Power transformer

Power transformer is an electrical power equipment
serves to channel the energy / power from high voltage
to
low voltage or vice versa (transform the voltage)
with the same frequency).

In general operation, the transformer-earthed power transformer
at the point of neutrality in accordance with the need for security systems
or protection. For example transformer 150/70 kV grounded in
directly on the neutral side of 150 kV, and transformer 70/20 kV grounded
with inmates in its 20 kV neutral side. The transformer has been
produced in advance by the appropriate testing standards
determined.