As we know that Star & Delta Connection only possible in 3 phase system, so in our domestic system it is not possible, because generally all house hold electrical equipment are designed with single phase supply. In a three phase circuit, there are two types of connections. One is known as Star Connection, and the other one is Delta Connection.
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Star Connection vs. Delta Connection
Star connection is used where we require Neutral terminal to obtain Phase voltage.
Delta connection is used where we not require neutral terminal to obtain phase voltage.
In Star connection, the line current is equal to the Phase current, (IL = IPH) .
In Delta Connection the line current is equal to root three times of the Phase Current (IL = √3 IPH).
In Star connection, line voltage is equal to root three times of the Phase Voltage, (VL = √3 VPH).
In Delta Connection line voltage is equal to the Phase voltage (VL = VPH) .
In Star Connection, each winding receives 230 volts.
In Delta Connection, each winding receives 415 volts.
Both 3 phase 4 wire and 3 phase 3 wire system can be derived in the star connection,
In Delta Connection only 3 phase 4 wire system can be derived.
The Speed of the star connected motors is slow as they receive 1/√3 one root third of the voltage.
The Speed of the delta connected motors is high because each phase gets the total of the line voltage.
The amount of Insulation required in Star Connection is low.
In Delta Connection high insulation level is required.
Star Connection system is general and typical to be used in Power Transmission line.
Delta Connection is general and typical to be used In Power Distribution line and industries.