Transformer technical guides and procurement resources

Technical Resources

Guides for Transformer Buyers
and Engineers

Practical references covering procurement, specifications, testing, and selection — written for EPC contractors, utility teams, and industrial buyers.

Free Resources

7 Technical Guides

Procurement


Transformer RFQ Checklist

Every spec a factory needs to give you an accurate quotation — from rated capacity and voltage through vector group, cooling type, and test requirements.

  • Minimum vs full specification table
  • IEC / ANSI / GB standard selection
  • FAT and test report requirements
Read Guide

How to Source from China

Step-by-step guide for international buyers: factory vetting, specifications, lead times, documentation, and export process.

  • Factory audit checklist
  • Export documentation guide
  • Common pitfalls to avoid
Read Guide

Factory Acceptance Test (FAT) Checklist

What to witness before shipment: visual inspection, nameplate verification, winding resistance, ratio, impedance, oil tests, and third-party options.

  • Full routine test checklist
  • SGS / BV / Intertek options
  • Documents to collect post-FAT
Read Guide

Technical Reference


IEC vs ANSI Standards

Key differences between IEC 60076 and ANSI/IEEE C57 — ratings, impedance, vector groups, and which standard to specify for your project location.

  • Side-by-side comparison table
  • Region-by-region guide
  • GB/T Chinese standard explained
Read Guide

ONAN vs ONAF Cooling

What the IEC cooling codes mean, when natural cooling is sufficient, when to specify forced-air, and high-ambient derating rules.

  • ONAN / ONAF / OFAF comparison
  • Middle East & tropical climate notes
  • IEC letter-code decoder
Read Guide

Oil-Immersed vs Dry-Type

Full comparison table and use-case decision guide: indoor/outdoor, fire safety, capacity range, cost, and real-world application examples.

  • 11-row comparison table
  • Data center, high-rise, utility examples
  • Decision framework by use case
Read Guide

Transformer Basics

Core principles: how transformers work, key parameters, loss types, and the fundamentals every buyer and engineer should know.

  • How transformers work
  • Key nameplate parameters
  • Loss types and efficiency
Read Guide

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