Step Up Transformer - Power Distribution

By R.W. Hurst, President, The Electricity Forum

Step Up Transformer

A Step-Up Transformer is a power distribution transformer in which the secondary currents are higher than its primary voltage. A Step-Up Transformer therefore "steps up" the voltage supplied. For instance, step-up transformer windings are required to use a 220V device in a country which has a 110V electricity supply. A step up transformer 110v 220v converts alternating transformer currents (AC) from primary to secondary voltage. A Step-Up Transformer has no internal moving parts and works on the magnetic induction principle. This means it can be designed to either "step-up" or "step-down" supplied voltage. In this way, a step-up transformer increases the voltage and a step down transformer decreases the power currrents.

This is beacause on a step-up transformer there are more turns on the secondary coil than the primary coil. The induced voltage across the secondary coil is greater than the applied voltage across the primary coil or in other words the voltage has been “stepped-up”. Dry type transformers and isolation transformers with an iron core are often used as a power supply.

The primary components for voltage transformation are primary and secondary winding. The insulation is placed between the turns of wire to prevent shorting to one another or to ground. This is typically comprised of mylar, nomex, kraft paper, varnish, or other materials. As a transformer has no moving parts, it will typically have a life expectancy between 20 and 25 years.

What 'Rating' Transformer Is Needed?
A step-up transformer depends entirely on the products you will be using it with. Give your transformer supplier a detailed list of all the products you will be using with it - and also their maximum outputs. From this information he/she will be able to advise the correct turn ratio, voltage winding and rating needed.


Read Our Other Utility Transformer Pages: Padmount Transformer ExplainedPole Mounted Transformers, Electrical Power Transformers, Power Transformers Explained, Transformer Manufacturers, High Voltage Transformers Explained, What is an Auto Transformer? Three Phase Transformers Explained