STAR & DELTA CONNECTION

Telugu version II English version II Hindi version

English version

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Main Different between Star and Delta Connections

Comparison between Star

Comparison between Star and Delta Connections
Comparison-between-Star-and-Delta-Connections-Copy.jpg

(Y) and Delta (Δ) Connections

Star (Y) Connection Delta (Δ) Connection
In STAR connection, the starting or finishing ends (Similar ends) of three coils are connected together to form the neutral point. A common wire is taken out from the neutral point which is called Neutral. In DELTA connection, the opposite ends of three coils are connected together. In other words, the end of each coil is connected with the start of another coil, and three wires are taken out from the coil joints
There is a Neutral or Star Point No Neutral Point in Delta Connection
Three phase four wire system is derived from Star Connections (3-Phase, 4 Wires System) We may Also derived 3 Phase 3 Wire System from Star Connection Three phase three wire system is derived from Delta Connections (3-Phase, 3 Wires System)
Line Current is Equal to Phase Current. i.e.Line Current = Phase Current

I= IPH

Line Voltage is Equal to Phase Voltage. i.e.Line Voltage = Phase Voltage

V= VPH

Line Voltage is √3 times of Phase Voltage. i.e.VL = √3 VPH Line Current is √3 times of Phase Current. i.e.IL = √3 IPH
The Total Power of three phases could be found byP = √3 x VL x IL x CosФ …. Or

P = 3 x VPH x IPH x CosФ

The Total Power of three phases could be found byP = √3 x VL x IL x CosФ … or

P = 3 x VPH x IPH x CosФ

The speeds of Star connected motors are slow as they receive 1/√3 voltage. The speeds of Delta connected motors are high because each phase gets the total of line voltage
In Star Connection, the phase voltage is low as 1/√3 of the line voltage, so, it needs low number of turns, hence, saving in copper. In Delta connection, The phase voltage is equal to the line voltage, hence, it needs more number of turns.
Low insulation required as phase voltage is low Heavy insulation required as Phase voltage = Line Voltage.
In Power Transmission, Star Connection system is general and typical to be used. In Power Distribution and industries, Delta Connection is general and typical to be used.

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