Article_herra Distorted voltage and current waveforms is one of

the problems associated to electric power quality. Continuous

use of non-linear loads provokes the existence of voltage

waveforms with a high distortion. Thus, it is necessary to know

the responsible of this problem by means of the commonly

named distortion sources identification. In this paper, the

problem is analyzed through the harmonic power sign, with the

objective of knowing the sense of harmonic power flow

between source and one load in distorted systems. Nowadays, it

has already been established in the Literature that an analysis of

this kind does not solve the problem. Recently, new indices

have been introduced to evaluate a specific consumer distortion

level. In this paper, a comparative analysis of these indices is

carried out, having as reference a practical case. The results

obtained show that, in fact, these indices can help to valuate the

harmonic distortion, although none of them solve the question

definitively