EM Example 6.3 (Chapman) (English)
Example 6-3. The infinite bus in Figure 6-13 operates at 480 V. Load1 is an induction motor consuming 100 kW at 0.78 PF lagging, and
load 2 is an induction motor consuming 200 kW at 0.8 PF lagging.
Load 3 is a synchronous motor whose real power consumption is 150 kW.
(a) If the synchronous motor is adjusted to operate at 0.85 PF lagging, what is the transmission line current in this system?
(b) If the synchronous motor is adjusted to operate at 0.85 PF leading, what is the transmission line current in this system?
(c) Assume that the transmission line losses are given by
line loss PLL where LL stands for line losses.
How do the transmission losses compare in the two cases?
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