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The monitoring of partial discharges (PDs) is one of the main methods used worldwide for evaluation and diagnosis of the insulation conditions in equipment powered by medium and high voltages. The occurrence of PDs is usually an indication of the appearance of insulation defects, which over time can compromise the dielectric withstand of the material used, increasing the probability of complete breakdown. In general, laboratory tests for detecting and registering PDs are carried out using purely sinusoidal voltages. However, it is very common for an electrical asset to be subjected at some point in its operating life to voltages distorted by harmonic components. Some studies reported in the literature reveal that harmonic distortions can affect the PDs’ characteristics, nevertheless, the effects of individual harmonic components on PDs still need to be analyzed. In this context, this paper proposes to evaluate the impacts of harmonic voltage distortions on the dynamic behavior and the phase-resolved partial discharge (PRPD) patterns of PDs in an air cavity within a solid dielectric material. For this, a simulation model was implemented, which was used to analyze the effects of applying distorted voltages composed of different harmonic orders (third, fifth, and seventh) and distinct levels of distortion (1%, 3%, 5%, 10%, 15%, and 20%). In addition, the influence of the third harmonic phase angle on PDs is also analyzed. The results extracted from the simulations revealed that the harmonic distortions caused changes in the numbers of PDs per cycle, in the mean apparent charges of the PDs per cycle, and in the PRPD patterns’ characteristics. These changes were very significant for higher distortion levels, which in practice may impair the interpretation of PD measurement records for the diagnosis of the condition of the insulation system.

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Este artigo relata resultados de uma pesquisa no contexto das possibilidades de geração distribuída. Uma estratégia para injetar potência ativa na rede de alimentação é discutida e testada. A energia proveniente de uma fonte mecânica é convertida em energia elétrica utilizando um Gerador a Relutância Variável. A tensão gerada alimenta um barramento CC e é controlada em malha fechada. Um conversor CC-CA faz a interface do gerador com uma rede elétrica monofásica, onde o sincronismo é obtido através de Phase Locked Loop (PLL). O fator de potência unitário é alcançado com uma malha de controle da corrente injetada por meio de um controlador Proporcional Ressonante (P+RES). A Modelagem matemática dos elementos do sistema apresentado é utilizada na simulação de todo o conjunto. A montagem experimental utilizada para testes de bancada é descrito. Resultados simulados e experimentais são discutidos, comparados e mostram a viabilidade da proposta.

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