A single-phase power system is shown in Figure 1. The power source feeds a 100-kVA 14000/2400V transformer through a feeder impedance of ZL= 40 + j150 Q. The transformer's equivalent series impedance referred to it s low-voltage side is Zeq2= 0.12 + j0.5 Q. The load on the transformer is 90 kW at 0.85 PF lagging and V, =2200 V. 40Ω 150 Ω 0.120 j0.5N Load 90 kW source 0.85 PF lagging

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A single-phase power system is shown in Figure 1. The power source feeds a 100-kVA
14000/2400V transformer through a feeder impedance of ZL= 40 + j150 . The
transformer's equivalent series impedance referred to it s low-voltage side is Zeq2= 0.12
+ j0.5 2. The load on the transformer is 90 kW at 0.85 PF lagging and V, =2200 V.
40Ω 150 Ω
0.120 j0.5N
Load
|90 kW
0.85 PF lagging
source
Source
Feeder
Transformer
Load
(transmission line)
Fig:1.Network System
1) Calculate the voltage at the power source of the system.
2) Calculate the voltage régulation of the transformer.
3) Calculate the efficiency of the system at rated conditions in%
Transcribed Image Text:A single-phase power system is shown in Figure 1. The power source feeds a 100-kVA 14000/2400V transformer through a feeder impedance of ZL= 40 + j150 . The transformer's equivalent series impedance referred to it s low-voltage side is Zeq2= 0.12 + j0.5 2. The load on the transformer is 90 kW at 0.85 PF lagging and V, =2200 V. 40Ω 150 Ω 0.120 j0.5N Load |90 kW 0.85 PF lagging source Source Feeder Transformer Load (transmission line) Fig:1.Network System 1) Calculate the voltage at the power source of the system. 2) Calculate the voltage régulation of the transformer. 3) Calculate the efficiency of the system at rated conditions in%
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