Enter your transformer's Phase Configuration, KVA Rating, Voltage, Full Load Current, Iron Loss, Copper Loss, and Load Fraction to calculate your Transformer Efficiency, along with Total Losses, Copper Loss at Load, Output Power, and Input Power.
Transformer Efficiency
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Total Losses
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Copper Loss at Load
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Output Power
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Input Power
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Transformer efficiency is the ratio of output power to input power, expressed as a percentage. Higher efficiency means less energy loss as heat, reducing operating costs and environmental impact.
Iron losses (core losses) are constant losses due to hysteresis and eddy currents in the core material. Copper losses are variable losses due to resistance in the windings that increase with the square of the load current.
Transformer efficiency varies with load. It's typically highest at around 50-75% of full load where the balance between constant iron losses and variable copper losses is optimal.
No-load loss (iron loss) occurs even when the transformer is energized but not loaded. Full-load loss includes both iron losses and copper losses at maximum rated current.
Iron losses remain constant at all loads. Copper losses vary with the square of the load fraction (load²). Total losses = Iron losses + (Copper losses × load fraction²).
Key factors include core material quality, winding resistance, load factor, temperature, and transformer design. Better materials and optimized design improve efficiency.
Maximum efficiency occurs when copper losses equal iron losses. This typically happens at 50-75% of full load, depending on the transformer's loss characteristics.
Single-phase and three-phase transformers have different power calculation methods. Three-phase systems are more efficient for high-power applications and have different current-voltage relationships.