What is the function of transformer 33kv?

A '33-kV transformer' is a three-phase primary-distribution transformer, used in the UK's electricity system to step down the 33-kV primary-distribution voltage to the 11-kV secondary-distribution voltage -the lowest voltage used in the high-voltage distribution system. These Transformers are categorised as 'power transformers', and are located in what are termed 'primary substations'.