How Does a Step Up/Down Transformer Work


Electrical transformers are essential equipment to control the voltage and flow of current. The Step Up & Step Down transformers are the widely used transformers to control the voltage for any electrical devices. There are primary and secondary winding’s in both the transformers. It is used to convert either high primary voltage to secondary voltage or low primary voltage to high secondary voltage. It depends on the number of turns of the primary or the secondary winding’s.

In this article, we will focus primarily on the step up transformers, including the construction, operating procedure, and advantages of the step up power transformer. Let’s look at step up transformers in detail.

What is a step up transformer?

A step up transformer is a transformer whose secondary voltage is more than the primary voltage. They are known to step up or raise the voltage level to meet the current requirements of different appliances and devices. While the voltage is increased, the current flow remains stable so that no electric fault takes place. Most power transmitting and power producing stations use the step up electrical transformers to deliver the desired voltage.

The transformer converts the high-current, low voltage input into a low-current, high-voltage output. The primary winding in the transformer has fewer turns than the secondary winding, hence – higher secondary voltage. The more number of secondary turns entail that there will be greater output value than the input voltage.

Step up transformers: Construction and components


The step up transformer applies the principles of magnetic induction. It comprises two major components – the core and the windings.

Step up electrical transformers manufacturers use a highly permeable substance in the core that enables magnetic current to flow without wasting much of it. The core will limit the magnetic flux lines through the strong core material. Therefore, the transformer waste is reduced, leading to higher efficiency during operations. Core heating is minimized by laminating the core to hold the eddy current, which leads to minimal waste.

Windings are responsible for transferring the electric current. Manufacturers of power transformers Canada, construct high-quality windings to keep the transformer cool and handle high heating conditions. The primary coil winding density is thick but comprises fewer turns.

On the other hand, the secondary coil winding density is thin but comprises more turns. Therefore, the secondary side contains more energy than the primary side leading to higher voltage transfer. Both copper and aluminium can be used in the coil. While aluminium is inexpensive, copper drastically improves the transformer life cycle.

How does a step up transformer work?

The principle of the step up transformer is simple. However, it can also work as a step down transformer, depending on the direction of the flow of current. In the step up transformer, the output value is larger than the input value. As the alternating current flows across the step up power transformer, it will transform in one direction, stop, and then change the direction to transform into another one.

The flow of current gives rise to a magnetic flux in the winding area. When the current flow adjusts its direction, the direction of the magnetic poles will also be different. The voltage is produced in the windings through the magnetic field.

Similarly, the voltage produced across the secondary winding when it is situated in a moving magnetic flux is known as the mutual induction effect. Hence, a moving magnetic flux is produced by the AC in the primary winding so that the voltage can be built on the secondary winding.

Most electrical transformers manufacturers build step up transformers for a generator step up device that is used in all generating plants.

Why use step up transformers?

Step up transformers are heavily used for both residential and commercial purposes. They have extensive uses in power plants as well as commercial spaces to regulate the voltage fluctuations and power up various electrical devices. Here’s why you should use step up transformers –

  • The step up transformer comes with a quick start. There’s no need to set up a whole lot of processes before operating the transformer.
  • The transformer requires low maintenance as there is not much load on the primary windings, which can get damaged over a period of long usage.
  • Step up power transformers, Canada, come with high efficiency grades and do not waste energy when the flow of current is taking place.


The most common usage of step up transformers is in electrical power distribution. To minimize the wastage of energy that travels to miles before it reaches the residential or commercial property, step up transformers are used.

A good quality step up transformer improves the voltage while stabilizing the current flow. They are essential for power generation as energy can easily flow through miles and miles of distance. Step up transformers are the perfect choice for heavy load electrical appliances and industrial equipment.