Power Transformer in Substation : Best Guide Ever on Power Transformers used in Electrical T&D Grids

Power Transformer is the Most Important and costliest electrical device in the transmission substation and in the Power Grid.

The function of Power Transformer in Substation is to transform the Voltage level.

As per its design, the Transformers life is 20-35 years, but with proper maintenance, its possible increase is life to 60 years. At the Transformer ages, its internal condition degrades, which increases the risk of failures. Switch very important, to carry out the proper maintenance of the transformer by accurately predicting its insulation condition.

Applications of Power Transformers:

1. Generator Transformers
2. Unit auxiliary Transformers/ station Transformers
3. Transmission Transformers
4. Auto Transformers

which type of transformer used in substation

Based on Voltage Level:

High Voltage Transformer

Low Voltage Transformer

Based on design:

• Shell type transformer
• Core type transformer

Base upon cooling:

1. ONAN (all natural air natural): cooling is done by using radiators
2. ONAF (Oil Natural Air Forced): cooling is done using Radiator and Fan
3. OFAF (Oil Forced Air Forced): Colling is done using Radiator, Fan and Pump
4. OFW (Oil forced water): Cooling is done using Heat Exchangers.

substation power transformer ratings

power rating

transformer substation diagram

Parts of the Transformer:

Power transformer parts can be divided into internal parts and external parts:

Substation Transformer Cost:

Transformer Protection/Switchgear:

Power Transformer Testing

Short Circuit Test