Discussion
Larger buildings may be supplied with a medium voltage electricity supply, and will required a substation or mini-sub. What is the main item of equipment contained in these?
Answer: A
The main item in a substation is a transformer.
It steps the medium-voltage supply, typically 11 kV, down to the 400/230 V used in the building. Transformers work only on alternating current, which is why AC won the battle of the systems.
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