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Matters needing attention in circuit expansion?

Power grid expansion is actually the expansion of power supply capacity of power grid.

It includes two levels, one is the expansion of power transmission capacity, and the other is the expansion of substation capacity.

Transportation capacity mainly refers to the line, which is limited by the line section model.

Substation is mainly determined by the number and capacity of transformers.

In addition, the expansion also needs to consider the matching of transmission and substation.