Instruction Manual

5
Ventilated Distribution Transformers
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200
Figure 1
Distribution Transformers manufactured after January 1,
2007mustmeetspecicenergyefciencyrequirements.
U.S.DepartmentofEnergydenestheterm“distribution
transformers” as any transformer which:
• Hasaninputvoltageof34.5kVAorless
• Hasanoutputvoltageof600Vorless
• Isratedforoperationatafrequencyof60Hz
•Hasacapacityof10kVAto2500kVAfor
liquid-immersed units and 15 kVA to 2500 kVA
for dry-type units
The following special purpose transformers are excluded
fromthedenitionof“distributiontransformers”andare,
therefore,notrequiredtomeettheenergyefciency
standards at this time:
• Autotransformers
• Drive(isolation)transformers
• Groundingtransformers
• Machine-tool(control)transformers
• Non-ventilatedtransformers
• RectierandRegulatingtransformers
• Sealedtransformers
• Special-impedancetransformers
• Testingtransformers
• Transformerwithtaprangeof20%ormore
• Uninterruptiblepowersupplytransformers
• Weldingtransformers
Benefiting from Higher Energy Efficiencies
Increasingtheenergyefciencyofatransformerallowsthe
unit to operate at the same level of power with less energy
being wasted in the process. Decreasing usage through
reduced waste by just .03% over the next 20 years cuts the
need for new power generation in the United States by 60 to
66 million kw.
SolaHD has been engineering and producing energy
efcienttransformersforoveradecadeyears.TheSolaHD
energyefcienttransformersareoptimizedtomeetNEMA’s
TP-1 limits for load losses calculated to 35% of the name
plate rating, yet are the same compact size and footprint as
its’conventional150˚Criseunits.
The example pictured in Figure 1 shows the differences in
efciencyfortheoldstandardmodelcomparedtothe
compliant model. At 35% load, the absolute difference in
efciencyisonly1.7%.However,thatrepresentsa52%
reduction in wasted energy. Taking that 52% reduction in
wasted energy and multiplying it across all the energy
consumed results in substantial savings.
SolaHD offers the following family of transformers that meet
thestrictefciencystandards.Theefcienciesofthese
transformers are optimized for the load losses calculated
at 35% of the name plate rating. This 35% represents an
industry average load of most LVGP transformers.
Applications
Any situation where the available voltage must be changed
toaccommodatethevoltagerequiredbythespecic
electrical circuit or connected equipment. For many
electrical circuits, the National Electrical Code (NEC)
requires a separately derived neutral secondary connection
provided by Delta-Wye connected transformers.
Distribution transformers can be located close to the load.
No vaults are required for installation and no long, expensive
feeder lines are needed. Common applications include
inductive and resistive loads such as motors, lighting and
heating.
General Purpose Transformers
Transformersdesignedtomeetthehighenergyefciencies
required by NEMA Standard TP-1.
Low Temperature Rise Transformers
Transformers designed to limit the temperature rise of the
core and coil assembly to either 80°C or 115°C above a
40°C ambient. Reduction in temperature rise increases
reliability.
K-Factor Transformers
Transformers designed to withstand the electrical anomalies
associated with solid state equipment and DC power
supplies (excluding SCR variable speed motor drives)
without derating the nameplate kVA.
Copper Wound Transformers
SolaHD general purpose transformers have standard
aluminum coil windings. As an option, we offer a selection
with copper windings.