Variable transformer is a device whose output voltage can be varied between zeros to maximum. It basically transforms voltage through magnetic coupling with no moving parts. The transformer is generally consists of a magnetic core that is associated with two or more couple windings that either steps up or down the incoming voltage.
These transformers plays important role in electrical industry as they are responsible for transfer of energy from one circuit to other with the help of magnetic core. These transformers have been divided in different types according to the field for which it is meant for. Variety of transformers available today is step up, step down, electric transformer, variable auto transformer, current transformer, linear variable transformer, high voltage, low voltage, distribution, isolated, enclosed, core and plugged transformers and many more. Leta€?s have a look over commonly used types in brief:
Step up- It increases the voltage even when we reduce the current.
Step down- It overturns the winding relation.
Isolation- It can split a circuit into primary and secondary and this break will not allow direct current noise during this. This type of transformer also protect from shock caused due to high voltage expulsion.
Variable auto transformer- It can change the voltage to the secondary circuit. It is usually used through low voltages and also protects arching.
Current - This type of transformer permits to use an ammeter straight away into a circuit.
High voltage- They deal with voltages that cannot be used directly by the customers.
Low voltage- It is a kind of distribution transformer with both primary and secondary windings designed to operate in a particular system voltage. These are often small in sizes.
The device offers exceptional versatility and reliability which is required in plethora of voltage control applications in both laboratory environments and industrial applications. Talking about its process of working, when an electric current passes through a wire, it generates a magnetic field around it. Higher the electric power more will be the magnetic field around it.
The current in the first coil is termed as primary current and in the second coil it is known as secondary current. Today there are a number of transformer as well as servo stabilizer manufacturers are there who also have a wide online presence so that customer sitting in any nook and corner of the world can reach them. But, prior to purchasing you must consider several things. These include the following:
a€¢ Motor driven variable transformers allow remote adjustments.
a€¢ Higher frequencies can be provided to the variable transformers. But this is possible generally at lower ratings.
a€¢ Variable voltage transformers with primary and secondary windings permit windings to have voltage range independent from one another.
In addition, there are many advantages of variable transformers and these are:
a€¢ Good regulation
a€¢ Moderate cost
a€¢ Low maintenance required
a€¢ Less noisy at the time of operation
a€¢ Efficient and low losses at low and maximum rated loads
a€¢ Act as a automatic voltage regulator
a€¢ Available in different types so different industries can choose as per their requirement
After the advantages, it is the turn to describe about the applications of variable transformers. These applications are:
a€¢ Used in mining industries
a€¢ Used in electronic and electrical industries
a€¢ Used in power transmission applications
a€¢ Used to transfer voltage from one circuit to the other and many others
