Formula for conversion from delta to Star connection: Star= V L / √3. Where V L is line to line voltage in delta connection. Star is line to line voltage in star connection. In star connection, the insulation required for each phase is less because line voltage and phase voltage are different.

The typical star-delta control circuit wiring diagram in the CAD drawing below will help you follow the explanation. The star-delta control circuit illustrated above actuates magnetic contactors that interchangeably execute star-delta motor connections. Pushing the ON switch causes the motor to start running from the star connection to the

Phase current and line current for star connection is equal to each other. Line current is √three times of phase current for delta connections. Speed as starters. Star connected motors are usually slower as they get 1/√3 rd of the voltage. Delta connected motors are usually faster as they get the full line voltage.
In this article Difference Between Star and Delta Connection are explained. In a three phase circuit, there are two types of connections. One is known as Star Connection, and the other one is Delta Connection. A star connection has a common or a star point to which all the three terminals are connected forming a star shape as shown below. In

Star-Delta Transformations and Delta-Star Transformations allow us to convert impedances connected together in a 3-phase configuration from one type of connection to another. We can now solve simple series, parallel or bridge type resistive networks using Kirchhoff´s Circuit Laws, Mesh Current Analysis or Nodal Voltage Analysis techniques.

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A Star Connection is a 4 – wire system and a Delta Connection is a 3 – wire system. Hence, most of the power generated and distributed is actually a 3 – phase power (but majority of households will receive a single phase supply).
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