Electrical insulating materials and transformers

A technology for insulating products and insulating systems, which can be used in heterogeneous insulating materials, insulators, transformer/inductor components, etc., and can solve problems such as limitations

Active Publication Date: 2019-03-29
3M INNOVATIVE PROPERTIES CO
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The maximum operating temperature of a liquid-immersed transformer utilizing kraft paper isolation is limited by the thermal properties of the kraft paper

Method used

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  • Electrical insulating materials and transformers
  • Electrical insulating materials and transformers
  • Electrical insulating materials and transformers

Examples

Experimental program
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Effect test

Embodiment

[0043] Examples and comparative examples provided below are provided to facilitate the understanding of the present invention, and these examples and comparative examples should not be construed as limiting the scope of the present invention. All parts and percentages are by weight unless otherwise indicated. The following illustrative examples and comparative examples were evaluated using the test methods and protocols described below.

[0044] Sample Preparation :

[0045] Exemplary electrically insulating nonwoven papers were made using methods known in the art, as follows:

[0046] 6% by weight of microglass (B-04 from Lauscha Fiber International), 64% by weight of exfoliated kaolin (HYDRAPRINT from KaMin, LLC, USA), 13% poly(vinyl alcohol) fibers (from Minifibers Inc, USA, fully hydrolyzed, 1.8 denier x 6 mm, fiber tenacity of 13 g / denier) and 17 wt% of (HYCAR 26362 from Lubrizol Corp) was dispersed in water to form a slurry with a solids content of about 2% by wei...

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Abstract

The present invention discloses an article comprising an inorganic filler, fully hydrolyzed polyvinyl alcohol fibers, a polymer matrix, and high surface area fibers. The article can be made into electrical insulating paper for electrical equipment, such as liquid-immersed transformers, which can thus be substantially free of cellulose.

Description

technical field [0001] The present invention relates to materials suitable for use in electrical insulation applications. In particular, the invention relates to electrical insulating materials suitable for use in transformers, such as liquid-immersed transformers. Background technique [0002] Electrical equipment such as electric motors, generators and transformers often require some form of dielectric insulation to isolate adjacent conductors. A common insulating material is kraft paper, a cellulose-based material commonly utilized in liquid-immersed transformers. [0003] However, cellulose paper has several disadvantages, such as high moisture absorption, generation of water when degraded, and limited thermal performance. Current liquid-immersed transformers require a moisture content of less than 0.5% by weight in order to operate reliably throughout the designed product life of the liquid-immersed transformer. Water contamination in liquid-immersed transformers lea...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H01B3/02H01B7/02
CPCD21H13/16D21H17/67D21H21/18D21H13/10D21H13/40H01B3/002H01B3/28H01B3/448H01B3/47H01F27/327H01F27/2876
Inventor 罗伯特·H·特平雷撒·M·布鲁宁大卫·V·马奥尼米切尔·T·黄大卫·S·斯坦克斯马丁·H·福克斯
Owner 3M INNOVATIVE PROPERTIES CO
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