Incomplete RFQs do not always produce a visibly incomplete quotation. More often, each bidder quietly fills the gaps with different assumptions. The prices then look comparable while the proposed transformers are not.
The one-page RFQ brief
Type, quantity, phases, frequency and governing standard.
Rated power, winding voltages, connection, taps, impedance and insulation.
Indoor/outdoor, ambient, altitude, pollution, enclosure, noise and fire conditions.
Destination, delivery target, Incoterm, documents, inspection and site scope.
Attach the documents that remove assumptions
A single-line diagram shows winding relationships, system earthing and switching boundaries more clearly than a paragraph. Add the data schedule, site-condition sheet, accessories, terminal drawing and inspection requirements. For a replacement, include verified dimensions and photographs—but do not use photographs for critical measurements.
What may remain provisional?
Early enquiries can precede the final network study or civil design when provisional values are identified and linked to a freeze date. The bidder should state the cost and schedule impact if those inputs move outside an agreed range.
- Acceptable early: estimated transport date, preliminary foundation loads and final monitoring point list.
- Risky to leave open: winding voltages, frequency, insulation level, vector group, fault duty and transport limits.
Compare bids with a compliance table
Ask every bidder to return the same schedule and list deviations clause by clause. Compare losses, impedance, temperature rise, dimensions, masses, accessories, tests, exclusions and delivery basis—not only MVA and total price.
Minimum starting point: voltage, capacity, frequency, phases, application, environment, quantity, destination and delivery period—plus a single-line diagram whenever available.