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A three-phase AC generator has a rotor with a rotating magnet placed within the stator mounted with the stationary three-phase winding to generate three-phase voltages via mutual induction. These windings are evenly distributed around the inner circumference of the stator and are arranged 120 electrical degrees apart. Three-phase stator windings consist of three separate coils or groups of coils, known as phases, each connected in Y (star) configuration or Delta configuration.

As the rotor spins, its rotating magnetic field intersects with the stator windings and induces equal-magnitude voltages, having a phase difference of 120 degrees. Each winding acts as a single-phase generator, enabling the three-phase generator to power both single-phase and three-phase loads. The three-phase system comprises three voltage sources connected to loads using three or four conductors. In a Y-connected system, the voltage sources have identical amplitude and frequency and are separated by 120 degrees; the voltages across lines a, b, and c to the neutral line represent the phase voltages. These voltages are called balanced when equal in magnitude and phased out by 120 degrees from each other. In a Delta-connected voltage source with identical amplitude and frequency, and a phase difference of 120 degrees, the voltages between lines a, b, and c do not involve a neutral line and are known as line voltages. These line voltages are called balanced when equal in magnitude and maintain a 120-degree phase difference from each other.

In a wind turbine, the rotating blades spin the generator's rotor, inducing a three-phase voltage in the stator coils, which is then transformed and transmitted to the grid.

Tags

Three phase VoltageAC GeneratorRotorStatorMutual InductionY star ConfigurationDelta ConfigurationPhase DifferenceSingle phase GeneratorBalanced VoltagesVoltage SourcesNeutral LineLine VoltagesWind TurbineGrid Transmission

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8.2 : Generation of Three-Phase Voltage

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8.1 : Three-Phase Circuits

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8.3 : Three-Phase Voltages

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8.4 : The Y-to-Y Circuit

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8.5 : The Y-to-Delta Circuit

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8.6 : The Delta-to-Delta Circuit

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8.7 : The Delta-to-Y Circuit

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8.8 : Power in a Three-Phase Circuit

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8.9 : Power Distribution in Three-phase and Single Phase Circuits

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8.10 : Line Loss

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8.11 : Reducing Line Loss

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