VIRGINIA TRANSFORMER
Precisely Your Power Solution
RENEWABlE ENERGY
WIND / SOlAR TRANSFORMERS
long life, reliability, VAlUE
Virginia Transformer has over three
decades of experience in the
custom design and manufacturing
of power transformers. That
experience extends across every
conceivable market – utility,
industrial, commercial, alternative
energy, marine/offshore, transit,
data centers. Anywhere that
electrical power needs to be
generated, transmitted or
distributed, you’ll find VT transformers
in operation. We offer solutions
for the widest range of markets
and applications of any power
transformer company in North
America. Whatever your particular
needs are, we can provide Precisely
Your Power Solution.
The history of Virginia Transformer
is one of custom transformer
designing. We began manufacturing
transformers for the mining industry,
and these liquid-filled and dry type
transformers had to be designed to
meet very low profile construction
standards and to operate reliably in
extremely harsh, high-temperature
environments. The knowledge
gained from these early projects
guided Virginia Transformer in the
development of numerous design
innovations. As our product line
has, and continues to expand, we
continue to produce innovative
solutions for power transformer
applications developing the best
possible transformer to meet our
customers’ specific needs.
Virginia Transformers experience,
expertise and ingenuity continue
to expand and develop along with
the breadth of our product range.
VT has moved to the forefront of
transformer design for alternative
energy projects, and has become
the manufacturer of choice for
numerous wind farm projects. We
continually improve the efficiency
of our processes throughout our
facilities. Virginia Transformer
remains committed to providing
comprehensive solutions for all your
power needs with the shortest lead
times in the industry, and the highest
quality and reliability available.
GENERATING WIND POWER
COLLECTOR
TRANSFORMER
GSU PAD MOUNT
TRANSFORMER
(at base of turbine)
PHOTOVOLTAIC
MODULES
TRANSFORMER TO GRID
GENERATING SOLAR
POWER
INVERTER
PAD MOUNT
TRANSFORMER
GSU
STEP UP
TRANSFORMER
TRANSFORMER TO GRID
• Edom Hills / Desert Springs, CA / 15 MVA
• Roe Heights, SD / 17 MVA (LTC)
• Hilo, HI / 15 MVA (LTC)
• Prince Edward Island / 30 MVA
• Wolverine Creek Wind Farm / Idaho Falls, ID
45/60/76 MVA
• Bangore ME. / 37.5 MVA (LTC)
• UPC Wind / Prattsburgh, NY / 39 MVA
• Ciambro / Stretton, ME / Grounding Transformer
WIND APPlICATIONS
Virginia Transformer’s new generation
line of Wind/Solar GSU Pad Mounted
Transformers are designed to outlast
the life of the wind turbine – up to
a 30 year life without replacement.
This could impact the potential lost
revenue/O & M costs over the life of a
typical wind farm by more than 15%
up to $8-10 Million.
Typical “Distribution Type”
Transformers, as presently used by
the industry, are experiencing an
abnormal rate of premature failures
due to the partial discharge and
harmonics created by the new Type
3/4 Turbines. Some transformers are
failing in as little as 5-6 years, with no
warranty provisions.
This could lead to replacing
transformers 4-5 times during the
life of the turbine (25 - 30 years) – A
hidden expense and lost revenue
when calculating future O & M costs
of operation. And the wind farm
owner may not be aware of this cost
when negotiating its’ PPA contract.
Not only the cost of the transformers
but also the labor and downtime,
plus associated expenses and lost
revenue.
Virginia Transformer has developed
special methods to eliminate
potential problems in transformers
used in wind applications. The
magnetics of the transformer are
designed in which the harmonics
are absorbed/ameliorated. Special
shields provide further filtering of the
harmonics from passing from one
side to the other. Specially designed
windings and cooling arrangements
take away the effects of hotspots and increase the life of the
transformer substantially.
WIND TRANSFORMER SPECS
SPECIFICATION
Pad Mounted, loop-Feed,
WIND
TURBINE
WIND
TURBINE
GENERATOR
GENERATOR
GENERATOR
GENERATOR
INVERTER
INVERTER
INVERTER
INVERTER
FIl TER
FIl TER
Y/A
Y/A
(1 - 3) MVA
WIND TURBINE
TRANSFORMER
www.vatransformer.com
FIl TER
FIl TER
Y/A
Y/A
(1 - 3) MVA
WIND TURBINE
TRANSFORMER
(1 - 3) MVA
WIND TURBINE
TRANSFORMER
COll ECTOR
TRANSFORMER
COll ECTOR
TRANSFORMER
TO GRID
GRID TIE
TRANSFORMER
TO GRID
KVA: 1700
2200 2600 or as specified
Secondary Kv: 34.5 Primary V: 690V Z:5.75% subject to ANSI tolerance
Windings: CU / Al
Efficiency: > 99.4 - 99.5%
losses: low losses for Nll (Apprx. 2350 W), ll can be slightly higher
(Approx. 13600W)* * loss fig. based on a 1600 KVA pad mounted transformer
load loss temperature: 85º C
BIl: HV-200 KV, lV - 30 KV
Vector Group: Delta/grounded Wye
Frequency: 60 HZ
Average winding Temp Rise: 65º C
Fluid: Mineral Oil / FR3 / Beta Fluid
Mechanical HV and lV compartments are separated by a mechanical
barrier. lV on Right and HV on left when viewed from front.
lV compartment door flat panel design
HV door open only after lV door is opened
Dimensions: Height 75”, width 75”, Depth 35” (all dimensions approximate
depending on KVA.)
