCCR testing, provided they are UL-recognized to meet the needs in UL 891 Annex G.

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Over the years, there has been considerable debate on determining and classifying the thermal performance of insulation materials used in electrical power systems equipment and related applications. Unfortunately, there is a tremendous amount of confusion in the marketplace regarding the thermal performance of insulation materials.

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Grades N155 and N220 are high-temperature pultruded glass fiber-reinforced thermoset resin rods that provide outstanding performance in demanding applications:

» Excellent mechanical strength 
» Long-term thermal stability
» RoHS-compliant 
» Cost-effective solution. 

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The Gund Company is consistently testing the products we manufacture and sell to provide engineers with the data they need. While it is widely known that the strength of a material is reduced at higher temperatures, the data for speciĮc properties and conĮgurations is not always available. The most common property tested at higher temperatures is Ňedžural strength. However, some mechanical properties are more negatively impacted by increasing temperature than others. For example, tensile strength is a reinforcement-driven property and typically does not show as strong a response to temperature as compressive strength, a matrix-driven property.

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The purpose of this document is to present the process used by The Gund Company to assist our customers in adding minor insulation materials to their dry-type transformer insulation systems to increase their sourcing flexibility, shorten their material lead times, lower their material inventories, and reduce their material costs.

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The purpose of this document is to present the process used by The Gund Company to assist our customers in adding equivalent insulation materials to their UL-recognized electrical and electronic equipment.

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The Gund Company fabricates custom electrical insulating components for power systems equipment, including generators, transformers, switchgear, power supplies, electric motors, and related equipment. Insulation material selection can be quite challenging due to the number of factors that influence insulation system engineering and insulation component design.

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In today’s technology-driven market, it is essential to understand the materials being specified and used in electrical and electronic equipment applications. The cost of failure is incredibly high in terms of safety, not to mention the cost in terms of downtime, productivity, and actual direct cost.

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Aramid papers are commonly used as a primary dielectric insulator in high-temperature electrical systems. Since aramid paper combines multiple unique characteristics such as heat and flame resistance, tear resistance, and dielectric performance, it has become the preferred primary insulation material for harsh environments.

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