Substation and system intertie transformers

Substation transformers transfer the incoming high-voltage to the next lower voltage level. As an example, an incoming high-voltage of 400 kV would be transferred down to 220 kV.

In general, substation transformers are equipped with on-load-tap-changers (OLTC). Incoming transmission lines are connected to the transformers through bushings and cables through cable boxes and cable sealing ends. These transformers are built in core form with auto-connected windings, ie common main winding and a separate low voltage winding.

• Ratings up to 1,300 MVA (sometimes higher ratings are required)
• Primary voltage up to 765 kV and higher
• Secondary voltage generally <= 230kV or higher depending on the grid configuration
• Load tap changers generally required
• Single- or three-phase

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