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首页> 外文期刊>IEEE Transactions on Dielectrics and Electrical Insulation >Lifetime prediction of HV silicone rubber insulators based on mechanical tests after thermal ageing
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Lifetime prediction of HV silicone rubber insulators based on mechanical tests after thermal ageing

机译：基于热老化后力学测试的高压硅橡胶绝缘子寿命预测

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摘要

In this paper, polydimethylesiloxane (PDMS) as a candidate for high voltage insulation applications is investigated as to the aging behavior at different temperatures in air. Three models according to ISO 11346, to Gillen et al, and to Hoang and Lowe were applied to determine endurance limits in terms of a time-to-failure after aging in hot air. Aging was performed in air from 150 to 170u000b0;C. Tensile tests were performed on unaged and aged PDMS specimens at ambient temperature using strain-to-break values as a performance indicator for the degree of aging. For PDMS, the effects of aging were found to depend strongly on the aging conditions. The activation energies and corresponding lifetime predictions for the chosen temperature range derived from these models are compared and interpreted as to their practical relevance. As a measure of the endurance limits, the decrease in strain-to-break to 50%, of the value of the unaged reference state was applied. Data used for the various models indicate that although all three methods are based on Arrhenius behavior, different lifetimes can be deduced. Despite all the differences, Gillen and ISO approach seems to give more reliable trends in lifetime than the H and L method.
机译：在本文中，研究了聚二甲基硅氧烷（PDMS）作为高压绝缘应用的候选材料，以研究在空气中不同温度下的老化行为。根据ISO 11346，Gillen等人以及Hoang和Lowe的三个模型，根据热空气中老化后的失效时间来确定耐久性极限。老化是在150至170u000b0; C的空气中进行的。在室温下对未老化和老化的PDMS标本进行拉伸测试，使用断裂应变值作为老化程度的性能指标。对于PDMS，发现老化的影响很大程度上取决于老化条件。从这些模型得出的所选温度范围内的活化能和相应的寿命预测将进行比较并解释为它们的实际相关性。作为耐久极限的度量，应用了将应变断裂的强度降低至未老化参考状态值的50％。用于各种模型的数据表明，尽管所有这三种方法都是基于Arrhenius行为，但可以推断出不同的寿命。尽管存在所有差异，但Gillen和ISO方法似乎比H和L方法在寿命方面给出了更可靠的趋势。

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