How to Test a Transformer: Field and Factory Testing Guide
Learn how to test a transformer step by step. Complete engineering guide covering winding resistance, turns ratio, insulation resistance, and HV testing.
Transformers guides
Sizing, selection, losses, vector groups and testing of distribution and power transformers.
Articles
Transformers Internal Components: Core, Windings & Insulation
Explore transformers internal components, from magnetic cores and windings to dielectric fluid and tap changers, built to rigorous IEC and IEEE standards.
Pad-Mounted Transformers for 60 Hz Markets: ANSI vs IEC Design
Compares ANSI and IEC pad-mounted transformer design rules for 60 Hz distribution networks, covering bushings, enclosures, BIL and standard kVA sizes.
Pole-Mounted Transformers for Rural Electrification
Single-phase vs three-phase pole-mounted transformers for rural feeders: sizing, CSP units, protection, SWER, and a worked village-load example.
Transformer Vector Groups: Dyn11, Yyn0, Dyn5 Explained
Understand transformer vector group notation, phase shift, why Dyn11 dominates distribution, and the rules for safe parallel operation.
Transformer Factory Acceptance Testing (FAT) Checklist
A practical checklist of routine, type and special transformer tests under IEC 60076-1, with acceptance tolerances and witnessing guidance.
Oil-Immersed vs Dry-Type Transformers: Which to Specify?
Compare oil-immersed and cast-resin dry-type transformers on cost, losses, fire safety, footprint and maintenance to choose the right type.
Transformer Losses and Total Cost of Ownership Explained
How no-load and load losses drive transformer running costs, and how to compare bids using a capitalisation formula and a worked TOC example.
How to Size a Distribution Transformer: kVA Calculation Guide
Step-by-step method to calculate distribution transformer kVA, from connected load and demand factor to standard IEC ratings and derating.
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