While the instantaneous electric power delivered by a single

While the instantaneous electric power delivered by a single-phase generator under balanced steady-state conditions is a function of time having two components of a constant and a double-frequency sinusoid, the total instantaneous electric power delivered by a three-phase generator under balanced steady-state conditions is a constant. True False An ideal transformer has no real or reactive power loss. True False For large power transformers rated more than 500 kVA, the winding resistances, which are small compared with the leakage reactances, can often be neglected. True False Consider the adopted per-unit system for the transformers. For the entire power system of concern, the value of S_base is not the same. True False .For balanced three-phase systems, Z_base is given by V^2_bsee LN/S_base 3 True False Shield wires located above the phase conductors protect the phase conductors against lightning. True False AC resistance is higher than dc resistance. True False Bundling reduce the scries reactance of the line. True False

Solution

19. True

20. True

21. True

22. False. Sbase is same for the entire power system

23. False. Zbase = (Vbase 3ph)^2 / VA base 3ph

24. True

25. True . AC resistance is ~0.02% to ~5% higher than DC resistance

26. True. Bundling reduces the series reactance of the line byincreasing the GMR of the bundle.