Electrical

# Difference between Star and Delta Connections

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Difference between Star and Delta Connections

Star and delta connections are two common methods used in electrical systems to connect three-phase AC devices.

1. Configuration:
• Star (Wye) Connection: In this configuration, the three phases are connected at a common point, forming a star or wye shape. This common point is often grounded.
• Delta (Mesh) Connection: In this configuration, the three phases form a closed loop, resembling a delta or triangle. There is no common point.
1. Voltage Relationship:
• Star Connection: The line voltage (VL) is equal to the phase voltage (VPh). The line current (IL) is √3 times the phase current (IPh).
• Delta Connection: The line voltage (VL) is √3 times the phase voltage (VPh). The line current (IL) is equal to the phase current (IPh).
1. Impedance Transformation:
• Star Connection: Each phase impedance is the same as the line impedance.
• Delta Connection: Each phase impedance is √3 times the line impedance.
1. Application:
• Star Connection: Commonly used in power distribution systems and for devices requiring a neutral connection.
• Delta Connection: Often used in high-power applications where a neutral connection is not needed, such as motors.