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Electrical systems or power transformers always has start and delta connections.
1. Star transformer connection
In a star transformer connection, each phase of the system is connected to a common point, called the neutral or star point, which is usually grounded.
Star connections are commonly used in power distribution systems where a neutral conductor is required, such as for supplying single-phase loads, Earthing systems, and for systems that require the flexibility of providing both three-phase and single-phase supplies.
2. Delta transformer connection
In this delta transformer connection, the three phases are connected end-to-end in a triangle or delta shape, each phase is connected to two neighboring phases, forming a closed loop. This connection allows for a balanced three-phase load to be supplied with three wires, rather than the four wires required for a wye connection.
Delta transformer connections are commonly used in high-voltage power transmission and distribution systems, as well as in industrial applications where large motors or other heavy loads are used. They are also used in some residential and commercial settings, such as pad mounted transformer and small substaion transformer.
