0195136047.pdf

464 AC POWER SYSTEMS

TABLE 10.3.1Load-Bus Data

Quantity Symbol Value

Voltage V 115 kV

Current I 1kA

Apparent power S 220 MVA

Real power P 160 MW

Reactive power Q 120 MVAR

Power factor cosθ 0.8 lagging

Phase angle θ 36.9°

Load impedance Z 66.1

Load resistance R 52.9

Load reactance XL 39.7

TABLE 10.3.2Transmission-Line Data

Quantity Symbol Value

Resistance R 3 

Inductive reactance XL 8 

Series impedance Z 8.5

Series impedance angle θ 69.4°

Real power loss Ploss 9MW

Reactive power loss Qloss 24 MVAR

Voltage drop Vdrop 8.5 kV

TABLE 10.3.3Source-Bus Data

Quantity Load Bus Line Source Bus

Voltage 115 8.5 127.7 kV

Real power 160 9 169 MW

Reactive power 120 24 144 MVAR

Apparent power 200 — 222 MVA

Angle 36.9° — 40.4°

TABLE 10.3.4Load-Bus Data with

Power-Factor Correction

Quantity Symbol Value

Voltage V 115 kV

Current I 0.8 kA

Apparent power S 160 MVA

Real power P 160 MW

Reactive power Q 0MVAR

Power factor cosθ 1

Phase angle θ 0°

Load impedance Z 82.7

Load resistance R 82.7

Load reactance XL 0