Power Transformer Simulator

Power transformers sit at the center of every distribution system, and their behavior under varying load, ambient temperature, tap position, and fault conditions directly affects system reliability, efficiency, and protection coordination. This simulator builds an interactive transformer model: enter nameplate kVA (25 kVA–10 MVA), percentage impedance, no-load and full-load losses, then adjust load percentage, power factor, tap position, and ambient temperature to see secondary voltage, efficiency, losses, and thermal loading update in real time. The Loading tab plots efficiency vs. load curve and a loss breakdown (core losses vs. copper losses). The Thermal tab models temperature rise under sustained and overload conditions, including ONAN base rating versus active cooling stage. The Fault tab explores through-fault current magnitude and short-circuit withstand. A Scenarios tab provides preset transformer configurations from small dry-type distribution units to large liquid-filled substation transformers. A Quiz tab reinforces transformer theory. Secondary voltage options span 208 V through 23,000 V; primary voltage from 208 V through 69 kV.

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A live look at the app you'll launch — every control on the left drives the visualizations on the right in real time.

• 01Explain the two components of transformer losses — core (no-load) losses and copper (load) losses — and identify at what load level efficiency is maximized
• 02Calculate voltage regulation for a transformer at given impedance, load, and power factor
• 03Explain how tap changer position affects secondary voltage and when DETC versus OLTC are used
• 04Describe transformer thermal loading and explain why the ONAN rating is the most conservative nameplate value
• 05Calculate through-fault current magnitude using transformer impedance and explain its role in protection coordination
• 06Predict the effect of ambient temperature on transformer loading capacity and top-oil temperature rise