Star and Delta Connected 3 Phase Supplies

Star Connection (Y)

A type of three-phase connection where the line voltage is √3 times the phase voltage, allowing for higher voltage transmission, and provides a neutral point.

Delta Connection (Δ)

A three-phase connection configuration where the line current is √3 times the phase current, suitable for handling higher currents without requiring a neutral point.

Line Voltage vs Phase Voltage in Star Connection

In a star connection, the line voltage (VL) is higher than the phase voltage (VP), specifically, VL = √3 * VP.

Neutral Point in Star Connection

A grounding point provided by the star connection, useful for supplying single-phase loads.

Higher Current Capacity in Delta Connection

A feature of delta connection where it can handle higher currents, making it suitable for heavy loads.

Starting Torque in Star Connection

In motor applications, a star connection can be used to reduce starting torque, allowing motors to start with lower currents.

Torque Characteristics in Delta Connection

Delta connections provide higher starting torque, advantageous for applications requiring strong initial power.

Load Balancing in Star Connection

Helps balance loads across phases, maintaining system stability and efficiency.

Phase Voltage Equalization in Delta Connection

In delta connection, each load phase connects directly across line voltage, helping to equalize voltage drops.

Reduced Harmonics in Delta Connection

Delta connections can help lower certain types of electrical harmonics, improving overall power quality.