An in-depth engineering program — 26 chapters taking you from a customer specification to a complete power/distribution transformer design — with worked calculations, diagrams, ten interactive 3D models and a live design calculator. All of it included with Yearly Access.
The knowledge of 3–5 years as a transformer design engineer, structured: four levels, ~400 guided hours, five capstone design projects with real acceptance criteria — Level 1 is free to start. Full Levels 1–4, capstone review and a course completion record require Yearly Access.
Start the track →One payment unlocks the entire learning platform:
Bulk seats, engineer-reviewed capstones and priority review for your manufacturer, utility or EPC — with volume pricing.
The unified experience — all 26 chapters with the 3D models and the design calculator embedded inline, plus a new engineering data appendix. Fundamentals to after-sales, theory you can rotate and recalculate.
Open the masterclass →Rotate, zoom and explode a transformer in 3D — oil-immersed and cast-resin modes, toggle components, and click any part to learn what it does.
Explore the 3D model →Interactive learning and engineering tools — included with Yearly Access.
An interactive masterclass — learn transformers the way they're actually built.
Explore a 100 MVA 132/33 kV power transformer in interactive 3D.
See how the core is built and the coils are assembled, step by step.
Live IEC 60076 sizing suite — distribution / power / cast-resin, three modes.
From core to customer — a complete construction walkthrough.
Design a transformer to a chosen country's grid and standards.
The full course — 26 chapters with figures, tables and equations, plus a data lab.
A 400/220 kV giant in interactive 3D — radiators, conservator and OLTC.
See inside an on-load tap-changer — diverter, selector and drive in 3D.
RIP and OIP bushings in an interactive 3D cutaway.
3-limb vs 5-limb vs shell-form cores, compared in interactive 3D.
The course, in the order a real design is built. This week's spotlight is highlighted — jump straight to that section.
The core calculations every transformer designer reaches for.
E = 4.44 · f · N · Bₘ · Aₗf = frequency (Hz), N = turns, Bₘ = peak flux density (T), Aₗ = net core area (m²)Tₕ = 1 / (4.44 · f · Bₘ · Aₗ)Multiply by winding voltage to get the number of turnsEₕ ≈ K · √(kVA)K ≈ 0.3–0.45 for distribution, 0.6–1.1 for power transformersa = I / δI = winding current (A), δ = current density (A/mm², typ. 2–3.5)Aₙ ≥ Σ(N · a) / KₙKₙ = window space factor (allows for insulation & formers)η = P↷ / (P↷ + P + Pↄↅ)Core loss is constant; copper loss varies with load²Enter a rating and watch a first-pass design fall out — volts-per-turn, core area, turns, currents and conductor sizes. Live, in your browser.
Engineering course authored for TransformerPath. The calculator gives a first-pass estimate using simplified formulas — always design to the applicable IEC 60076 / ANSI C57 standard.