Identification of harmonic sources

The paper deals with the possibility of identifying harmonic sources on the basis of on-site measurements, analysing the change of operating point on different type characteristics due to sudden changes utilising the method of monoparameter variation in a multiparameter system. The method and it's verification is based on the results of numerous on-site measurements performed and evaluated by the authors using TRANSANAL-16, a 16-channel multifunction power quality analyser. The software features of the equipment allow a wide-scale evaluation regarding any kind of function in the form of plots. As is proved the identification of harmonic sources and their disturbing effect can be determined evaluating the results of measurements in a proper way.