Q5. The one-line diagram of a three-phase power system is shown in Figure 1. Select a common base of 100 MVA and 22 kV on the generator side. Draw an impedance diagram with all impedance marked in pu. The three-phase load at bus 4 absorbs 57 MVA, 0.6 power factor lagging at 10.45 kV. Line 1 and line 2 have reactance of 48.4 Q and 65.43 Q, respectively. T1 Т 3 1 4 Line 1 220 kV G M T3 T4 38 Line 2 Load 110 kV Fig. 1. Single line diagram of a power network. The reactances of the different devices are given as G: 90 MVA 22 kV T1: T2: T3: T4: M: X = 18 % X = 10 % X = 6.0 % X = 6.4 % X = 8.0 % X = 18.5 % 50 MVA 22/220 kV 40 MVA 220/11 kV 40 MVA 22/110 kV 110/11 kV 40 MVA 66.5 MVA 10.45 kV
Short Transmission Line
A short transmission line is a transmission line that has a length less than 80 kilometers, an operating voltage level of less than 20 kV, and zero capacitance effect.
Power Flow Analysis
Power flow analysis is a topic in power engineering. It is the flow of electric power in a system. The power flow analysis is preliminary used for the various components of Alternating Current (AC) power, such as the voltage, current, real power, reactive power, and voltage angles under given load conditions and is often known as a load flow study or load flow analysis.
Complex Form
A power system is defined as the connection or network of the various components that convert the non-electrical energy into the electric form and supply the electric form of energy from the source to the load. The power system is an important parameter in power engineering and the electrical engineering profession. The powers in the power system are primarily categorized into two types- active power and reactive power.
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