Electronic equipment dielectric and thermal withstand capability curves for refunding analysis purposes

Gondim, Isaque N.; Tavares, Carlos Eduardo Moreira; Barbosa, J. A. F.; Oliveira, José Carlos de; Delaiba, Antônio Carlos; Mendonça, M. V. B.

doi:10.1109/epqu.2011.6128812

Cited by 5 publications

(5 citation statements)

References 1 publication

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“…In line with the procedures that guided the reimbursement software application , Figure expresses the final result of the dielectric thermic stress correlation imposed by the disturbance with the supportability limits of the microcomputer. It is here worth noting that if this network phenomenon causes stress below the corresponding supportability curve, then an operational condition without probabilistic risks of damage will have occurred, otherwise a limit violation would be manifest . However, the information offered in Figure indicates the possibility of casual nexus for the reimbursement request evaluated herein.…”

Section: Case Study Of Reimbursement Analysismentioning

confidence: 93%

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Grounding system models for computational reimbursement analysis due to electrical damage: state of the art, proposal and performance evaluation

Almeida

Rezende

Gondim

et al. 2015

Int. Trans. Electr. Energ. Syst.

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Summary This paper presents results from computational studies associated with the influence of grounding system representations used in distribution networks during the occurrence of electrical disturbances and damage to electrical appliances. The paper summarizes the main models proposed in the literature for the representation of grounding systems, considering the linearity and non‐linearity of such, and proposes an alternative strategy for the incorporation of grounding studies targeting the causal nexus between the system occurrence in the distribution electrical networks and damage to consumer's equipment. Comparative computational analyses between the given and proposed models are carried out based on information derived from real site experiments. This supports the evaluation of the improvement in quality of the results between the responses of known models and the modified strategy established in this work. To highlight the overall methodology and its application, a reimbursement computational study is performed to illustrate the effect of the grounding models on the results. This is related to the incidence of a lightning strike and its impact on a microcomputer, allegedly damaged by the phenomenon referred to herein. The results show clearly the importance of using appropriate models, not only for network components but also for the grounding systems. Copyright © 2015 John Wiley & Sons, Ltd.

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Section: Case Study Of Reimbursement Analysismentioning

confidence: 93%

“…However, the information offered in Figure 12 indicates the possibility of casual nexus for the reimbursement request evaluated herein. As one can see, for both grounding modelling situations, there are indications of violations of the pre-established dielectric supportability limits [4,20,21].…”

Section: Situation 2-modified Non-linear Modelmentioning

confidence: 99%

Grounding system models for computational reimbursement analysis due to electrical damage: state of the art, proposal and performance evaluation

Almeida

Rezende

Gondim

et al. 2015

Int. Trans. Electr. Energ. Syst.

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“…Among the tested equipment, the one with the lowest withstand was damaged only with voltages higher than 2.0 pu after 46 cycles. Similarly, the study presented in [19] performed withstand tests on different domestic appliances, such as refrigerators, freezers, washing machines, and air conditioning units. The results showed that the equipment with the lowest withstand (washing machine) was damaged only when subjected to a voltage with an amplitude of 1.4 pu for 10 seconds.…”

Section: A Autotransformermentioning

confidence: 99%

A Novel Switching Methodology for Low Voltage Static Regulators

Lima

Macedo

2022

IEEE Access

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This paper presents a new switching methodology for low voltage static regulators. The switching method proposed in this paper differs from those found in the literature due to it not needing a measurement of the current signal in the transformer tap windings and/or in the static switches. This method simplifies the control, reduces the cost of implementation, and allows safe application onto grids with low loading and high harmonic current distortion. In order to analyze and evaluate the performance of the proposed methodology, the static voltage regulator presented in this article was implemented in a computer simulation and, later, a laboratory prototype was built. The topology, the operational principles, and the specifications of its constituent components are discussed and presented in this paper. In addition, the prototype of the equipment was tested under three different load conditions: operating under no-load conditions, supplying a purely resistive load and supplying a nonlinear load. For each of the three types of loads considered, the static voltage regulator's performance was evaluated using specific measurements, which considered the occurrence of both long and short duration voltage variations imposed on the input of the equipment by a programmable power source. The obtained results show that-in the worst-case scenario-the tap changing process takes less than 4 cycles of the fundamental frequency to be concluded. In light of the obtained performance, the proposed switching methodology for low voltage static regulators is a promising solution for large scale use under varied applications.INDEX TERMS Static voltage regulator, on-load tap changing, long duration voltage variations, short duration voltage variations, power quality.

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“…No que se refere aos limites térmicos, tais considerações não são possíveis de serem feitas visto a inexistência de referências que permitam tal correlação. Exceção se faz quando se considera [8], a qual utiliza como tolerâncias térmicas os valores previstos para os diodos que compõem as fontes chaveadas dos equipamentos. Feita tal ressalva, a Figura 20 permite uma pronta visualização dos limites obtidos neste artigo e aquele vinculado com o I 2 t encontrado em catálogos de diodos.…”

Section: ) Microcomputadoresunclassified

“…Muito embora os autores tenham apresentado em [7] alguns dos resultados aqui considerados, vale lembrar que esta publicação ficou atrelada tão somente à apresentação de resultados práticos finais, sem maiores detalhamentos quanto: a caracterização da metodologia, formulação matemática para os limites dielétricos e térmicos, obtenção de bancos de dados e respectiva correlação com os requisitos das expressões. Somado a tais avanços, o trabalho em pauta ainda oferece, por fim, ao estabelecimento de termos comparativos com os padrões de suportabilidade tradicionalmente disponibilizados [5], [8].…”

Section: Introductionunclassified

Uma Estratégia para Obtenção dos Limites de Suportabilidade Dielétrica e Térmica de Equipamentos com Foco aos Pedidos de Indenização por Danos

Gondim¹,

Barbosa²,

Oliveira³

et al. 2012

Revista Eletrônica de Potência

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Resumo-O presente artigo contempla o estabelecimento de procedimentos destinados à obtenção de expressões matemáticas para os limites de suportabilidade dielétricos e térmicos para equipamentos eletroeletrônicos, informações estas relevantes para os processos de análise de pedidos de indenização por danos elétricos. Os trabalhos encontram-se centrados em aparelhos televisores, de som e microcomputadores e envolvem uma estratégia laboratorial para realização de ensaios, à nível destrutivo, para a extração de informações requeridas pelos modelos propostos. Tais resultados encontram-se em consonância com os requisitos impostos pelos processos de análise, computacionais ou não, da consistência dos nexos causais entre distúrbios manifestados nas redes e eventuais danos físicos ocorridos nos produtos. A aplicabilidade do processo e dos resultados se justifica pelos crescentes interesses para a implementação de procedimentos sistematizados ao processo decisório dos requerimentos de indenização. Os resultados obtidos são, por fim, correlacionados com propostas atualmente disponibilizadas pela literatura.

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Electronic equipment dielectric and thermal withstand capability curves for refunding analysis purposes

Cited by 5 publications

References 1 publication

Grounding system models for computational reimbursement analysis due to electrical damage: state of the art, proposal and performance evaluation

Grounding system models for computational reimbursement analysis due to electrical damage: state of the art, proposal and performance evaluation

A Novel Switching Methodology for Low Voltage Static Regulators

Uma Estratégia para Obtenção dos Limites de Suportabilidade Dielétrica e Térmica de Equipamentos com Foco aos Pedidos de Indenização por Danos

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