Transformer Secondary Voltage Calculator

Calculate secondary voltage for single phase and three phase transformers using turns ratio

Transformer Secondary Voltage Calculator

Compliant with IEEE C57.12.00 Standards

Results:

Secondary Voltage: 0.00 V

Turns Ratio: 0.00

Voltage Ratio: 0.00

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How to Use Transformer Secondary Voltage Calculator

Single Phase Transformer

  1. Select "Single Phase" from transformer type
  2. Enter the primary voltage (line-to-neutral or line-to-line)
  3. Input the number of primary winding turns
  4. Enter the number of secondary winding turns
  5. Click "Calculate" to get secondary voltage
  6. Review the turns ratio and voltage ratio results

Three Phase Transformer

  1. Select "Three Phase" from transformer type
  2. Enter the primary line-to-line voltage
  3. Input the primary winding turns per phase
  4. Enter the secondary winding turns per phase
  5. Click "Calculate" for secondary line-to-line voltage
  6. Analyze the transformation ratio

Important Notes

  1. Ensure turns count accuracy for precise calculations
  2. Use nameplate voltage values when available
  3. Consider voltage regulation under load conditions
  4. Account for transformer losses in practical applications
  5. Verify results with transformer specifications

How to Calculate Transformer Secondary Voltage

Basic Principle

Transformer secondary voltage is determined by the turns ratio and primary voltage according to Faraday's law of electromagnetic induction.

  • Voltage is proportional to the number of turns
  • Same magnetic flux links both windings
  • Ideal transformer has no losses

Step-by-Step Calculation

  • Step 1: Identify primary voltage (Vp)
  • Step 2: Count primary turns (Np)
  • Step 3: Count secondary turns (Ns)
  • Step 4: Apply formula: Vs = Vp × (Ns/Np)
  • Step 5: Calculate turns ratio = Np/Ns

Real-Life Calculation Example

Single Phase Step-Down Transformer:

Given:

  • Primary Voltage (Vp) = 480V
  • Primary Turns (Np) = 1000 turns
  • Secondary Turns (Ns) = 500 turns

Calculation:

Vs = Vp × (Ns/Np)

Vs = 480V × (500/1000)

Vs = 480V × 0.5

Vs = 240V

Turns Ratio: 1000:500 = 2:1

Voltage Ratio: 480:240 = 2:1

This is a typical step-down transformer reducing 480V to 240V with a 2:1 turns ratio.

Transformer Voltage Formulas

Secondary Voltage:
Vs = Vp × (Ns/Np)

Turns Ratio:
a = Np/Ns

Voltage Ratio:
Vp/Vs = Np/Ns

Where:

Vs = Secondary Voltage (V)

Vp = Primary Voltage (V)

Ns = Secondary Turns

Np = Primary Turns

a = Turns Ratio

Three Phase Example

Three Phase Distribution Transformer:

Given:

  • Primary Voltage = 13,800V (line-to-line)
  • Primary Turns per phase = 2760 turns
  • Secondary Turns per phase = 120 turns

Calculation:

Vs = 13,800V × (120/2760)

Vs = 13,800V × 0.0435

Vs = 600V (line-to-line)

Turns Ratio: 2760:120 = 23:1

Common distribution transformer stepping down 13.8kV to 600V.

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