In the 1880′s the development of transformers contributed essentially to the enforcement of alternating and current technology. Transformers enable the transmission of electrical energy using the voltage adapted to power and distance. A is made of three sets of primary and secondary windings, each set wound around one leg of an iron core assembly. A transformers must have (3) coils or windings connected in the proper sequence in order to match the incoming power.

Three-Phase delta wye Circuits Diagram Three phase core has three sets of windings. Those sets of primary and secondary windings will be connected in either ? (delta) or Y (wye) configurations to form a complete unit. The three primary windings (P1, P2, P3) will be connected at the factory to provide the proper sequence (or correct polarity) required and will be in a configuration known as Delta. The three secondary windings (S1, S2, S3) will also be connected at the factory to provide the proper sequence (or correct polarity) required.

Find more detail discussion on Transformers Circuits Diagram here:
Transformers Circuits Diagram – link (source: www.allaboutcircuits.com)
3 Phase Electrical Power link (source: www.3phasepower.org)
electric power – link (source: www.wikipedia.org)

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