Figure 2.26 shows three loads connected in parallel across a 1 000 -V ( RMS ) , 6 0 − Hz single-phase source. Load 1: Inductive load, 125 kVA , 0. 28PF lagging. Load 2: Capacitive load, 1 0 kW , 4 0 kvar . Load 3: Resistive load, 15 kW . (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in μ F . Comment on the magnitude of the supply current after adding the capacitor.
Figure 2.26 shows three loads connected in parallel across a 1 000 -V ( RMS ) , 6 0 − Hz single-phase source. Load 1: Inductive load, 125 kVA , 0. 28PF lagging. Load 2: Capacitive load, 1 0 kW , 4 0 kvar . Load 3: Resistive load, 15 kW . (a) Determine the total kW, kvar, kva, and supply power factor. (b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in μ F . Comment on the magnitude of the supply current after adding the capacitor.
Figure 2.26 shows three loads connected in parallel across a
1
000
-V
(
RMS
)
,
6
0
−
Hz
single-phase source.
Load 1: Inductive load,
125 kVA
,
0.
28PF
lagging.
Load 2: Capacitive load,
1
0
kW
,
4
0
kvar
.
Load 3: Resistive load,
15
kW
.
(a) Determine the total kW, kvar, kva, and supply power factor.
(b) In order to improve the power factor to 0.8 lagging. a capacitor of negligible resistance is connected in parallel with the above loads. Find the kvar rating of that capacitor and the capacitance in
μ
F
.
Comment on the magnitude of the supply current after adding the capacitor.
A 4-cell reuse cellular system is being rolled out into an operation area and you are the engineer taking charge of this project. The subscriber density for the operation area is 600 people per km2. The average traffic load generated per subscriber is 0.2 Er. You are required to deploy 8 clusters of cells in the operation area and provide a Grade of Service of 0.5% to the subscribers using the blocked calls cleared model. You found out that the total number of trunk channels available to the system is 140. Assuming that fixed channel assignment is used, compute:
a) The traffic load that can be offered to the operation area.
b) The size of the operation area (in km2) that can be supported by the system.
c) The proposed cell area and radius, based on the operation area determined in part (b).
Having successfully implemented the first system above, you are now tasked to implement another system. The requirement is that, this second system must have a cluster size of 7 and provides a…
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