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IEEE 519-2014 Recommended current distortion limits

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IEEE 519-2014 Recommended current distortion limits

Hi there,

In IEEE 519-2014, we can see in §5.2 the recommended current distortion limits for systems nominally rated 120 V through 69 kV which depends on short circuit ration (ISC/IL), these maximum harmonics current distortion are expressed in percent of IL.

For example, for 50 < ISC/IL < 100; 3 ≤ h <11 - HD = 10% and 11≤ h < 17 - HD = 4.5% …. (HD is Harmonic Distortion).

My question is the following: are these harmonic distortion limits found based on calculations (formula) or it’s just empiric values based on experience?