AUWiring

Transformers calculators

Calculate transformer current, kVA, sizing margin, voltage regulation, losses and tap-voltage outcomes from transformer and load data.

  • 5 calculators
  • Australian workflow
  • 230/400 V a.c. context

Transformers calculators project basis

Calculate transformer current, kVA, sizing margin, voltage regulation, losses and tap-voltage outcomes from transformer and load data. These calculators support Australian design, estimating, installation and verification preparation. Keep the circuit, equipment, route, supply arrangement and source data with the result before it is used in a project record.

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Confirm the nominal 230/400 V a.c. or project-specific voltage basis, 50 Hz context where applicable, phase arrangement, metric units, manufacturer information, DNSP or authority conditions and current project documents before applying a result.

Check entered values, supply arrangement, cable or equipment data, product limits, DNSP or authority conditions and review limits before using the result.

Records covered

  • Current and kVACalculate transformer kVA, primary current and secondary current. Inputs: kVA, phase arrangement, primary voltage and secondary voltage. Output: Transformer relationship estimate with product-data review.
  • Sizing worksheetEstimate required transformer kVA from entered load rows, demand factors and spare margin. Inputs: kW or kVA load rows, power factor, demand factors, spare margin and optional selected transformer size. Output: Transformer sizing worksheet that does not select a product.
  • Voltage regulationEstimate transformer voltage regulation from entered impedance and load assumptions. Inputs: R percent, X percent, load percentage, power factor direction, nominal voltage and optional review limit. Output: Voltage-regulation worksheet that does not set taps or decide network voltage conditions.
  • Transformer lossesEstimate transformer no-load, load and annual energy losses from entered loss data. Inputs: Transformer rating, load percentage, no-load loss, full-load loss, operating hours, energy rate and optional annual limit. Output: Loss worksheet that does not select a transformer or decide efficiency class.
  • Tap voltageEstimate secondary voltage after an entered transformer tap step adjustment. Inputs: Measured secondary voltage, tap step percentage, signed tap steps, target voltage and optional target band. Output: Tap-voltage worksheet that does not set a transformer tap or decide network voltage conditions.

Review before applying

Transformers calculator results are preparation records. Keep entered values beside current Australian requirements, DNSP or authority conditions, manufacturer information and project documents before applying a result.

Recheck the selected calculator whenever the supply arrangement, equipment data, route length, tariff basis, measurement method or project document set changes.