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Examoogle • User • info@examoogle.com • EE-2024-8821
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The line voltage of a delta connected three phase circuit is 415 V. The phase voltage is:
415 V
230 V
240 V
220 V
415 V
In a delta (Δ) connected system, the phase winding is connected directly across the line conductors. Consequently, the phase voltage is equal to the line voltage.
IS 1248-1:2003
In a delta (Δ) connected system, the phase winding is connected directly across the line conductors. Consequently, the phase voltage is equal to the line voltage.
Vph=VL — Phase voltage equals line voltage in Delta connection
IL=3Iph — Line current equals 3 times phase current in Delta connection
In the delta configuration, each phase load or winding is connected between two line terminals. Thus, the potential difference across any phase is identical to the potential difference between the corresponding lines.
Delta connection is primarily used for industrial power distribution and heavy loads.
The phase voltage (Vph) is defined as the voltage across a single phase winding.
The line voltage (VL) is defined as the voltage between any two line conductors.
Provides a balanced distribution of load.
Eliminates the requirement for a neutral conductor for balanced loads.
Higher line currents for the same phase current compared to Star connection.
Requires proper winding insulation for full line voltage.
Three-phase industrial motors.
Power transmission networks.
Option B (230 V) is the phase voltage of a Star (Wye) connected system where VL=3Vph (415/3≈240 V).
In India, standard low voltage supply is 415 V (Phase-to-Phase) and 240 V (Phase-to-Neutral).
A is correct — In a delta connected system, the phase voltage Vph is equal to the line voltage VL because each phase is connected directly between two lines.
Always identify the connection type first. Remember: Delta (VL=Vph) and Star (VL=3Vph).
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