Delta Winding Configuration
In a delta (Δ) configuration, every phase winding is connected in a loop, with line conductors connecting at the junctions between windings. This means that the line voltage is measured over the entire winding, whereas the phase voltage is measured for each individual winding.
In a delta-connected winding, the windings are arranged in a triangle pattern, with one end of each winding connected to one end of the other two.
Key Parameters
- Line Voltage (V_L) is the voltage measured across any 2 line conductors.
- Phase Voltage (V_Ph) is the voltage determined across a single delta winding.
Converting Phase Voltage to Line Voltage
To convert phase voltage (Vph) to line voltage (Vline) in a delta connection, use the formula
Vline = √3 × Vph
This is because the line voltage is the phasor sum of the voltages across two series-connected phases.
Converting Line Voltage to Phase Voltage
To convert line voltage (Vline) to phase voltage (Vph) in a delta connection, use:
Vph = Vline / √3
In a delta connection, the line voltage is divided by √3 and applied to each phase winding.
Practical Example
Assume the delta-connected system has a phase voltage (Vph) of 230V.
To determine the line voltage (Vline), we use:
Vline = √3 x Vph
Vline = √3 x 230V
Vline = 398.4V
To calculate the phase voltage, use the formula Vph = Vline / √3. For example, if the line voltage is 400V, the phase voltage would be 230.9V.
To convert phase & line voltages in a delta connection, multiply the phase voltage by √3, or divide the line voltage by √3.