Q 2) The single-line diagram of a three-phase system is shown in Fig. 1. Using the common base Sp = 50 MVA, draw the impedance diagram in per unit including the load impedance. The manufacturer's nominal ratings are given as follows: Bus O Bus 2 Line 1 T2 Line 2 Line 3 Bus 3 T3 Bus @ Load Device (LL)n Generator G,: 48 MVA 20 kV 20% Generator G,: 25 MVA 13.8 kV 15% Transformer T1: 50 MVA 20/110 kV 8% Transformer T2: 30 MVA 13.8/110 kV 6% Transformer T3: 50 MVA 11/110 kV 10% The three-phase load at bus 4 absorbs 60 MVA at 0.75 power factor (lagging), and lines 1, 2, and 3 have the reactance of 400, 32 N, and 300, respectively.
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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