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Unformatted text preview: Z Δ . b) Calculate the real and reactive power at each load and at the source. Do they balance? Why, or why not? n' + + 12 + j9 ( Ω ) 10  j15 ( Ω ) j 2 ( Ω ) n j 2 ( Ω ) j 2 ( Ω ) 120 / 0º (V) 1.5 ( Ω ) 1.5 ( Ω ) 1.5 ( Ω ) Figure 2. Threephase system with Y and Δ connected loads. 4. Figure 3(a) shows a 3 source of 480 (V) linetoline with Load 1 connected. Load 1 is a 3 load that absorbs 150 (kW) at a power factor of 0.7 lagging. Load 2 is then added as shown in Figure 3(b) and it absorbs an additional 50 (kW) and changes the power factor of the total load (Load 1 and Load 2 together to 0.9 lagging). a) What is the power factor of Load 2? b) What is the source current S I ˆ before and after the addition of Load 2? Power System Load 1 I S a) Power System Load 2 Load 1 I S b) Figure 3. Three phase power system with one load connected, then a second load is added....
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 Spring '09
 TimHogan
 Electric power, Power factor, Ω, Threephase electric power

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