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Recent Posts Tagged With 'polyphase ac circuits'
Harmonic phase sequences
In the last section, we saw how the 3rd harmonic and all of its integer multiples (collectively called triplen harmonics) generated by 120o phase-shifted fundamental waveforms are actually in phase with each other. In a 60 Hz three-phase power syst...
Harmonics in polyphase power systems
In the chapter on mixed-frequency signals, we explored the concept of harmonics in AC systems: frequencies that are integer multiples of the fundamental source frequency. With AC power systems where the source voltage waveform coming from an AC gene...
Three-phase transformer circuits
Since three-phase is used so often for power distribution systems, it makes sense that we would need three-phase transformers to be able to step voltages up or down. This is only partially true, as regular single-phase transformers can be ganged to...
Three-phase Y and configurations
Initially we explored the idea of three-phase power systems by connecting three voltage sources together in what is commonly known as the “Y” (or “star”) configuration. This configuration of voltage sources is characterized by a common conne...
Polyphase motor design
Perhaps the most important benefit of polyphase AC power over single-phase is the design and operation of AC motors. As we studied in the first chapter of this book, some types of AC motors are virtually identical in construction to their alternator...
Phase rotation
Let's take the three-phase alternator design laid out earlier (Figure below) and watch what happens as the magnet rotates. Three-phase alternator The phase angle shift of 120o is a function of the actual rotational angle shift of th...
Three-phase power systems
Split-phase power systems achieve their high conductor efficiency and low safety risk by splitting up the total voltage into lesser parts and powering multiple loads at those lesser voltages, while drawing currents at levels typical of a full-voltag...
Single-phase power systems
Single phase power system schematic diagram shows little about the wiring of a practical power circuit. Depicted above (Figure above) is a very simple AC circuit. If the load resistor's power dissipation were substantial, we might call thi...
