Home/Products/Distribution Transformers

Liquid-Filled
Distribution
Transformers.

100 kVA through 5,000 kVA, voltage class up to 46 kV — designed to IEEE C57.12.34 and C57.12.36 at 60 Hz with US-standard bushings and taps. Standard lead time 3 to 5 months.

Request a quote → Download datasheet
CaptionThree-phase pad-mount, 1,500 kVA — hermetically sealed tank, hot-dip galvanized finish.
Asset refDT-024-1500-AZ-441
Voltage Class Up to 46 kV 15 / 25 / 34.5 / 46 kV grid
Power Rating 100 – 5,000 kVA Three-phase or single-phase
Lead Time 3 – 5 mo Standard scope, US-spec design
Volume 5,000+ / yr Combined annual capacity
01 · Tank configurations/ choose by site environment

Three tank constructions.
Two finishes.

Tank construction is the most consequential choice for distribution units — it drives maintenance posture, footprint, and total cost of ownership across the asset life.

Tank · 01 Most common

Hermetically sealed

No air contact with oil. No breather. Maintenance-free for the asset life — standard for utility radial feeders and pad-mount sites.

  • Corrugated wall construction
  • Sealed gas cushion, no breathing
  • No oil sampling required during service
Tank · 02

Gas-blanketed

Inert gas cushion above oil — combines moisture protection with the option to sample and replace oil during service.

  • Nitrogen blanket prevents oxidation
  • Pressure gauge + relief valve standard
  • For utility fleets with periodic sampling
Tank · 03 Large unit

Conservator-type

External conservator tank with breather and Buchholz relay. Standard for larger substation-type distribution units and 34.5 kV+ ratings.

  • External expansion conservator
  • Buchholz relay, silica-gel breather
  • For substation-type and 34.5 kV+ units
Finish Epoxy primer + topcoat(standard) Hot-dip galvanized(coastal · offshore · marine)
ConductorCu or Al
02 · Voltage map/ class · US grid · use

Four voltage bands,
built for US grid practice.

Designed to IEEE C57.12.34 (three-phase pad-mount) and C57.12.36 (single-phase pad-mount). 60 Hz. US-standard bushings, taps, and BIL ladder.

Up to 15kV
12.47 / 13.2 / 13.8 kV
Residential pad-mount · commercial feeders
15 – 25kV
24.94 kV
Utility distribution · industrial site primary
25 – 34.5kV
34.5 kV
Utility radial feeders · large industrial sites
34.5 – 46kV
46 / 46 kV
Substation-type distribution · sub-transmission
03 · Scale + standards/ fleet-grade output

Built like distribution.
Tested like transmission.

Volume is the highest in the ATEF portfolio — but every unit moves through the same HV test bay and the same IEEE C57.12.90 routine-test protocol as the transmission lines.

Annual capacity 5,000+ Units / year combined across Baku and Hust at full ramp.
Design standards IEEE C57.12.34
+ .36 Three- and single-phase pad-mount. ANSI + NEMA TR1. IEC 60076 for export.
Type-tested by KEMA
+ CESI Serial production. Project-specific IEEE C57.12.90 reports under each US contract.
Certified ISO 9001
14001 · 45001 Quality, environment, safety — across both manufacturing sites.
04 · Related/ adjacent lines

Adjacent product lines.

Higher voltages handled by power transformers, indoor-only applications served by cast-resin dry-type.

Power transformers

For transmission and sub-transmission voltage classes — step-up GSU, autotransformers, station, EAF, traction.

View power transformers →

Cast-resin dry-type

For indoor substations, data centers, hospitals — where fire load or oil leakage is unacceptable.

View dry-type →
05 · Request a quote

Fleet order or
one-off spec?

Send the count, voltage class, environmental conditions, and finish requirement. We confirm tank configuration, lead time, and unit pricing within one business day.

Request a quote Download datasheet
VoltageUp to 46 kV
Rating100 – 5,000 kVA
Lead time3 – 5 months