AVALIAÇÃO METROLÓGICA DE VARISTORES DE ÓXIDO DE ZINCO PARA MÉDIA TENSÃO / METROLOGICAL EVALUATION OF ZINC OXIDE VARISTORS OF MEDIUM VOLTAGE
AUTOR(ES)
FERNANDO ANTONIO TUPINAMBA BARBOSA
DATA DE PUBLICAÇÃO
2004
RESUMO
Despite its many benefits, one of the few disadvantages of semiconductor technology is the vulnerability of solid state devices to undesired increase in temperature, voltage and current . Even low voltage pulses can produce interference and damages with several consequences. Thus, as electronics are used in more and more applications, temperature, protection against surge and transient suppression are becoming factors of decisive importance in projects. Varistors have proven to be excellent protective devices due to their flexibility in applications and heightened trustworthiness. The zinc oxide varistors (ZnO) are state of the art electronic devices of last generation, developed to promote the protection of electric circuits against overvoltage, caused by atmospheric electric discharges, induced voltages and electric maneuvers, and suited to limit peak current, as well as absorbing energy. The purpose of this work is to propose a methodology for experimental characterization of zinc oxide varistors of average voltage, with the purpose of guarantee the attendance of the metrological requirements for protection of electric, electronic and telecommunication circuits against transient surges and suppression of electric transients. Uncertainty of measurement of the parameters temperature, voltage, current and ohmic resistance on commercial samples of zinc oxide varistors are also determined.
ASSUNTO(S)
varistor corrente supressor de transiente temperature metrological evaluation current surge transient suppression sobretensao uncertainty varistor metrologia tensao resistencia ohmica incerteza temperatura tension metrology avaliacao metrologica ohmic resistance
ACESSO AO ARTIGO
Documentos Relacionados
- Desenvolvimento de varistores à base de SnO2 para aplicação em redes de alta tensão = Development of SnO2-based varistors for high voltage application
- CONTRIBUTIONS ON THE METROLOGICAL EVALUATION OF SATURATED STEAM STERILIZERS
- Silicon nanocrystals and zinc oxide nanowires with erbium
- METODOLOGIA PARA AVALIAÇÃO METROLÓGICA DE CARACTERÍSTICAS DE UM TERMISTOR PTC POLIMÉRICO REGENERATIVO
- AVALIAÇÃO METROLÓGICA DE PROCEDIMENTOS DE QUALIFICAÇÃO E ACEITAÇÃO DE BATERIAS PARA SISTEMAS FOTOVOLTAICOS