Short Time Voltage Variations Analysis for the new Brazilian Distribution Procedures (PRODIST) and for the IEC 61000-4-30

Abstract

This paper presents the analysis of one important requirement of the new Brazilian regulation of Power Quality. The Electric Distribution Procedures (PRODIST), that includes power quality regulation, stipulates the references and methods of measurements to the Electrical Utilities that soon will become a standard that will have limits that must be achieved. The main target of this paper is to compare and propose a specific calculus methodology for a Power Quality Analyzer to precisely identify the amplitude and duration of Short Time Voltage Variations requested in the PRODIST. The PQ Analyzer complies PRODIST technical specifications and the International Standard IEC61000-4-30 for some aspects that PRODIST is not clear. The weak points that are not specified in the PRODIST are also analyzed, showing that they should be more precise, otherwise if different manufactures choose distinct methods, procedures and algorithms, they will not reach the same results. Therefore, power quality measurements could not be compared using equipment of different manufacturers.