(b) An unbalanced 4 wire star connected load consisting of the phase impedances ZRS (15+j5)2, Zrs (10+j0)2 and ZBs (18-j6)N is connected to a 3-phase, 440V, 50HZ supply. Draw the circuit diagram including the implementation of a 2 wattmeter power measurement and from this: (i) (ii) Calculate the 3 line currents (IR, IY and IB). Construct a scaled phasor diagram and using this or otherwise determine the star/neutral current IsN. Include VRY and VRB on the phasor diagram. Calculate the necessary wire diameter for the star/neutral connection to achieve a current density of 3A/mm2. (iii) (c) Determine the total real supply power (W) for Q1(b) based on the 2 wattmeter measurements.
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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