Engineering Board Exam Reviewer · Three-Phase Systems in Power Applications · medium
A balanced delta-connected load, with Z=6+j8, in each phase, is supplied from a three-phase line of 400 V (line-to-line, rms). Find the total real power absorbed by the load.
- 9.6 kW
- 28.8 kW
- 48 kW
- 57.6 kW
Answer
B. 28.8 kW
Solution
In a delta connection each phase impedance sees the full line voltage: Iph=VL/|Z|= 400 V10, =40 A. P=3Iph2R=3(40 A)2(6, )=28.8 kW.
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