Wye versus Delta Selection in the Real World

At this point you may be asking "Why use a Delta arrangement at all when the Star arrangement produces more power?" This is a very good question and here's one answer.

In commercial wind-driven AC alternators (such as the ones described in the end of this chapter), the three-phase coils are automatically switched between Wye and Delta based mainly on the speed of the blades. When the wind turbine is just starting up, the coils are configured as a Wye, which allows the wind turbine to generate the same power at lower rpm's. However, when the wind turbine comes up to speed, the extra voltage generated with the Wye arrangement is generally too high for the rated load, so the coils are automatically switched to a Delta arrangement to generate more current at a lower, but standardized voltage. Another reason for starting a wind turbine with a Wye winding setting is because it allows the turbine to come up to speed faster. Therefore both Wye and Delta coil arrangement have their individual applications in real-world power producing systems.

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