Liquid-Filled Transformers
Custom Transformers at Standard Prices
NIAGARA TRANSFORMER CORP.
Induction Furnace Transformer
Cycloconverter Rectifier Duty Transformer
Arc Furnace Transformer
Full Range of Capability
T
he strength of Niagara Transformer Corp. is
our ability to understand customers’ requirements and to respond by providing transformers that meet these demanding specifications.
Niagara Transformer produces liquid-filled transformers up to 20 MVA and 69 kV high voltage (350
kV BIL) either with oil filled, R-Temp®, beta, alpha,
ester, Envirotemp®, or silicone fluids.
Depending on the application, we offer conventional liquid-filled, sealed tank, conservator, or positive pressure nitrogen systems.
Our transformers are built using copper, aluminum
windings with circular, rectangular, or disk-style
coil construction.
• Motor drive duty
• Primary unit substations with integrated primary
and secondary switchgear
• Arc or induction furnace
• Test
• Retrofit
Types of Transformers
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Rectifier transformers
Unit substation transformers
On-load tap-changing transformers
Multi-tapped transformers
Auto transformers
Scott-connected transformers
Pad-mount transformers
Sealed liquid-filled transformers
Design Styles
Niagara provides transformers with manual and
motorized de-energized tap changers and with
load tap-changing equipment. We can also provide transformers with radiators, forced oil air,
forced oil water, or oil natural water-cooled heat
exchangers.
Applications
• Process/high current rectification
• Traction duty
Transformers can be designed to accommodate
the following:
• Variable frequency motor drive
• Compartmentalized pad-mount
• Autotransformer
• Motor starting
• Corrosive/hazardous environments
• High ambient temperature/elevation
• Indoor/outdoor
• Dimensional restrictions
Niagara Transformer Corp.
Toll-Free: 800-817-5652 • www.niagaratransformer.com
Unit Substation Power Transformer
Forced Oil Cooled Power Transformer
with Primary Switch
Regulating Auto-Transformer
with On-Load Tap Changer
Built to Your Requirements
B
y providing you with the exact configuration
your transformer requires, Niagara
Transformer minimizes the time and cost of
field installation. There are no standard models
at Niagara Transformer. Our design approach
ensures that you receive exactly what you need at
a competitive price.
We can provide transformers
with these specialized options:
• Coordinated HV and LV
termination location
• Coordinated HV and LV
elevation
• Special dimensions
• Special arrangement
• Nonstandard kVA
• Nonstandard voltages
• Nonstandard BIL
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Nonstandard sound levels
Special impedance (low or high)
Special termination arrangements
Low operating temperature rises
Special footprints
Retrofit accessory location
Special paint color coordination
24-Hour Quotation Turnaround
Niagara Transformer guarantees
twenty-four hour turnaround on
quotations including complete bill of
material, technical data, and quotation sketches as required. If you need
a faster response, then let us know.
We will strive to meet your quotation
requirements. Call toll-free 800-8175652.
Utility Substation Power Transformer
Niagara Transformer Corp.
Toll-Free: 800-817-5652 • www.niagaratransformer.com
Unit Substation Transformer with
Conservator
Glass Furnace Transformer
High-Current Process Rectifier
Duty Transformer
Superior Service & Value
T
he hallmark of Niagara Transformer is our
value-added approach to transformer
design and manufacturing. Our goal is to
provide custom-designed transformers that meet
your specifications and requirements at “standard”
transformer prices.
On-Time Delivery
We understand that our customers work on rigid
schedules. When Niagara Transformer confirms a
delivery, it is guaranteed to be on site when you
need it.
Unrivaled Experience
Our products are noted for their long-term quality,
and our service is responsive and customerfocused. If you have any questions about our products or company, please feel free to contact us to
speak to a sales engineer.
Niagara Transformer Corp. has manufactured
transformers for more than 60 years. Our engineering and manufacturing departments are comprised of professionals averaging more than 20
years of experience and include individuals recruited from organizations throughout the industry.
Quality Standards
Niagara Transformer exceeds the stringent quality
requirements of military, laboratory, OEM, utility,
and industrial customers around the world.
Niagara’s transformers are operating not only
throughout the United States, but also in sixty-five
other countries around the globe.
All Niagara Transformer products comply with the
latest ANSI, IEEE, NEMA, IEC and CSA requirements.
Our company joined NEMA in 1942 and continues
to be an international leader in standards development through IEEE, ANSI and IEC.
