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In this paper, a new method is proposed for the estimation of time to failure percentiles and life fraction lost in the so-called “Extension of pre-Qualification (EQ) test” according to CIGRE TBs 303. The method accounts for the time-varying temperature during the EQ load cycles via an approach that relies on: 1) Miner's law of cumulated aging; 2) an improved voltage-time characteristic that includes...
The use of a built-in test equipment (BITE) that is able to provide a real-time diagnostic of a monitored device allows increasing reliability and decreasing costs. The BITE operation can be based on a suitable life model of the device that must relate the time to failure to the “stress history” of the component. The life model is developed by exploiting the results of a proper measurement campaign...
This paper deals with a life model for low voltage polyester-insulated capacitors subjected to time-varying temperature. The results of accelerated life tests performed on low voltage polyester-insulated capacitors at various temperatures are illustrated and from them a constant-temperature life model is derived. Such model, inserted within a “Miner's law” framework, gives rise to a variable-temperature...
The use of an equipment able to provide a real time diagnostic of a monitored device (BITE) allows to increase reliability and to decrease costs. BITE operates on the basis of a suitable life model of the considered device that must relate time to failure with past and present stresses. Model development can be carried out by exploiting the results of a proper measurement campaign. In this paper,...
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