Expt 42

Expt 42 - Experiment 42 The Autotransformer OBJECTIVE To...

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Experiment 42 The Autotransformer OBJECTIVE To study the voltage and current relationship of an autotransformer. To leam how to connect a standard transformer as an autotransformer. DISCUSSION There is a special type of transformer which physically has only one winding. kunctionally, though, the one winding serves as both the primary and secondary. This type of transformer is called an autotransformer. When an autotransformer is, used to step up the voltage, part of the single winding acts as the primary, and the entire winding acts as the secondary. When an autotransformer is used to step down the voltage, the entire winding acts as the primary, and part of the winding acts as the secondary. Figure 42-1 (a) and Figure (b) show autotransformers connected for both step- up and step-down operation. The action of the autotransformer is basically the same as the standard two-winding transformer. Power is transferred from the primary to the secondary by the changing magnetic field, and the secondary in turn, regulates the current in the primary to set up the required condition of equal primary and secondary power. The amount of step-up or step-down in voltage depends on the turns ratio between the primary and secondary, with each winding considered as separate, even though some turns are common to both the primary and secondary.
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This note was uploaded on 09/29/2008 for the course EEE 360 taught by Professor Gorur during the Spring '08 term at ASU.

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Expt 42 - Experiment 42 The Autotransformer OBJECTIVE To...

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