Line Voltage for a Delta Connected Alternator

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In a delta (Δ) connected three-phase alternator, the three phase windings are connected end-to-end to form a closed triangular circuit, and each winding is directly connected between two line conductors. Therefore, the line voltage is equal to the phase voltage, expressed as VL=VphV_L = V_{ph}. Unlike a star-connected alternator, there is no 3\sqrt{3} multiplication between phase and line voltage in a balanced delta connection. Thus, if each phase winding generates 230 V, the voltage measured between any two line terminals is also 230 V.

Delta Connected Alternator – Line Voltage Simulation

Line Voltage of a Delta (Δ) Connected Alternator

Interactive demonstration: in a balanced delta connection, the line voltage is equal to the phase voltage.

Simulation Controls

1. Delta-Connected Alternator

The three phase windings are connected end-to-end. Each winding is directly connected between two line terminals. Therefore: VL = Vph

2. Voltage Measurement

Phase A-B

230 V

Phase B-C

230 V

Phase C-A

230 V
For a balanced Delta connection:
VAB = Vph
VBC = Vph
VCA = Vph

Therefore: VL = Vph

3. Three-Phase Voltage Vector Diagram

The three phase voltages have equal magnitude and are separated by 120° electrical.

VAB = Vph     VBC = Vph     VCA = Vph

4. Delta vs Star