Engineering Board Exam Reviewer · Three-Phase Systems in Power Applications · medium
A balanced wye-connected load, with Z=15+j20, in each phase, is supplied from a three-phase line of 480 V (line-to-line, rms). Find the total reactive power of the load.
- 9.22 kvar
- 5.53 kvar
- 7.37 kvar
- 14.7 kvar
Answer
C. 7.37 kvar
Solution
Vph=VL/ 3= 480 V 3=277 V and |Z|=25, . IL=11.1 A. Q=3I2X=3(11.1 A)2(20, )=7.37 kvar.
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