Distribution Liquid Transformers
Hermetically sealed, low-loss distribution transformers for utility networks and industrial feeders. Available in ratings from 25 kVA to 5 MVA with guaranteed efficiency levels exceeding Tier 2 requirements.
Engineering Features
Hermetically Sealed
No conservator, no breather — completely sealed for maintenance-free operation.
Technical Data
| Parameter | Range / Value |
|---|---|
| Rated Power | 25 kVA – 5,000 kVA |
| Primary Voltage | 6.6 – 36 kV |
| Secondary Voltage | 230 / 400 V – 690 V |
| Frequency | 50 / 60 Hz |
| Impedance | 4% – 6% |
| Vector Group | Dyn11, Yyn0, Dzn0 |
| Temperature Rise | Top oil ≤ 60K, Winding ≤ 65K |
| Altitude | Up to 1000m (higher on request) |
| Ambient Temp | -25°C to +50°C |
| Efficiency | ≥ 99.2% at rated load |
Standard range parameters — custom specifications available on request.
Related glossary terms
IEEE C57.12
ANSI/IEEE distribution transformer standard
ANSI C57.12.00
General requirements liquid-immersed
DOE 2016
US Department of Energy efficiency rule
NEMA TR1
Sound level & loss tolerances
UL Listed
Underwriters Laboratories safety mark
IEEE C57.110
Harmonic-loaded transformer rating
ANSI C57.12 distribution transformers engineered for North American utility, co-operative and data-centre service. From 25 kVA single-phase pole-mount through 5 MVA three-phase units, every transformer is DOE 2016 efficiency compliant, UL listed and tested to IEEE C57.12.00 / C57.12.90. We supply Investor-Owned Utilities (Duke, Dominion, Eversource), NRECA member co-operatives and hyperscale data-centre campuses across Northern Virginia, Dallas-Fort Worth and the Phoenix corridor, with engineering and project-management support from our Gaithersburg, Maryland office.
Duke Energy & Dominion · East Coast IOU Feeders
NRECA Rural Electric Co-ops · Midwest & Southeast
Hyperscale Data Centre Campuses · Northern Virginia
Eversource Distribution · New England Service Territory
Municipal Public Power · APPA Member Utilities
University & Healthcare Campus Distribution
Where Distribution Liquid Transformers Excel.
US Investor-Owned Utilities
ANSI C57.12 distribution transformers for Duke, Dominion, Eversource and East-Coast IOU distribution feeders.
Rural Electric Co-operatives
DOE 2016 efficient distribution transformers for NRECA member co-ops across the Midwest, Texas and Southeast.
Hyperscale Data Centre Campuses
Pad-mountable distribution transformers for hyperscale data-centre campuses in Northern Virginia, Dallas and Phoenix corridors.
Municipal & Public Power
UL-listed distribution transformers for APPA municipal utilities, public-power authorities and university campuses.
Frequently Asked Questions
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Related Knowledge
FAQs, glossary terms and sizing steps mapped to this product.
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