Here, using this Transformer Calculator, you can calculate Full Load Current, Turns ratio, Winding Resistance, and Losses. Here, you can calculate for both Single Phase and Three Phase Transformers. This calculator helps you to calculate the size of the transformer and its design.

Transformer Calculator

## Transformer Calculator

### How to Use This Calculator?

To use the above "Transformer Calculator," follow the below steps:

1. Select the voltage input type: First of all, Choose between "Single Phase,"(for single phase transformer), "Three Phase L-L,"(for 3 phase delta connected transformer), or "Three Phase L-N"(for 3 phase star connected transformer) by clicking on the respective radio button.

2. Enter Transformer Capacity: Input the transformer capacity value in the first input box labeled "Enter Transformer Capacity." Also, Choose the appropriate unit (kVA, VA, MVA) from the dropdown menu next to the capacity input box.

3. Enter Primary Voltage: Input the primary voltage value in the second input box labeled "Enter Primary Voltage." Select the corresponding unit (V, kV, MV) from the dropdown menu next to the primary voltage input box.

4. Enter Secondary Voltage: Input the secondary voltage value in the third input box labeled "Enter Secondary Voltage." Choose the appropriate unit (V, kV, MV) from the dropdown menu next to the secondary voltage input box.

5. (Optional) Enter Efficiency % (E): If you know the efficiency percentage, you can input it in the fourth input box labeled "(Optional) Enter Efficiency % (E)". The efficiency value is optional, but if provided, it will be used for calculations.

6. Calculate: Click the "Calculate" button at the bottom of the calculator to compute the results based on the provided inputs.

7. View Results with 100% Efficiency: After clicking "Calculate," the calculator will display the results assuming 100% efficiency. The results include "Turns Ratio (TR)," "Primary Winding Resistance," "Secondary Winding Resistance," "Primary Full Load Current (IS)," and "Secondary Full Load Current (IL)" for 100% efficiency.

8. View Results with Specified Efficiency: The calculator will also provide results for the specified efficiency percentage (if provided). The results include "Turns Ratio (TR)," "Primary Winding Resistance," "Secondary Winding Resistance," "Transformer Output," "Total Loss Occur," "Primary Full Load Current (IS)," and "Secondary Full Load Current (IL)" for the specified efficiency.

9. Reset the Calculator: If you want to start over and clear all the input fields and results, you can click the "Reset" button.

Remember to provide the necessary inputs, such as the transformer capacity and primary and secondary voltages, before clicking the "Calculate" button to get the appropriate results.

### Formulas

Here are the formulas used in the above calculator.

Transformer Capacity Conversion:

Conversion formula for transformer capacity into SI unit (VA):

If the capacity unit is 'kVA', then capacity is converted into VA(volt-ampere) by multiplying with 1000

If the capacity unit is 'MVA', then capacity is converted into VA(volt-ampere) by multiplying with 1000000

Voltage Conversion:

Conversion formula for primary and secondary voltages into SI unit (V):

If the voltage unit is 'kV', then the voltage is converted into Volt(V) by multiplying with 1000

If the voltage unit is 'MV', then the voltage is converted into Volt(V) by multiplying with 1000000

Current Conversion:

Conversion formula for primary and secondary Current into SI unit (A):

If the voltage unit is 'kA', then the current is converted into Ampere(A) by multiplying with 1000

If the voltage unit is 'mA', then the voltage is converted into Ampere(A) by dividing with 1000

Primary Current Calculation (100% Efficiency):

For Single Phase connection type: primary current = capacity / primary voltage
For Three Phase L-L connection type: primary current = capacity / (1.732 * primary voltage)
For Three Phase L-N connection type: primary current = capacity / (3 * primary voltage)

Secondary Current Calculation (100% Efficiency):

For Single Phase connection type: secondary current = capacity / secondary voltage
For Three Phase L-L connection type: secondary current = capacity / (1.732 * secondary voltage)
For Three Phase L-N connection type: secondary current = capacity / (3 * secondary voltage)

**At 100% efficiency or ideal transformer have Zero resistance in both primary and secondary winding**

Turns Ratio is the same for 100% Efficiency and Specified Efficiency:

Turns Ratio = primary voltage / secondary voltage

Transformer Output at Specified Efficiency:

Transformer Output = Transformer Capacity * (efficiency / 100)

Total Loss Calculation (at Specified Efficiency):

Total Loss = Transformer Input or Capacity(KVA Rating) - Transformer Output

Primary Current Calculation (at Specified Efficiency):

For Single Phase connection type: primary current = capacity / primary voltage
For Three Phase L-L connection type: primary current = capacity / (1.732 * primary voltage)
For Three Phase L-N connection type: primary current = capacity / (3 * primary voltage)

Secondary Current Calculation (at Specified Efficiency):

For Single Phase connection type: secondary current = Transformer Output / secondary voltage
For Three Phase L-L connection type: secondary current = Transformer Output / (1.732 * secondary voltage)
For Three Phase L-N connection type: secondary current = Transformer Output / (3 * secondary voltage)

Resistance Calculation (at Specified Efficiency):

Primary resistance = primary voltage / primary current
Secondary resistance = secondary voltage / secondary current

**Remember that the actual winding resistance depends upon the design of the transformer. Here we just calculated the resistance based on theoretical values to give you the concept of winding resistance**

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Transformer Calculator (Resistance, Turns Ratio, Current, Losses) Reviewed by Author on August 04, 2023 Rating: 5