Power quality is a measure of the electrical network or grid to provide "clean" and stable power. A characteristic of good electric power quality is the steady voltage supply where the frequency of the supply remains close the rated value.
Here is a depiction of a typical power quality application:
L1: PFC Inductor
L2: PFC Inductor
L3: EMI Filter
T1: Current Sense Transformer
T2: Current Sense Transformer
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