Cast-Resin Dry-Type Transformers

250–1250kVA Three-Phase Dry-Type Step-Down Transformer (10–13.8kV / 400V, Fireproof)

Available across a 250kVA to 1250kVA range, this three-phase dry-type step-down transformer brings 10kV, 11kV or 13.8kV down to 400V for indoor distribution…

Technical specifications

Technical specifications of 250–1250kVA Three-Phase Dry-Type Step-Down Transformer (10–13.8kV / 400V, Fireproof)
ParameterValue
Product TypeEpoxy Resin Cast Dry-Type Step-Down Transformer
Rated Capacity250 / 400 / 630 / 1000 / 1250 kVA
Input Voltage10 kV / 11 kV / 13.8 kV
Output Voltage400 V
Frequency50 / 60 Hz
PhaseThree
Winding MaterialCopper / Aluminium
Vector GroupDyn11 / Yyn0
InsulationEpoxy Resin Cast
FeatureFireproof, Explosion-proof
StandardIEC 60076
CertificationISO9001, ISO14001, CE, CQC

These specifications reflect the product data provided to us. Actual dimensions, materials, colors and packaging depend on the confirmed sample and final order agreement.

Why buyers choose it

  • Spans a broad capacity range — 250 / 400 / 630 / 1000 / 1250 kVA
  • Accepts multiple input voltages: 10kV, 11kV or 13.8kV, stepping down to 400V
  • Resin-cast windings deliver fireproof, explosion-proof, oil-free performance
  • Windings available in copper or aluminium, in Dyn11 / Yyn0 vector groups
  • Certified under IEC 60076, ISO9001, ISO14001, CE and CQC

Standards & certification

Designed and tested to IEC 60076. 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

Available across a 250kVA to 1250kVA range, this three-phase dry-type step-down transformer brings 10kV, 11kV or 13.8kV down to 400V for indoor distribution work. Its epoxy-resin cast HV windings give it fireproof and explosion-proof properties, along with oil-free, low-maintenance running at 50Hz or 60Hz.

Design & Construction

  • HV winding columns, resin-cast, are mounted on a rollered steel base frame
  • HV bushings and tap links carry color-coded phase markers
  • A digital controller keeps continuous watch on winding temperature
  • LV busbar terminal boxes include ventilation
  • Open-type dry construction keeps the unit oil-free and lowers fire risk

Applications

Well suited to indoor switchrooms, power plants, commercial buildings, hospitals and industrial sites where fireproof, oil-free step-down transformation is needed.

Customisation Options

Capacity, voltage ratio, vector group, protective enclosure and temperature controller can be tailored to the project, with copper or aluminium windings offered on request.

Ordering Information

When ordering, please confirm the rated capacity, primary/secondary voltage, frequency, vector group and the standard that applies.

Product details in pictures

250–1250kVA Three-Phase Dry-Type Step-Down Transformer (10–13.8kV / 400V, Fireproof) — detail 1
250–1250kVA Three-Phase Dry-Type Step-Down Transformer (10–13.8kV / 400V, Fireproof) — detail 2
250–1250kVA Three-Phase Dry-Type Step-Down Transformer (10–13.8kV / 400V, Fireproof) — detail 3
250–1250kVA Three-Phase Dry-Type Step-Down Transformer (10–13.8kV / 400V, Fireproof) — detail 4

Frequently asked questions

What is the rated capacity of the 250–1250kVA Three-Phase Dry-Type Step-Down Transformer (10–13.8kV / 400V, Fireproof)?

The rated capacity is 250 / 400 / 630 / 1000 / 1250 kVA, with an input voltage of 10 kV / 11 kV / 13.8 kV. Other ratings in the same series are quoted on request.

What are the main advantages of this dry-type transformer?

Spans a broad capacity range — 250 / 400 / 630 / 1000 / 1250 kVA; Accepts multiple input voltages: 10kV, 11kV or 13.8kV, stepping down to 400V; Resin-cast windings deliver fireproof, explosion-proof, oil-free performance.

Can this product be customised to my specification?

Capacity, voltage ratio, vector group, protective enclosure and temperature controller can be tailored to the project, with copper or aluminium windings offered on request.

Which standards and certifications apply?

Designed and tested to IEC 60076. 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

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