New Liquid-Filled Transformer Insulation from 3M Helps Improve the Transformer Performance
August 26 2015 - 12:32PM
Business Wire
New insulation for oil-filled transformers can
help increase transformer overload capabilities and provides size
reduction opportunities
3M today introduced an improved standard for insulating
high-temperature, liquid-filled distribution transformers. New
Liquid-Filled Transformer Insulation (LFT insulation) from 3M is
designed to offer excellent thermal stability, low moisture
absorption, high thermal conductivity, and long-term
reliability.
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New Liquid-Filled Transformer Insulation
(LFT insulation) from 3M is designed to offer excellent thermal
stability, low moisture absorption, high thermal conductivity, and
long-term reliability. (Photo: 3M)
The need for new materials that can improve transformer
performance comes as global efficiency requirements have increased.
These new standards are resulting in bigger and heavier
transformers that may require pole and pad-mount size to
increase.
Because of new standards, such as IEEE C57.154™ and IEC
60076-14, LFT insulation combined with high-temperature insulation
liquids and components can help reduce transformer size. For
example, if a transformer coil design is optimized for a higher
thermal class, a transformer with LFT insulation can be made with
less conductor, less liquid, a smaller tank, and potentially lower
overall material cost, depending upon design.
Greater Thermal Stability
In long-term thermal aging tests conducted in accordance with
IEEE C57.100™-2011 Annex A and B, LFT insulation has been assigned
a 155 degrees Celsius Thermal Class rating in mineral oil – 35
degrees Celsius higher than thermally upgraded kraft
insulation.
Low Moisture Absorption
LFT insulation typically achieves 1 percent moisture content by
weight at 50 percent relative humidity and less than 5 percent
moisture content at 95 percent relative humidity, which can be up
to seven times less than thermally upgraded kraft insulation. This
can help reduce energy costs in manufacturing, because the reduced
moisture content of LFT insulation means less energy is required to
dry transformer coils.
Higher Thermal Conductivity
LFT insulation provides higher thermal conductivity almost 10
percent greater than conventional cellulose insulation, which
increases heat dissipation and may reduce coil hot spot
temperatures.
Meets Sustainability Requirements
With LFT insulation, transformer designers can meet some of the
most demanding sustainability requirements with minimal
environmental impact. By increasing thermal class and thermal
conductivity, transformers can be designed smaller with less
materials and lower subsequent lifecycle waste. LFT insulation is
RoHS and REACH Compliant.
Long-Term Reliability
LFT insulation resists degradation when exposed to moisture from
water ingress. This increases long-term reliability, which is a key
concern for liquid-filled transformers that must meet lifetime
requirements of most global electrical utilities. For more
information, go to www.3M.com/LFTinsulation.
Since the invention of vinyl electrical tape in 1946, the 3M
Electrical Markets Division has designed and manufactured reliable
products for some of the world’s leading industries, including
energy, commercial and industrial electrical construction, oil and
gas, mining, water, transportation and manufacturing. Today, the
division deploys technology to create new solutions to help meet
energy and infrastructure challenges.
About 3M
At 3M, we apply science in collaborative ways to improve lives
daily. With $32 billion in sales, our 90,000 employees connect with
customers all around the world. Learn more about 3M’s creative
solutions to the world’s problems at www.3M.com or on Twitter @3M
or @3MNewsroom.
3M is a trademark of 3M Company.The IEEE standards cited are
trademarks of the Institute of Electrical and Electronics
Engineers, Inc. (IEEE). All other trademarks listed herein are
owned by their respective companies.
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3M Media ContactJane Kovacs, 512-984-67473M Media Relations
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