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What is the relation between phase and line voltage?
What is the difference between a wye-connected system and a delta-connected system?
In a wye-connected system, one end of each of the three-phase windings is connected to a common neutral point, while in a delta-connected system, the end of each shape is connected to the start of another phase winding. Wye connections are used more commonly in low voltage systems, while a delta connection is preferred for high voltage systems.