Posts Tagged ‘input 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


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