Distribution Transformer

Transformer Substation

Distribution Transformer

A distribution transformer is the last voltage step between the network and your equipment — bringing distribution voltage down to the 400 V-class level that switchboards and machines actually consume. It is the workhorse of every electrical network: pole-mounted along rural feeders, pad-mounted in commercial districts, dry-type indoors in towers and plants.

We build distribution transformers across the standard rating range in both oil-immersed and dry-type formats, wound to your exact voltage ratio, impedance and vector group — not assembled from a fixed catalogue. Behind this site stands a factory operating since 2010 with more than 4,000 delivered projects, and every transformer ships with its routine test results.

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Key Specifications & Options

The configuration below reflects the options we build to order for distribution transformers. Every parameter can be adjusted to match your drawings and site conditions — send us your requirements and our engineers will confirm what applies to your project.

ParameterOptions / Typical Range
Rated power10–2,500 kVA standard range; 3,150 kVA and above engineered per project
FormatOil-immersed (pole, pad or compact substation) or dry-type for indoor switchrooms
Voltage ratio3.6–36 kV distribution class down to 400 V-class low voltage; custom ratios wound to order
Vector groupDyn11 common; YNd, Yzn and other configurations available
CoolingONAN / ONAF for oil units; AN / AF for dry units
Core & lossesConventional CRGO or low-loss amorphous core; DOE 10 CFR 431 / EU Ecodesign compliant levels for regulated markets
TappingOff-circuit ±2×2.5% typical; on-load tap changer by arrangement
StandardsIEC 60076 series or IEEE C57 series to the destination market

Frequently Asked Questions

How do I size a distribution transformer for my load?

Start from the connected load and its diversity, then allow for future growth and motor starting duty — a unit loaded around 60–80% of rating at peak usually gives the best loss-versus-capital balance. Send your load list and we will propose the rating, cooling and loss evaluation for your tariff, so the choice is calculated rather than guessed.

Which format — pole, pad or dry-type — suits my site?

Overhead feeders point to pole mounts; underground networks and space-constrained compounds point to pads; indoor electrical rooms and fire-sensitive buildings point to dry-type. Many projects mix all three. Describe the site and we will match formats section by section.

Is an amorphous core worth the extra cost?

Where the transformer stays energised around the clock — most distribution duty — the no-load loss saving compounds continuously and typically repays the premium within a few years. For intermittently loaded or backup positions, conventional CRGO often remains the economical call. We quote both cores with the loss figures so you can decide on numbers.

Can you supply routine test certificates with delivery?

Yes — every unit passes ratio, winding resistance, no-load and load loss, and withstand tests before dispatch, and the results travel with the shipment. Type-test arrangements such as temperature-rise or sound-level verification can be added where the contract requires them.

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