Question

Explain how the output power of a turbine-generator operating in a constant

frequency system is controlled by adjusting the setting of the governor. Show the effect on the generator power-frequency curve.

Answer 1

solution:

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avg) if you thought that the single phase arve was complex, look at the three phase power curve Pom fig. at shows the output of. genuato wound in a manner that produces thace separate single phase aus Ves, each separated by 120 electrical degrees. phave 1 begins at Odage Phase begers at facº, phace 3 begons at 24º. from 240° on, all three are conturbuting to the overall power en circuit. To 30 60 9o 120 150 180 210 240 270 360 330/360 one big advantage of three phase power has over single phase e power is the fact that, at any given point in time, one of the three phase is nearing a peak, & there is never more than one phase at zero, a you look at one cycle of phage ?, you will note that wave crosses Zelo volls.

twice during its cycle. It also spends about one third of Ifs time below 50% of peak voltage. Although single phane can be mele than adequate for low power applications it becomy problewale as the demand A power in trages you will find that relationship holds true at any poput ou the X-a 206. Two phases will also reduce this äeroing effect but not really as well as three phases. Four phase would not improve things séquilicantly & would add the expense of a fourth wire, so three phone was the neutral settling point

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