REET 425 WEEK 3 HOMEWORK / ELECTRIC MACHINES AND POWER SYSTEMS WITH LAB
REET 425 Week 3 Homework Answers (DeVry)
2–7.Why does the short-circuit test essentially show only i2R losses and not excitation losses in a transformer?
2–8.Why does the open-circuit test essentially show only excitation losses and not i2Rlosses?
2–11.What are transformer taps? Why are they used?
2–3.Consider a simple power system consisting of an ideal voltage source, an ideal step-up transformer, a transmission line, an ideal step-down transformer, and a load. The voltage of the source is VS= 480∠0 V. The impedance of the transmission line isZline=3 +j4, and the impedance of the load is Zload=30+j40.
2–6. A 1000-VA, 230/115-Vtransformer has been tested to determine its equivalent circuit. The results of the tests are shown below.
Comments
Post a Comment