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Since 1983
Virginia Transformer Corp (VTC) has offered a superior encapsulated dry type
transformer that withstands the toughest environments. We call it
UNIClad®. Our customers know it as the system that offers unmatched
design integrity and strength compared to traditional cast coil products.
UNIClad® is simply the best choice for your applications with high humidity,
contaminated conditions, short-circuit loading and impact loading. And
you'll spend less for UNIClad® than a conventional unit because we design
exactly the transformer you need. With VTC, you never have to overbuy
simply because what you need isn't standard.
VTC unveiled
UNIClad® in the early 1980s to address the growing need for a product that
could outperform traditional systems. Standard cast coil construction
can withstand short-circuit forces, but its brittle epoxy construction is
prone to cracking from thermal, mechanical and electrical forces. This
cracking allows moisture and corrosion to attack the coil causing failure.
Our UNIClad® coils withstand thermal cycling forces, short-circuit shock and
operating vibration without cracking, thanks to our unique encapsulation and
sealing process. We completely seal UNIClad® coils with a 220°
C-rated, flexible polyester varnish applied under vacuum and pressure.
This tough, flexible cladding material is also highly chemical and moisture
resistant. Besides our vacuum sealing process, VTC uses NOMEX on
UNIClad® coils to ensure flexibility of the insulation system and the
highest thermal rating for the longest life. UNIClad® can even
withstand total water immersion for 24 hours with no change in seal
integrity.
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BETTER DESIGN MEANS LONGER UNIT LIFE
By filling the
coils with low-viscosity 100% solid polyester varnish under vacuum and
pressure, VTC also assures void-free coils.
UNIClad® coils exhibit very low partial discharge levels, which means longer
life, a reduction in the possibility of internal dielectric failure, and
partial discharge-free operations maintained for the life of the
transformer. We seal coil ends using an evacuated resin system
formulated to match the coefficient of thermal expansion of the coil.
UNIClad® 220°C insulation system and 115°C temperature rise design provides
a continuous overload capability of approximately 15%. Even under
overload conditions UNIClad® will maintain temperatures within the
insulation rating. The solid filling of our coils improves thermal
conductivity, allowing the coils to run cooler and resulting in longer unit
life. On average, the life expectancy of a UNIClad® is 40 years at a
constant rated load, subject to proper application, protection, maintenance
and duty cycle.
UNIClad® CUSTOM
DESIGNS SAVE MONEY
VTC custom designs all
UNIClad® units, resulting in significant dollar savings to you. We
simply don't believe in forcing customers to choose from pre-determined
molds, designs, or specifications. Such on-size-fits-all product
offerings often force customers to "size-up" their unit, wasting money and
taking up extra space at their site. With UNIClad®, you'll pay only
for what you need. And you can expect delivery of your UNIClad® system
in about half the time needed for standard cast coil units thanks to our
commitment to global sourcing.
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UNIClad® THE PREMIUM
ENCAPSULATED DRY-TYPE TRANSFORMER
UNIClad® VS. CAST
COIL: THE CHOICE IS CLEAR
VTC Developed
UNIClad® to operate under demanding applications in increasingly harsh
environments. Because it is designed to withstand industrial fumes and
vapors, fibrous and particle contamination, high temperature and humidity,
short circuit forces, and electrical voltage impulses, UNIClad® is the cost
effective alternative to liquid filled or cast coil transformers.
UNIClad®. For power, rectifier, drive isolation and generator exciters
up to 15,000 KVA, 35 kV class. |
