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The star delta connection is a type of electrical connection commonly used in three-phase power systems to control the voltage and current to electrical devices such as lamps.
In a star delta connection, the lamps are connected in either a star (Y) or a delta (Δ) configuration. In the star configuration, the lamps are connected between the three phase wires and a neutral wire, while in the delta configuration, the lamps are connected in a closed loop between the three phase wires.
When the lamps are connected in a star configuration, the voltage across each lamp is reduced to 1/√3 of the phase-to-phase voltage, while the current flowing through each lamp is the same as the phase current. This makes it useful for controlling the brightness of lamps, as reducing the voltage across the lamps reduces the brightness.
On the other hand, when the lamps are connected in a delta configuration, the voltage across each lamp is the same as the phase-to-phase voltage, while the current flowing through each lamp is 1/√3 of the phase current. This makes it useful for controlling the power consumed by lamps, as reducing the current flowing through the lamps reduces the power consumed.
In practice, the choice of star or delta configuration depends on the specific application and the desired outcome.