How A Step Up Transformer Works

Transformers step up (increase) or step down (decrease) AC voltage using the principle of electromagnetic induction - mutual induction. A changing current in the primary coil induces an e.m.f in the secondary.

What does a step up transformer do and why?

A step up transformer at the power station steps up the voltage and consequently steps down the current. This means that the current flowing in the overhead cables is relatively small and can be distributed long distances across country.

Is step up transformer AC or DC?

Statement A: Step up transformer converts low voltage, high current to high voltage, low current. Statement B: Transformer works on both ac and dc.

Why is it called a step up transformer?

A transformer that increases the voltage from primary to secondary (more secondary winding turns than primary winding turns) is called a step-up transformer. Conversely, a transformer designed to do just the opposite is called a step-down transformer.

What is the principle of transformer?

The transformer works on the principle of Faraday's law of electromagnetic induction and mutual induction. There are usually two coils primary coil and secondary coil on the transformer core. The core laminations are joined in the form of strips.

What are the 3 types of transformers?

Depending on the Power rating and specification, Power transformers can further be classified into three categories: Small power transformer, Medium Power transformers, and the Large power transformers.

Where is step up transformer used?

Step-up and step-down transformers are used in electricity distribution networks to change the voltage output from a power station (e.g. 25 kV) to that needed for high voltage transmission (e.g. 132 kV or 400 kV) and back down again for use in homes, factories and offices (e.g. 230 V).

Why voltage is step-up?

Power = Voltage x Current This is why we increase the power's voltage at a step-up transformer before sending the power on its journey to the neighborhood. Increased voltage allows decreased current which dramatically reduces power loss.

Why do step-up transformer increase voltage?

In a step-up transformer, the primary winding has fewer turns, while the secondary winding has more turns. This configuration causes the voltage to increase.

Does step-up transformer increase current?

A step-up transformer has more turns of wire on its secondary coil than it does on its primary coil. Transformers will only work with an alternating current (ac) input. This transformer steps up the voltage by reducing the current.

What are 4 types of transformers?

Types of Transformers

• Power Transformers. A power transformer transfers electricity between a generator and the distribution primary circuits.
• Autotransformers. Now, let's make things even more complicated. ...
• Generator Step-Up Transformers. Moving right along to GSUs or generator step-up transformers. ...
• Auxiliary Transformers.

How a transformer works in simple terms?

When a transformer is working: a primary potential difference drives an alternating current through the primary coil. the primary coil current produces a magnetic field, which changes as the current changes. the iron core increases the strength of the magnetic field.

Why does a transformer require AC?

transformer work only on ac supply because A transformer needs an alternating current that will create a changing magnetic field. A changing magnetic field also induces a changing voltage in a coil. This is the basis of how a transformer works: The primary coil is connected to an AC supply.

What are the 2 sides of a transformer called?

A transformer. The two inductors in a transformer are called windings. The primary winding receives the input signal, and the secondary winding generates the output signal. As shown in Figure 1, when we draw an inductor, the primary winding is on the left and the secondary winding is on the right.

Why kVA rating is used in transformer?

The first reason is the power loss in the transformer. Thus, the total losses in a transformer depend upon volt-ampere (VA) only and not on the power factor of the load. That is why the transformer rating is given in kVA and not in kW.

Which oil is used in transformer?

Mineral oils are still widely used in the industry. Mineral oil is generally effective as a transformer oil, but it has some disadvantages, one of which is its relatively low flashpoint versus some alternatives. If a transformer leaks mineral oil, it can potentially start a fire.

Do step up transformers work in DC?

When dc voltage source is applied across a primary coil of a transformer, the current in primary coil remains same, so there is no change in magnetic flux and hence no voltage is induced across the secondary coil. Hence, a step up transformer cannot be used to step up DC voltage .

What increases step up transformer?

The step-up transformer increases the output voltage and the step-down transformer decreases the output voltage. In the step-up transformer, the voltage binding is high. In step down transformers, the voltage binding is low. The step-down transformer decreases the voltage from the primary to the secondary coil.

Why is 240 volts more efficient?

The reason why 240V is advantageous for appliances and heaters in a home has to do with amperage. The electrical panel in your home is limited by amperage, and most panels nowadays are 200amp panels. At 240V the amperage is 50% of what it is at 120V.

Why current is low when voltage is high?

As electricity is transmitted over long distances, there are inherent energy losses along the way. High voltage transmission minimizes the amount of power lost as electricity flows from one location to the next. How? The higher the voltage, the lower the current.