IEEE standard 519 was first released in 1982 and was then updated in 1992. It defines limits on total harmonic distortion (THD) as well as total demand distortion (TDD) with regards to both voltage and current.
These distortions are typically introduced into utility lines through non-linear loads installed in various types of manufacturing facilities. Such equipment consists of variable frequency drives, uninterruptible power supplies, and other types of rectifiers used to convert power from AC to DC.
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