Auxiliary Transformer

If you work in a power plant or power grid station or are familiar with such kind of power generation or power transmission system, you must know the function of the station transformer or auxiliary transformer. I feel obliged to answer this question for those who are a little bit far from this kind of working field.

Let it make it easier to understand the station transformer, assuming that you have some basic knowledge about how a power plant or power grid station, or substation works. Any electrical or mechanical device may go out of order at any time. In such a situation you cannot afford a plant shut down due to the failure of any device.

Station or auxiliary transformers are invariably used in all Grid Sub-Stations & Power plants. The KVA ratings of station transformers are normally 100 KVA, 33/0.4 kV. It is connected to the 33kV Main /Transfer Bus bar in the Grid substation with required protection & control.