What is the purpose of step up transformer in electrical power system?

What is the purpose of step up transformer in electrical power system?

The main use of transformer in electrical power system is to produce the needed voltage level. Some time voltage is needed to be increased or decreased than the available voltage level. Depending on the operation, transformers can be divided into two types,

(i) Step up transformer,
(ii) Step down transformer.

As the name suggests, the step up transformers are used to step up the voltage level. These are also termed as power transformer when used in power plants. Similarly step down transformers are used to step down or bring down the voltage.

Now, coming to the step up transformer, they are used in electrical power system at generation level. When power is generated at power plants the voltage level is pretty low.
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So when they are transmitted from generation station to distribution substation, power is reduced due to the different types of losses and the voltage of the receiving end decreases radically and thus the economic purpose is also not served.

That’s why step up transformers are introduced at the power plants to step up the voltage level before transmission. So, the receiving end voltage is not decreased too much.
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Again as this high voltage cannot be used directly, so voltage is again stepped down by step down transformer before distribution.
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