Compartment depth: C57.12.34
HV bushings: loop feed 6 bushings 600 A
lV bushings: 3 suitable for 30 KV BIl
DETC: + 5% to -5% in 2.5% steps
Gauges: PRD, Pressure level indicator, llG, Drain and filter valve, oil sampling
valve
WIND
TURBINE
WIND
TURBINE
PA SoLar Park, 9/11.5 MVA, 69 kV
Nesquehoning, PA
ALPaugh N. SoLar Farm,
15/16.8/20/22.4 MVA, 117.5 kV, 8 kV
33/44/55 MVA, 117.5 kV
Alpaugh, CA
FRV SOLAR FARM,
12/16/20 MVA, 46 kV (Step up)
Marana, AZ
GREATER SANDHILL SOLAR FARM,
12/16/20 MVA, 69 kV
Mosca, CO
KALAELOA SOLAR II Project
(Sunpower), 5 MVA, 46 kV
Oahu, HI
AVENAL SOLAR FARM (2),
15/20/25 MVA, 73 kV
Avenal City, CA
GRAYBAR/ROSENDIN ELECTRIC (2),
35/46.667/58.333 MVA, 115 kV
Puerto Rico
SOlAR APPlICATIONS
Virginia Transformer Corp. has been
designing and building power
transformers for Solar applications
for over ten (10) years. New figures
released by SEIA (Solar Energy Industries
Association) state that the total MW of
projects under construction and under
development as of the end of 2012
is around 30,265 MW in the U.S. alone
and still climbing. This represents a
growth rate of 85% from an installation
perspective over the year 2011. The U.S.
happens to be the fourth largest solar
market in the world and is expected to
grow even further.
Virginia Transformer understands the
needs of the solar developers and has
successfully designed and shipped
transformers for power distribution
applications in a solar farm using
PV modules in North America. We
have been successfully meeting the
stringent specifications of customers
like NPI, Recurrent Energy, and have
a design which precisely fits these
applications. The transformers are
specially designed with low losses but
high efficiency standards to meet the
industry’s stringent demands. Our design
of these transformers accommodates
the additional thermal heating due to
harmonics in the current (even up to K
factor =20) during DC to AC conversion
of solar energy power plants. Since
Virginia Transformer boasts some of the
best lead times for these transformers
in the industry, this is a major benefit
for the developers to meet start up
commitments.
VTC also has embarked on designing
small GSU’s for inverter house
applications with special K factor and
with environmentally friendly fluid like
FR3. The units meet ANSI/NEMA as
well as international standards and
confirm to low losses and high efficiency
standards. Virginia Transformer is
already working with some leading
manufacturers of inverter houses as
a preferred OEM manufacturer of
small GSU’s. All of our transformers are
designed with the same care to ensure
that it has a long life that meets the
requirements for a full life cycle which
may be anywhere from 25 - 30 years.
SOlAR TRANSFORMER SPECS
SPECIFICATION
Solar Application Transformer
Rating: 1 MVA
1.5 MVA
2 MVA
or as specified
Temp. Rise: 65º C
Cooling Class: KNAN / ONAN
Frequency: 60 HZ
Duty Cycle: Designed for Step Up Operation
Insulating Fluid: FR3 / Mineral Oil / BETA
Altitude: Designed for operation at 1000Mt (3300 ft) above Sea level
Sound level: NEMA TR1 Standard
Efficiency Standard: CSA, ANSI
Harmonic K Factor: None
Primary Voltage: 27.6 KV, 36.5 KV or any others
BIl: 150 KV
KV Class: 35 KV
Primary Configuration: Dead Front
Primary Configuration: loop Feed
Taps: 2 - 2.5% taps above and 2 - 2.5% taps below nominal
Tap Changer: 100 A 5 position tap changer
Primary Bushings: 600 Amp 35 KV Copper deadbreak one piece bushing (6)
load Break Switching: 300 A two position break switch
Arrestors: under oil, 3
Fuses: Cartridge fusing (3) in series with partial range current limiting fuses
Secondary Voltage: 480 V 690 V
BIl: 30 KV
Secondary KV Class: 1.2 KV
Secondary Bushings: Integral Aluminum & 12 hole spade bushings (4)
Secondary Configuration: live front
Coating: ANSI 61 Grey / or as specified
PHOTOVOl TAIC
MODulE 1
PHOTOVOl TAIC
MODulE 2
INVERTER
INVERTER
FILTER
FIl TER
PHOTOVOl TAIC
MODulE 3
PHOTOVOl TAIC
MODulE 4
INVERTER
INVERTER
FIl TER
FIl TER
TRANSFORMER
TRANSFORMER
COLLECTOR
TRANSFORMER
GRID TIE
TRANSFORMER
TO GRID
Virginia Transformer is a leader in custom power transformers
engineered precisely for your application and optimized for
performance and long life.
Corporate Office
220 Glade View Drive
Roanoke, VA 24012
540.345.9892
Fax 540.342.7692
VTC-U
3770 Poleline Rd.
Bldg. #37
Pocatello, ID 83201
208.238.0720
Fax 208.238.1678
VTC-W
Complejo Industrial Chihuahua
Ave. Homero #3307
Chihuahua, Mexico
52.614.483.0000
Fax 52.614.481.4900
VTC-I
Engineering Procurement Facility
Delhi, India
Field Service – Installation Maintenance Spare Parts
(Available optionally after delivery)
1-800-882-3944
24/7/365
www.vatransformer.com
For Sales assistance please contact our Corporate Sales Office 540.345.9892
Visit www.vatransformer.com to find the name and contact information for
local sales representative
Information included in this catalog was believed correct at the time of printing. Virginia Transformer Corporation reserves the right
to discontinue products or change specifications without prior notification. © 1-2013 Virginia Transformer Corp