Search for disturbing loads in power network with the use of voltage and current fluctuation

The paper discusses a set of the most frequently used measures of voltage fluctuation, which are useful in searching for disturbing loads. A procedure appropriate for searching the loads causing voltage fluctuation is proposed. The procedure utilizes two measures of fluctuation: Pst indicator as well as minimal and maximal values of voltages and currents. An analysis is included of four exemplary measuring results, recorded in a LV network. The effect of this analysis is a conclusion whether a disturbing load appears or not. The first Example illustrates the state in which it was possible to designate a disturbing load. The other Example shows a situation in which an unequivocal conclusion is impossible. In Examples 3 and 4 it was found that the loads under investigation are not dominant sources of voltage fluctuation. By means of the hereby analysis of measurement data the authors prove the diagnostic potential of the proposed procedure for searching for disturbing loads