IEVref:221-03-42ID:
Language:enStatus: Standard
Term: (magnetic) total harmonic distortion
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Symbol: THD
Definition: distortion of voltage waveform caused by a non-linear relation between the magnetic flux density and the magnetic field strength in the magnetic core and expressed in decibels by:

THD = 20 lg(Vm/Vf) dB

where

V m = ∑ n=1 ∞ V n 2 MathType@MTEF@5@5@+=feaagCart1ev2aqatCvAUfeBSjuyZL2yd9gzLbvyNv2CaerbbjxAHXgaruavP1wzZbItLDhis9wBH5garmWu51MyVXgarqqtubsr4rNCHbGeaGqipG0dh9qqWrVepG0dbbL8F4rqqrVepeea0xe9LqFf0xc9q8qqaqFn0lXdHiVcFbIOFHK8Feea0dXdar=Jb9hs0dXdHuk9fr=xfr=xfrpeWZqaaeaaciWacmGadaGadeaabaGaaqaaaOqaaiaadAfadaWgaaWcbaGaciyBaaqabaGccqGH9aqpdaGcaaqaamaaqahabaGaamOvamaaDaaaleaacaWGUbaabaGaaGOmaaaaaeaacaWGUbGaeyypa0JaaGymaaqaaiabg6HiLcqdcqGHris5aaWcbeaaaaa@4186@

Vn is the amplitude of the n-th harmonic component of the waveform and Vf is the amplitude of its fundamental component


Publication date:2007-04
Source
Replaces:
Internal notes:2016-01-05: <i>V</i><sub>t</sub> corrected to <i>V</i><sub>f</sub> in conformity with the standard. JGO
2012-01-15: German term corrected in accordance with mail received from Anne Seeger DKE 2015-01-14. JGO
2017-02-27: <i>V</i><sub>n</sub> corrected to <i>V</i><sub><i>n</i></sub>. See mail exchange with RS and JS 2016-01. JGO

2017-06-02: Cleanup - Remove Attached Image 221-03-41.gif
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