We can also offer special certifications from UL,
CSA, and professional engineer seismic approval,
as well as conform to international standards and
verifying authorities such as Det Norske Veritas
and the American Bureau of Shipping.
Contact us for standard and custom features,
accessories, ratings, or more information
about our complete range of liquid-filled transformers.
Niagara Transformer Corp.
Toll-Free: 800-817-5652 • www.niagaratransformer.com
General Specifications
Coils
All coils are designed based on the customer’s specific application. The kVA, voltage rating, and the
application dictate the use of either circular or
rectangular forms with windings as follows:
Continuous Disk - for medium to high-voltage applications where impulse strength is
important.
Barrel - for medium-voltage and
medium-current applications.
Helical - for high-current applications
offering high short-circuit strength
and low winding eddy current losses.
Sheet - for low-voltage, high-current
applications and the elimination of
axial forces on winding short circuits.
Coils can be furnished with temperature rise ratings of 55˚C above ambient. Enhanced rating of units is available for 65˚C rise units.
Cores
Cores are made from high-grade, non-aging, grain-oriented, cold-rolled silicone steel. They are laminated for
high-magnetic permeability and low hysteresis and
eddy current losses.
Niagara Transformer offers computer-generated cores
designed for the customer’s specific application. Wound
cores for low-power and stacked cores for high-power
applications are offered. Stacked cores can be rectangular or cruciform (stepped). Either can be butt-cut,
mitered, or step-lap mitered. Specialized cores, such as
4-leg, 5-leg, and gapped also can be supplied.
Insulating Fluids
Niagara Transformer can supply every cooling fluid currently available. Mineral oil or Envirotemp® typically are
used outdoors. R-Temp®, beta, alpha, ester, and silicone
fluids are offered when higher fire point liquids are needed.
Tank Design
Niagara liquid-filled tanks are welded, oil-tight steel construction with structural bases designed to permit skidding or rolling in either centerline direction. Sealed tanks
are designed to withstand, without permanent deformation, pressure greater than 25% of the maximum operating pressure. Large tank designs are suitable for full
vacuum processing. Niagara Transformer can accommodate any required orientation of terminals - from
simple cable terminals to inline substation
configuration, to custom terminal locations.
Types of oil preservation systems include:
Sealed Tank Construction - where the
transformer is sealed airtight and a gas
space of nitrogen above the oil serves as a
pressure buffer.
Inert Gas System - where the breathing
of inert gas is controlled to maintain a
positive pressure of nitrogen within the
transformer tank.
Conservator Style Design - where a
vented reservoir tank allows for thermal
expansion and contraction of the transformer liquid. Suitable for forced oil cooling
designs.
Finishes
Niagara Transformer’s standard paint finish is ANSI
#61, Light Gray. We can furnish any ANSI paint color
specified, or match a paint color if a paint chip is supplied. Special finishes can be supplied on request for:
• Chemical and/or corrosive environments
• High-humidity locations
• Offshore and coastal, salt-laden environments
Niagara Transformer can provide terminal locations in
any ANSI segment number requested, including any of
the following individually or in any combination:
• Full height terminal chambers
• Partial height terminal chambers
• Wall-mounted throats
• Wall-mounted flanges
• Cover-mounted
Cooling
Cooling is performed by panel-type radiators that provide additional radiating surfaces for self-cooled transformers. Additional cooling can be added using singlestage, forced-air cooling to increase capacity within
guaranteed temperature limits for:
• Continuous operation
• Periods of overloading
• Seasonal changes of loading
This extra cooling is provided by motor-driven fans
mounted on the transformer base.
Niagara Transformer Corp.
Toll-Free: 800-817-5652 • www.niagaratransformer.com
Mission Statement
The mission of Niagara Transformer
Corporation is to be a respected supplier
of custom-designed electrical equipment
and to support these products with
responsive technical and customer service.
Our company is recognized for its engineering and manufacturing flexibility and
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experience, product quality, industry reputation, and long-term dependability.
Our customers are around the world as
well as around the corner. In addition to
supplying transformers throughout the
United States and its territories, we have
recently provided transformers to more
than 65 countries around the world.
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NIAGARA TRANSFORMER CORP.
P.O. Box 233
1747 Dale Road
Buffalo, New York 14225
Phone: 716-896-6500
Toll-Free: 800-817-5652
Fax: 716-896-8871
E-mail: mail@niagaratransformer.com
Website: www.niagaratransformer.com
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