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A power substation is where the grid changes voltage and routes electricity between transmission and distribution. Here is what a substation does, what is inside it, and how the main types differ.

A transformer is built around a magnetic core and two or more windings, then insulated and cooled. Here is what each internal part does inside an oil-immersed distribution transformer.

A ring main unit (RMU) is compact medium-voltage switchgear that connects a load to a ring distribution network. Learn what an RMU does, what is inside it, and how to choose one.