Question

A 3-$\varphi$ bridge inverter delivers power to a resistive load from a 450 V dc source. For a star connected load of $10\Omega /ph$, the rms value of line current if it is operated in 120° conduction mode is

• A. 13.25 A
• B. 12.25 A
• C. 18.37 A
• D. 17.54 A

Answer 1

The correct option is C 18.37 A

$V_{ph\left(rms\right)}=\frac{V_{dc}}{\sqrt{6}}$ volts [for ${120}^o$ conduction mode]

$I_{ph\left(rms\right)}=\frac{V_{dc}}{R\sqrt{6}}=\frac{450}{10\sqrt{6}}=18.37A$