Oil-Immersed Distribution Transformers

33kV 1250kVA & 1600kVA Three-Phase Outdoor Oil-Immersed Power Transformer (Copper)

Built for outdoor substation duty, this three-phase oil-immersed power transformer is available at 1250 kVA and 1600 kVA within a broader 15 kVA–31500 kVA…

Technical specifications

Technical specifications of 33kV 1250kVA & 1600kVA Three-Phase Outdoor Oil-Immersed Power Transformer (Copper)
ParameterValue
Product TypeThree-Phase Oil-Immersed Distribution Transformer
Rated Capacity1250 kVA & 1600 kVA (range 15 kVA–31500 kVA)
Input Voltage33 / 35 kV
Output Voltage400 / 415 V
Frequency50 / 60 Hz
PhaseThree
Winding MaterialCopper / Aluminium
Coil StructureFully Sealed Construction
Vector GroupDyn11 / Yyn0 / Yd11 / YNd11 / Dyn5
Service Life20–30 Years
StandardIEC / GB
CertificationIEC, CE, ISO9001, ISO14001, ISO45001, CQC, GOST, EAC
PackingWooden Case
Package Size280 × 200 × 250 cm
Gross Weight5400 kg

These specifications reflect the product data supplied. Final dimensions, materials, colors, and packaging are confirmed at the sample and order stage.

Why buyers choose it

  • A fully sealed, corrugated-fin tank that keeps oil from oxidizing, requires no breathing, and cuts maintenance down
  • High efficiency delivered through low no-load loss and a low operating temperature
  • Rated for 20 to 30 years of service, holding up well in tough outdoor conditions
  • A wide span of capacity and voltage options with vector group customization
  • Certification coverage spanning IEC, CE, ISO9001/14001/45001, CQC, GOST, and EAC

Standards & certification

Designed and tested to IEC / GB. Millenium production is certified to ISO 9001, ISO 14001 and ISO 45001; the product family carries CE (ECM), UDEM attestation and an EAC declaration of conformity. Every unit passes routine factory tests before dispatch.

Product details

Built for outdoor substation duty, this three-phase oil-immersed power transformer is available at 1250 kVA and 1600 kVA within a broader 15 kVA–31500 kVA lineup, converting 33/35 kV down to 400/415 V. A sealed tank with corrugated fins keeps the oil free from oxidation and removes the need for topping-up, which supports a 20 to 30 year service life outdoors. Windings are offered in copper or aluminium, manufactured to IEC and GB standards.

Design & Construction

The steel tank is hermetically sealed and wrapped in corrugated cooling fins, keeping the transformer oil shielded from outside air so it resists oxidation and moisture while still shedding heat effectively. HV porcelain bushings and LV terminals sit on the tank cover, and pressure-relief plus oil-level protection are built into the structure. Together, this gives stable, low-loss performance with minimal upkeep.

Applications

This transformer suits outdoor and indoor distribution work for utilities, industrial plants, mining sites, oil fields, commercial complexes, and rural electrification projects that need dependable step-down from medium voltage.

Customisation Options

Capacity, voltage ratio, vector group, winding material (copper or aluminium), tap changer type (off-load or on-load), and bushing configuration can all be adjusted to match project needs.

Ordering Information

  • Selling Unit: Single item
  • Packing: Wooden case, 280 × 200 × 250 cm, 5400 kg gross
  • Standards: IEC / GB; certified to IEC, CE, ISO9001/14001/45001, CQC, GOST, EAC

Product details in pictures

33kV 1250kVA & 1600kVA Three-Phase Outdoor Oil-Immersed Power Transformer (Copper) — detail 1
33kV 1250kVA & 1600kVA Three-Phase Outdoor Oil-Immersed Power Transformer (Copper) — detail 2
33kV 1250kVA & 1600kVA Three-Phase Outdoor Oil-Immersed Power Transformer (Copper) — detail 3
33kV 1250kVA & 1600kVA Three-Phase Outdoor Oil-Immersed Power Transformer (Copper) — detail 4

Frequently asked questions

What is the rated capacity of the 33kV 1250kVA & 1600kVA Three-Phase Outdoor Oil-Immersed Power Transformer (Copper)?

The rated capacity is 1250 kVA & 1600 kVA (range 15 kVA–31500 kVA), with an input voltage of 33 / 35 kV. Other ratings in the same series are quoted on request.

What are the main advantages of this oil-immersed transformer?

A fully sealed, corrugated-fin tank that keeps oil from oxidizing, requires no breathing, and cuts maintenance down; High efficiency delivered through low no-load loss and a low operating temperature; Rated for 20 to 30 years of service, holding up well in tough outdoor conditions.

Can this product be customised to my specification?

Capacity, voltage ratio, vector group, winding material (copper or aluminium), tap changer type (off-load or on-load), and bushing configuration can all be adjusted to match project needs.

Which standards and certifications apply?

Designed and tested to IEC / GB. Millenium production is certified to ISO 9001, ISO 14001 and ISO 45001, and the product family carries CE (ECM), UDEM attestation and an EAC declaration of conformity.

Quotation

Request a quotation for this product

Tell us the rating, voltages, frequency, quantity and destination. An engineer replies with a technical proposal, usually within one working day.

Include your country code, e.g. +1, +44, +966
Helpful details: rated power, HV/LV voltages, frequency, standard (IEC / ANSI / GOST), quantity, site conditions and delivery port.
Ask on WhatsApp