Power quality is a measure of the purity of the AC voltage waveform on your local electricity network, the purity can refer to the amplitude and frequency of the voltage as well as its distortion from the fundamental 50 or 60Hz. If should be noted that you as the customer or consumer of energy can adversely affect or change your local voltage purity. You can affect it for you but you can also affect it for your neighbours, as they can for you! In this discussion we will not look at frequency distortion, that is, flicker or harmonics.
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