Posts Tagged ‘output terminal’

Dual Voltage Transformers

July 9th, 2013 | Make a comment | Posted in Electrical distribution
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As promised, Nasir’s 8th article from his back to basics series about transformers! This 8th article deals with dual voltage transformers and explores the 2 types of voltages at the output. If you want your works, testimonies, personal opinion, reviews or tutorials to be published in the blog, just send us a mail.

Definition of a Dual voltage Transformer

A dual voltage transformer can be defined as the one which is capable of providing two types of voltages i.e. if the two separate windings are connected in series, they will provide the sum of voltages supplied to the two coils and if the two windings are connected in parallel, then the net voltage will be decreased.

These voltages can be switched within the transformer according to the type of output required, just be using a dual voltage switch.

Construction and working

Suppose we have a dual voltage transformer which has two windings connected in series at the input terminal and two other windings also connected in series at the output terminal at the place of the secondary coils. Then if each of the two primary windings are rated at 120 volts each, the total voltage at the input terminal will be equal to 120 V + 120 V = 240 Volts.

Similarly at the output terminal if both the secondary coils are rated at 12 volts each then the total voltage at the secondary terminal would also be equal to 24 volts. This is evident from the figure below:

Dual Voltage Transformers 1


Difference Between Series & Parallel Transformer

June 21st, 2013 | Make a comment | Posted in Electrical distribution
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Right after the article “Behavior of Transformer on Loading“, let’s read the 5th part of Nasir’s tutorial on transformers. You want your articles, works, reviews or tutorials be published in our blog? Simply send us a mail!

We know that a transformer generates its current output with the help of two windings, namely Primary and secondary windings. The primary coil of the transformer is always connected to the alternating power supply, as it is the only method of supplying power to the transformer, by connecting the power supply in parallel with the two free ends of the primary windings. The current produced is then transferred to the secondary winding by Faraday’s law of Mutual Induction.

Since a transformer can have more than one primary winding or secondary windings as well, so if two or more coils exist at any terminal, then they can be connected with each other in two basic ways. These two ways for connecting the two or more windings with each other are:

  1. Series Connections
  2. Parallel Connections

Series Connection of windings

The secondary windings of a transformer, connected in series are shown below:

Difference Between Series & Parallel Transformer 1


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