A distribution transformer should be specified from the actual network, load profile and installation site—not from a country label alone. For projects in Zimbabwe, Namibia, Mozambique, Algeria and other African markets, the utility requirements and site conditions can differ substantially. A clear RFQ helps suppliers compare like-for-like equipment and reduces avoidable revisions.
1. Define the electrical interface
State the primary and secondary voltages, system frequency, number of phases, grounding arrangement and required neutral connections. Include the single-line diagram and identify the upstream protection and downstream loads. Confirm the required vector group, impedance, tap range and tap-changing method with the project engineer or utility. Do not assume that a standard catalog configuration matches the local network.
2. Size the transformer from real demand
List the present connected load and expected demand at commissioning. Separate continuous loads from intermittent loads, and identify large motors, pumps, welding equipment, inverters or other loads with high starting current or harmonics. Include a realistic growth allowance rather than oversizing by habit. A load schedule and operating profile let the supplier explain the proposed kVA rating and any overload assumptions.
3. Choose construction for the installation
Compare oil-immersed and dry-type designs against the site and maintenance plan. For an outdoor pole, pad or ground-mounted installation, specify the mounting arrangement, clearances, enclosure and access for inspection. For an indoor location, describe the room, ventilation, fire requirements and maintenance access. Ask the supplier to list included accessories and protection devices so quotations can be compared on the same scope.
4. Describe the actual site environment
Include the design ambient temperature, altitude, humidity, dust or sand exposure, coastal salt, rainfall and any flood risk. State whether the unit will be exposed to direct sun, corrosive air, insects or restricted ventilation. These details influence cooling, insulation, coatings, enclosure design and the rating available at the site. If site data are not final, mark assumptions clearly and request confirmation before order.
5. Compare losses over the expected service life
Request guaranteed no-load and load losses at the specified rating and test conditions. Compare the values using the project's expected loading and operating hours; purchase price alone does not show the cost of energy losses over many years. Ask suppliers to state how tolerances are handled and which test documents will be provided. Avoid comparing efficiency claims that use different ratings or test bases.
6. Check standards and documents by project
Identify the applicable utility specification, tender documents and national requirements in the destination country. Request a compliance matrix showing each requirement, the offered value and any deviation. Before manufacturing, review the outline drawing, nameplate data, terminal arrangement, protection schedule, routine test scope, packing details and delivery documents. Country names alone are not a substitute for the project's approved specification.
7. Plan transport, installation and commissioning
Ask for dimensions, shipping weight, lifting points, packaging method and storage limits. Confirm the route from port or border to site, access for a crane or forklift, and who will unload and install the unit. Agree on inspection, commissioning tests, manuals, spare parts and warranty start conditions before shipment. These questions are especially useful when a project has a remote site or a long inland delivery route.
Distribution transformer RFQ checklist
Send the supplier the single-line diagram, voltage and frequency, phase and grounding details, load schedule, installation type, site conditions, applicable utility specification, required accessories, test documents, delivery destination and target date. Ask for a deviation list and a drawing approval schedule with the quotation.
Frequently asked questions
What information is needed to quote a distribution transformer?
At minimum, provide primary and secondary voltage, frequency, phase, kVA or load schedule, installation type, site conditions and destination. A single-line diagram and utility specification improve the accuracy of the offer.
Should I choose an oil-immersed or dry-type transformer?
Choose after reviewing the installation location, fire and ventilation requirements, maintenance plan, environmental conditions and project specification. The site and operating plan should determine the design.
How can I compare transformer quotations fairly?
Use the same electrical specification, accessories, guaranteed losses, test scope, delivery terms and warranty conditions for every bidder. Record deviations instead of comparing only the headline price.
For a project-specific offer, send Jinxing the load schedule, network data and delivery location through the request-a-quote page.