Dry-Type Transformer for Power Distribution

This page covers project selection and quotation requirements. Ratings, construction, enclosure, compliance and supply scope must be confirmed for the proposed model.

What information is needed to select a dry-type transformer?

Start with the required capacity, primary and secondary voltages, phase and frequency. Capacity alone is not enough to identify a suitable transformer. Include the load characteristics and site conditions so the proposed configuration can be checked against the project specification.

• Electrical system: rated capacity in kVA or MVA, primary and secondary voltages, phase and frequency.
• Design requirements: vector group, impedance, tapping requirements, insulation levels and temperature-rise limits, where specified.
• Installation: indoor or outdoor location, enclosure protection, ambient temperature, altitude, ventilation, dust and humidity.
• Project requirements: applicable standards, losses or efficiency limits, noise limits, required tests and documentation.

Dry-type transformer questions and answers

Where can a dry-type transformer be used?

Dry-type designs may be considered for commercial buildings, industrial facilities and other power distribution projects where the installation requirements call for equipment without insulating oil. Suitability depends on the specific transformer design, load, ventilation, enclosure and local installation requirements.

Can a dry-type transformer be installed outdoors?

Outdoor suitability must be confirmed for the complete transformer and enclosure configuration. Do not assume that an open transformer is suitable for rain, condensation or dust exposure. State the outdoor conditions and required enclosure protection in the enquiry.

What is the difference between dry-type and oil-immersed transformers?

The main distinction is the insulation and cooling arrangement: a dry-type transformer does not use insulating oil, while an oil-immersed transformer uses oil as part of its insulation and cooling system. The choice should follow the project's electrical, installation and maintenance requirements.

Which standards and certificates should I specify?

Provide the required standard number and edition, destination-country requirements and any mandatory certification or project approval. Compliance must be checked for the proposed model and documented scope; a product category name does not establish certification.

What should I provide for a replacement transformer?

Include the existing nameplate details, available drawings and the required electrical ratings. Describe changes to the load, connection arrangement or installation space, and identify access and lifting restrictions. Matching the original kVA rating alone does not confirm replacement compatibility.

How do I request a price and delivery schedule?

Send the core electrical requirements, quantity, destination and requested delivery date. Price and delivery need confirmation against the final technical specification and supply scope. Identify required drawings, test reports and other documents when requesting a quotation.

Which technical documents should I request?

Ask for the proposed model datasheet and an outline drawing showing overall dimensions, terminals, mounting and access requirements. Check that the documents identify the same capacity, voltages, connection and enclosure as the quotation.

List the required tests, reports and acceptance criteria in the enquiry. Where certification or third-party approval is mandatory, request evidence with a matching model and scope. Availability and document issue dates must be confirmed for the proposed equipment.

Request a dry-type transformer quotation from HEAKOR

Use the enquiry form to share your company name, project location, application, procurement stage and required capacity, voltages, phase and frequency. Mention whether you have a technical specification, single-line diagram or replacement nameplate available. If details are still being confirmed, mark them as TBC.

Submit your dry-type transformer requirements

For the category overview, visit HEAKOR dry-type transformers.

Before requesting a quotation, use the transformer RFQ checklist to organize your specifications and open questions. The project requirements guide explains how to define the requested equipment and document scope.