The balance of power flowing through a substation consists of the power flowing in through collection cables, flowing out through further collection (system) cables and/or transmission cables, and being lost in the substation, e.g., through resistive losses. By giving the power terms involved a consistent sign (e.g., positive for inflow and negative for outflow and losses), the balance corresponds to the sum of all signed power terms being zero.
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Cite the database: Quaeghebeur, E., Sanchez Perez-Moreno, S., and Zaaijer, M. B.: WESgraph: a graph database for the wind farm domain, Wind Energ. Sci., 5, 259–284, 2020. doi:10.5194/wes-5-259-2020
This page: https://wesgraph.anemona.io/concept/substation-power-balance/