Compare star and Delta Connection.
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Sr.No. Star connection Delta connection
1. Star connection have a neutral or star point. Delta connection have no star or delta point.
2. Star connection do not form a close loop. Delta connection forms a close loop.
3. One end of each three loads connected together and forms a neutral and remaining three ends are taken out connection. One terminal of load is connected to another terminal of load and forms a closed loop and common ends are taken out for connection.
4. Line voltage (VL) = √3 Phase voltage (Vph) Line voltage (VL) = Phase voltage (Vph)
5. Line current (IL) = Phase current (IPH) Line current (IL) = √3 Phase current (IPH)
6. Star connection can be use as 3 phase 3 wire system or 3 phase 4 wire system. Delta connection can only be used as 3 phase 3 wire system.
7. Star connection is generally used in power transmission. Delta connection is generally used in power distribution.
8. Low insulation requires as phase voltage is low. Heavy insulation is required as line voltage is equal to phase voltage.
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Compare star and Delta Connection.
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Parameter
Star Connection
Delta Connection
Basic definition 
One terminal of each of the three branches are connected together to form a common point. Such a connection is known as Star Connection 
The three branches of the network are connected in such a way that it forms a closed loop. Such a connection is known as Delta Connection
Connection of terminals
The similar ends of the three coils are connected together to form a common point.
The end of each coil is connected to the starting point of the other coil that means the opposite terminals of the coils are connected together to form a closed loop.
Neutral point
Neutral or the star point exists in the star connection.
Neutral point does not exist in the delta connection.
Relation between line and phase current
Line current is equal to the Phase current.
Line current is equal to √3 times the Phase Current.
Relation between line and phase voltage
Line voltage is equal to √3 times the Phase Voltage
Line voltage is equal to the Phase voltage.
Diagram
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