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This paper aims to evaluate the performance of commercial power quality meters. By using a high precision programmable voltage and current source, several meters are analyzed and compared. At first, At first, distorted three-phase voltage signals are applied to several kinds of PQ instruments, considering harmonics, sags, swells, as well as unbalanced voltages. Next, the features of these events are...
An important alteration of the equivalent loads profile has been observed in the electrical energy distribution systems, for the last years. Such fact is due to the significant increment of the electronic processors of electric energy that, in general, behave as nonlinear loads, generating harmonic distortions in the currents and voltages along the electric network. The effects of these nonlinear...
This paper aims to model, using the software ATP (Alternative Transient Program), and investigate the use of zigzag autotransformer (ADZ), with control of voltage module and phase shift made independently, as a filter for harmonic currents, specifically in 24-pulse converters. Objective is to preserve the quality of supply in terms of the harmonic distortion. Furthermore, the systematic focus here...
The aim of this paper is to evaluate the design of transformers for feeding non-linear loads. The first analysis is obtained in a theoretical way through the traditional calculations of electrical losses. After that, in an experimental analysis, the addition of losses is obtained for the same condition of current harmonic distortion by measuring the temperature in a transformer prototype. Finally...
The objective of this paper is to present a procedure, experimentally developed, for dimensioning transformers submitted to nonlinear loads conditions. The method is based on the record of the heating curve of the electrical equipment. First of all, the increase of losses in transformers is obtained for several situations of current distortion in transformer windings. Moreover, the increase of losses...
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