What is the Purpose of AuxiliaryTransformer in Substation?

An auxiliary transformer is a type of transformer that is used to supply power to the auxiliary equipment in a substation, such as lighting, heating, ventilation, air conditioning, battery charging, switchgear operation, tap changer drives, and control and protection systems.

Auxiliary transformers are usually stepped-down transformers that reduce the voltage from the main power supply to a suitable level for the auxiliary loads.

Auxiliary transformers can have different sources of primary power, such as the tertiary winding of a power transformer, a distribution feeder, or a dedicated generator.

Auxiliary transformers can also provide isolation and fault protection for the auxiliary circuits. Auxiliary transformers are essential for the reliable and safe operation of a substation.