# How do you size a step up transformer?

Contents

## How do you calculate transformer size?

Transformer full load current = kVA / (1.732 x Volt)

1. Transformer full load current = kVA / (1.732 x Volt)
2. Transformer full load current = 1000 / (1.73 2× 480) = 1203 Amp.
3. Short circuit current at TC secondary (Isc) = Transformer full load current / Impedance.

## What is the formula for step-up transformer?

The currents Ip and Is in the primary and secondary coils are related by IsIp=NpNs I s I p = N p N s . A step-up transformer increases voltage and decreases current, whereas a step-down transformer decreases voltage and increases current.

## How many amps can a 25 kva transformer handle?

Three Phase Transformer

KVA 208V 480V
20 56.6 24.1
25 69.5 30.1
30 83.4 36.1
37.5 104 45.2

## What size step-down transformer do I need?

If you’re traveling to another part of the world where the voltage is 220–240 volts – which is actually the norm in most countries – and you plan on taking a 120-volt appliance, then you will need a step-down voltage converter. A step-down transformer can convert 220–240 volts down to 110–120 volts.

## Can I use step down transformer as step up transformer?

Yes, you can use the step down transformer as step up. When you apply 220V to the primary, you get around 12V at the output. You can get max 1A at the output. Now you can use the same transformer as step up.

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## What size breaker do I need for a 45 kVA transformer?

For a 45kVA transformer, 125A×1.25=156A, so use a 175A protection device.

## How many houses can a 100 kVA transformer handle?

8 – 500 kVA connects a nominal number of 103 customers, 100 kVA connects 14 customers.