Voltage regulation of Transformer

Voltage Regulation of Transformers:-

Voltage regulation as it is very much clear from its name is how much %age change in voltage of any device with respect to change in load i.e. change in voltage with respect to load.

In same way in case of Transformers voltage regulation is known as change in voltage from no load to full load.

It is simply written as

Voltage regulation of Transformer = Change in Output voltage/ No Load output voltage

Regulation =Voltage at no load-Voltage at full load

                                Voltage at No load

 

Voltage regulation is defined in 2 ways i.e. either UP or Down. That is when the load is connected to the secondary output terminal, the terminal voltage goes down, or when the load is removed, the secondary terminal voltage goes up. This means that regulation of transformer depends upon which voltage will be used during calculations i.e. no load voltage or full load voltage.

% Regulation(down)= Voltage at no load- Voltage at full load X 100%

                                                                Voltage at No load

%Regulation (UP)= Voltage at no load- Voltage at full load X 100%

                                                                Voltage at full load

Now lets illustrate this with an example if you have a single phase transformer and has open circuit no load terminal voltage as 230 V and this terminal voltage drops to 210V on applying the load .

Then Transformer voltage regulation will be= ((230-210)/230)*100% = 8.69%

 Thus transformers voltage regulation can be expressed as either a unit change value or as a percentage change value of the no-load voltage.