Datasheet and ratings
Identify the proposed model and the electrical ratings that the document must cover.
Request for your projectHEAKOR / Buyer knowledge
Transformer buying,
made clearer.
Practical transformer buying guides for the decisions before a purchase.
Prepare the specification, check document scope and compare proposals on the same basis.
Choose your next task
What are you working on?
01 ↗
Choose a product family
Compare the main transformer arrangements.
02 ↗Prepare your specification
Collect the electrical, site and supply requirements.
03 ↗Send a complete RFQ
Use a practical checklist before requesting prices.
04 ↗Check certificate scope
Match the certificate to the model and rating.
05 ↗Plan a replacement
Record the existing equipment and site constraints.
06 ↗Compare quotations
Check technical scope, documents and commercial terms.
Start here / Procurement essentials
A better enquiry makes a better starting point.
Bring the electrical ratings, site conditions, destination, quantity and required documents together before requesting a quotation.
Open the transformer RFQ checklist- 01Identify the equipment and application
- 02Define electrical and site requirements
- 03List documents and approval needs
- 04Clarify quantity, destination and timing
The guide library
Read. Check. Prepare.
Use these guides to prepare questions for your technical team and supplier. Project documents govern final selection.
14 Oct 2026
Dry-Type Transformer Busway Interface: A Drawing Approval Checklist
A dry-type transformer busway interface needs coordinated drawings before fabrication. Review terminal geometry, conductor mapping, supports, enclosure bound...
Read the guide
13 Oct 2026
50 Hz vs 60 Hz Dry-Type Transformers: What Buyers Must Confirm
50 Hz vs 60 Hz dry-type transformers: check the offered design, full voltages, continuous output, thermal conditions and auxiliaries. Resolve rating and appr...
Read the guide
13 Oct 2026
Dry-Type Transformer Seismic Qualification: Anchorage Evidence
Dry-type transformer seismic qualification: review the exact model, mounting configuration and qualification limits, then confirm project anchorage evidence ...
Read the guide
13 Oct 2026
K-Rated vs Harmonic-Mitigating Transformers: Buyer Evidence
K-rated vs harmonic-mitigating transformers: compare thermal-duty and harmonic-performance evidence separately. Define the load, operating cases and acceptan...
Read the guide
12 Oct 2026
Dry-Type Transformer Parallel Operation: Buyer Review
Dry-type transformer parallel operation needs a documented compatibility review. Compare existing and proposed units, ratios, taps, impedance, operating mode...
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12 Oct 2026
Dry-Type Transformer Inrush Data: Protection-Coordination Handover
Dry-type transformer inrush data should define the current, energization conditions and evidence for the proposed unit. Use this EPC checklist to prepare a t...
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12 Oct 2026
Pad-Mounted Transformer Spare Bushings: Interface Review
Pad-mounted transformer spare bushing selection requires a documented interface match. Review component identification, cable-side and tank-side drawings, el...
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11 Oct 2026
Dry-Type Transformer Wood Packaging: U.S. Pre-Export Checks
Dry-type transformer wood packaging needs more than a plywood description. Review solid timber, ISPM 15 marks, provider traceability and final packing eviden...
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11 Oct 2026
Dry-Type Transformer Classes: C, E and F Evidence Checklist
Dry-type transformer classes describe climate, environment and fire behaviour separately. Distinguish C, E and F codes from thermal class and IP protection, ...
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11 Oct 2026
Dry-Type Transformer Partial Discharge: Test Acceptance
Dry-type transformer partial discharge results need a clear acceptance basis. Review the procedure, calibration, interference and voltage-time record before ...
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10 Oct 2026
Transformer Loss Capitalization: How to Evaluate Bids
Transformer loss capitalization combines comparable bid prices with evaluated losses. Use approved A/B factors, consistent loss guarantees and a worked examp...
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10 Oct 2026
Dry-Type Transformer Temperature Monitoring: Interface Checklist
Dry-type transformer temperature monitoring needs defined sensor, supply and signal interfaces. Coordinate alarm and trip outputs, fan controls, BMS data and...
Read the guideCompare quotations
Put the proposals
on the same basis.
A lower price is only comparable when the proposed equipment and supply scope match. Record differences and resolve them before ordering.
Equipment
Compare capacity, voltages, phase, frequency, impedance, cooling and installation requirements against the same specification.
Documents and testing
Identify the proposed model, drawings, required test reports and any mandatory approvals. Check what is included and excluded.
Commercial scope
Compare quantity, delivery term and named place, packaging, transport, lead time, payment and warranty in writing.
Project documents
The right document. For the right model.
Tell us which documents your project needs. Availability and applicable scope are confirmed for the proposed model and configuration.
Outline and connection drawings
State the installation, cable-entry and clearance requirements you need to check.
Request for your projectTest and approval documents
Name the required tests, standard or approval, and the model or configuration concerned.
Request for your projectRequest documents for your proposed configuration
Include the model or product type, capacity, voltages, frequency and destination. Ask for the report number, date and test scope so you can check that the documents match the proposed configuration. An individual report does not establish certification for every model or destination.
When reviewing a document, match the legal entity, model, rating, applicable scope and issue date to your proposed equipment.
Read the certificate-scope guideOpen the document centreYour project / next step
Good decisions start with clear requirements.
Send the details you have. We can start the conversation while the remaining requirements are being confirmed.
Discuss your project