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Three-Phase Delta (Δ) Configuration. Another configuration is known as the “Delta,” for its geometric resemblance to the Greek letter of the same name (Δ). Take close notice of the polarity for each winding in the figure below. Three-phase, three-wire Δ connection has no common.
Delta or Mesh Connection (Δ) System is also known as Three Phase Three Wire System (3-Phase 3 Wire) and it is the most preferred system for AC power transmission while for distribution, Star connection is generally used.
A three-phase delta-connected generator feeds a three-phase delta-connected load like the system shown in Figure \(\PageIndex{1}\). Assume the generator phase voltage is 120 VAC RMS. The load consists of three identical legs of 50 \( \Omega \) each.
The two most commonly used three-phase winding configurations are delta and wye, named after the Greek and English letter that each resembles. In a delta configuration, the three windings are connected end-to-end to form a closed path. A phase is connected to each corner of the delta.
In three phase circuit, connections can be given in two types: Star connection. Delta connection. Less commonly, there is also an open delta connection where two single-phase transformers are used to provide a three-phase supply.
There are two basic three-phase configurations: wye (Y) and delta (Δ). As shown in the diagram, a delta configuration requires only three wires for transmission, but a wye (star) configuration may have a fourth wire. The fourth wire, if present, is provided as a neutral and is normally grounded.
A three-phase source or load has six terminals. They must be connected together in the correct way to form a delta connection, or wye connection, as desired. The fact that the three waveforms of a three-phase system are 120° apart gives desirable properties to it that makes it attractive from a practical viewpoint.
Delta Connection. In Delta connection, phase sides are connected in a cyclical arrangement in order to make a closed loop as shown in figure 1. As far as line and phase currents are concerned, they are related to each other as: $ { {\text {I}}_ {\text {line}}}\text {=}\sqrt {\text {3}} { {\text {I}}_ {\text {phase}}}$.
A delta 3 phase wiring involves connecting the three phases in a triangular or delta shape, where each phase is connected to the next in a loop. This configuration forms a closed circuit, allowing the flow of electrical current between the phases.
Whether to connect the three single-phase windings in a 3-phase AC alternator (or motor or transformer) in a wye or delta wiring configuration depends on the desired magnitude of the line voltage compared to the desired magnitude of the line current.