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The topic of my graduation project is the design of electrical main wiring in 2× 600MW thermal power plant. How to determine the number of incoming lines?
The 600MW unit is directly connected to the step-up transformer, that is, the generator-step-up transformer group wiring?

The high voltage side of the step-up transformer is generally 3/2 wired.

Generally speaking, the incoming line is the power line and the outgoing line is the load line.

2×600MW, that is, the 2-way incoming line, and the outgoing line depends on how many ways you access the power system.