Each delta branch sees a line voltage equal to +Vdc, zero or −Vdc. Over a cycle its nonzero total duration is 240°, so its rms voltage squared is (2/3)Vdc².
There are three equal branch resistors, hence $P=3[(2/3)600^2]/30=24000$ W.
Thus total load power is **24 kW**, within 23–25 kW.
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