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# Transformer Calculator

Select the parameters and enter their values. The calculator will immediately calculate voltage, current value, and other transformer-related terms.

Transformer Phase

Transformer Rating

I Want to Find

Supervised/Unsupervised Location

% Impedance Without( % sign)

Primary Voltage

Secondary Voltage

Primary Winding

Secondary Winding

Primary Current

Secondary Current

KVA

Volts

Amperes

co-efficient of eddy current

Thickness of the sheet

Maximum Flux Density

Frequency

Hysteresis Constant

Number of Turns

Table of Content

 1 What is priceeight Class? 2 priceeight Class Chart: 3 How to Calculate priceeight Density (Step by Step): 4 Factors that Determine priceeight Classification: 5 What is the purpose of priceeight Class? 6 Are mentioned priceeight Classes verified by the officials? 7 Are priceeight Classes of UPS and FedEx same?

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The transformer calculator finds the primary and secondary full load currents (Amps) and voltages of single and 3-phase transformers. It can function to make calculations for both ideal and real transformers and identify their types based on the turns ratio.

Moreover, the tool also helps you estimate EMF & different transmission losses including

• Eddy Current Loss
• Total Iron Loss
• Total Copper Loss
• Hysteresis Loss

## What Is A Transformer?

A transformer operates to deliver current from one AC circuit to one or more AC circuits. This component works according to Faradayâ€™s Law of Electromagnetic Induction to either step up or down the voltage.

## Transformer Formulas:

Transformer calculator considers the following equations that help you analyze a mathematical model of the transformer.

### Voltage Equation:

$$V_p = N_p / N_s Ã— V_s$$

Where:

• $$V_p$$ = Primary Coil Voltage
• $$V_s$$ = Secondary Coil Voltage
• $$n_p$$ = Number of Turns on Primary Coil
• $$n_s$$ = Number of Turns on Secondary Coil

### Equivalent Current Equation:

$$I_s=I_p*\dfrac{N_p}{N_s}$$

#### Single-Phase:

$$Full-Load Current (Amps)= kVA Ã— 1000 / V$$

#### Three-Phase:

$$Full-Load Current (Amps) = kVA Ã— 1000 / (1.732 Ã— V)$$

### Turns Ratio:

$$Turns Ratio = N_1 / N_2 = V_1 / V_2 = I_2 / I_1$$

## Example:

Consider a single phase transformer of size about 56kVA. Its primary voltage is 350 volts and secondary voltage is almost 120 volts. Considering the transformer to be the ideal one, calculate the turns ratio and full load current range.

### Solution:

As the transformer is supposed to be ideal one:

Turns Ratio = N1 / N2 = V1 / V2 = (350 / 76) = 4.60

#### Primary:

$$Primary Full-Load Current (Amps)= kVA Ã— 1000 / V$$

$$Primary Full-Load Current (Amps)= 56 Ã— 1000 / 350$$

$$Primary Full-Load Current (Amps)= 56 Ã— 2.857$$

$$Primary Full-Load Current (Amps)= 159.992$$

#### Secondary:

$$Secondary Full-Load Current (Amps)= kVA Ã— 1000 / V$$

$$Secondary Full-Load Current (Amps)= 56 Ã— 1000 / 120$$

$$Secondary Full-Load Current (Amps)= 56 Ã— 8.333$$

$$Secondary Full-Load Current (Amps)= 466.648$$

Related: Do not forget to calculate Voltage Drops and Amperage across different circuits while analyzing the functionality of a transformer.

## How To Size a Transformer?

To size a transformer effectively, you can use the given equation. All you need to simply multiply the amperes with the secondary output voltage.

Mathematically:
(VA) = Secondary Voltage * Required Current

Important: We do not recommend loading a transformer above 80% of its KVA rating. To find the minimum KVA rating needed, divide the calculated KVA by a factor of 0.8. All values should be reviewed and confirmed by an electrician or electrical engineer.

## People Also Ask (Transformer Queries)

### Why Is Rectifier Used In Transformers?

In a transformer, a rectifier behaves as a device that converts the AC into a high DC. This direct amperage is further used for different chemical processes, including

• Chlorine production
• Copper production
• Aluminum production

### What Is the Primary Difference Between kW and kVA?

Power factor is the basic difference between kW and kVA. Where the kW is the power of the real transformer, the kVA is considered the power factor of the apparent transformer.

### How Many Amps Can a 150 kVA Transformer Handle?

A 150 Kva transformer can handle primary voltage up to 480 V and secondary voltage up to 120/280V. The equivalent current rating for the voltage os about 400 Amps – CU.

## Transformer Amperage Chart:

### Single Phase Transformers, Full Load Amperes (FLC):

 KVA 120V 208V 240V 277V 480V 600V .25 1.2 1. 0.9 0.5 0.4 .50 4.2 2.4 2.1 1.8 1.0 0.8 .75 6.3 3.6 3.1 2.7 1.6 1.3 1 8.3 4.8 4.2 3.6 2.1 1.7 1.5 12.5 7.2 6.2 5.4 3.1 2.5 2 16.7 9.6 8.3 7.2 4.2 3.3 3 25 14.4 12.5 10.8 6.2 5 5 41 24 20.8 18 10.4 8.3 7.5 62 36 31 27 15.6 12.5 10 83 48 41 36 20.8 16.7 15 125 72 62 54 31 25 25 206 120 104 90 52 41 37.5 312 180 156 135 76 62 50 416 240 208 180 104 83 75 625 340 312 270 156 125 100 833 480 416 361 208 166 167 1391 803 695 603 347 278

### Three Phase Transformers, Full Load Amperes (FLC):

 KVA 208V 240V 480V 600V 3 8.3 7.2 3.6 2.9 6 16.6 14.4 7.2 5.8 9 25 21.6 10.8 8.6 15 41.7 36.1 18.0 14.4 30 83.4 72.3 36.1 28.9 45 124 108 54.2 43.4 75 208 180 90 72 112.5 312 270 135 108 150 416 360 180 144 225 624 541 270 216 300 832 721 360 288 500 1387 1202 601 481 750 2084 1806 903 723 1000 2779 2408 1204 963

### Insulation Class and Temperature Rise:

 KVA Insulation 1 Phase 3 Phase NEMA Class Temperature Class Temperature Rise 0.25-25 3-15 F 180Â° C 115Â° C 15-167 15-1000 H 220Â° C 150Â° C