The substation requires several fiber optic communication cables

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The lightweight, ruggedness, and flexibility of fiber allow it to be easily installed in the substation. The substation receives electrical power from a generating plant like a solar or wind farm. At the transmission substation, the power is processed before it is distributed, as step-up transformers substantially increase the voltage to reduce the loss that would otherwise occur when the electricity. In the early days of protective relaying, it was recognized that communications between substations could improve relaying performance. by replacing many copper control cables with fiber-optic links for ala m and control signals.

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