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The voltage between any phase and neutral of a 400 V, 3 phase, 3 wire system is
230 V
110 V
400 V
250 V
230 V
In a balanced three-phase star (wye) connected system, the line voltage is related to the phase voltage by a factor of 3тАЛ. For a 400 V (line-to-line) supply, the phase-to-neutral voltage is calculated as VphaseтАЛ=3тАЛVlineтАЛтАЛ, which results in approximately 230 V.
In a balanced three-phase star (wye) connected system, the line voltage is related to the phase voltage by a factor of 3тАЛ. For a 400 V (line-to-line) supply, the phase-to-neutral voltage is calculated as VphaseтАЛ=3тАЛVlineтАЛтАЛ, which results in approximately 230 V.
VLтАЛ=3тАЛ├ЧVPтАЛ тАФ Relation between line and phase voltage in star connection
VPтАЛ=3тАЛVLтАЛтАЛ тАФ Calculation of phase-neutral voltage
In a 3-phase, 4-wire or grounded star system, the line voltage (VLтАЛ) represents the potential difference between two lines, while the phase voltage (VPтАЛ) is the potential difference between any single line and the neutral point. Because the phase voltages are displaced by 120┬░ electrical, the phasor difference between any two lines results in the 3тАЛ multiplier.
The 400 V rating in a 3-phase system refers to the line-to-line voltage (VLтАЛ).
The neutral point is the common junction in a star-connected winding.
Standard domestic supply in India utilizes this 230 V phase voltage for single-phase appliances.
Allows utilization of both single-phase (230 V) and three-phase (400 V) loads.
Provides a stable reference point (neutral) for grounding and protection.
Requires an additional conductor (neutral) for unbalanced loads.
Potential for neutral shifting if the load is severely unbalanced and neutral is not robust.
Low voltage distribution networks.
Industrial and residential electrical supply.
In a delta connection, there is no physical neutral point accessible for 230 V loads.
Calculation: 400/1.73205=230.94V, which is standardized to 230 V.
A is correct тАФ The phase voltage is the line voltage divided by the square root of 3, resulting in 230 V.
Always verify if the system is Star or Delta; Delta systems do not have a neutral wire and cannot directly provide phase-to-neutral voltage.