Build and Simulate Your Three-Phase Power System in CircuitLab Build a balanced

Question

Build and Simulate Your Three-Phase Power System in CircuitLab Build a balanced three-phase power system, with a wye-wye connection and a neutral line, as shown in the figure below.See also the notes in Lecture 19 (the lecture delivered on 20th Oct.) z 19 z The amplitude of each sinusoidal source should be 325V, the frequency 50 Hz, and each phase should be 120 apart. The loads should be balanced, with each load Z made up of a 100 resistor only (and no inductance/capacitance in the load). When simulating the circuit use the "Time Domain simulation and choose an appropriate Time Step" and "Stop Time" in order to clearly see the output waveforms. When selecting the outputs, make sure to select and plot the following waveforms The source voltage in each phase .The current in each load phase .The total power in the system Check that the total power in the system has a constant value before submitting your circuit.

Explanation / Answer

Three-phase generators can be driven by constant force or torque (to be discussed). Industrial applications, such as high-power motors, welding equipments, have constant power output if they are three-phase systems (to be discussed). the generation of single-phase voltage, using a multi-turn coil placed inside a magnet, was described. It may be noted that, the scheme shown was a schematic one, whereas in a machine, the windings are distributed in number of slots. Same would be the case with a normal three-phase generator. Three windings, with equal no. of turns in each one, are used, so as to obtain equal voltage in magnitude in all three phases. Also to obtain a balanced three-phase voltage, the windings are to be placed at an electrical angle of with each other, such that the voltages in each phase are also at an angle of with each other, which will be described in the next section. The schematic diagram with multi-turn coils, as was shown earlier in Fig. 12.1 for a single-phase one, placed at angle of with each other, in a 2-pole configuration, is shown in Fig. 18.1a. The waveforms in each of the three windings (R, Y & B), are also shown in Fig. 18.1b. The windings are in the stator, with the poles shown in the rotor, which is rotating at a synchronous speed of (r/min, or rpm), to obtain a frequency of 120° 120° 120° Ns ( 120/)( ) Npf s = (Hz), p being no. of poles [ p = 2 ]

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