Evolution of structural properties of glass-mica-epoxy insulations along accelerated thermo-oxidative aging

2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena Pub Date : 2008-10-01 DOI:10.1109/CEIDP.2008.4772842

V. Boucher, P. Rain, G. Teissèdre, P. Schlupp

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引用次数: 3

Abstract

The stator windings of large air-cooled rotating machines are insulated with mica-glass fabric impregnated with epoxy. These composites are submitted to thermal, mechanical and electrical stresses. A specific aging arrangement has been setup allowing artificial thermo-oxidative aging of dielectric samples thanks to the application of a dry O2 pressure at a controlled temperature. Two different materials are considered: a class H material, designed to sustain temperatures up to 180degC, and a high conductivity (HC) tape material, which is a class F insulation. The samples were followed in mass and DMA (dynamic mechanical analysis). Similar profiles of mass evolution with various temperature and oxygen pressure contribute to validate the artificial aging procedure. DMA allowed determining the glass transition temperature (Tg) of the epoxy resin and observing the evolution of the network density of the polymeric matrix along aging. Delaminations of a few tens mum thick were observed within the samples after aging. These characterizations allowed the comparison between both materials.

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玻璃云母-环氧树脂绝缘体结构性能随加速热氧化老化的演变

大型风冷旋转机械的定子绕组用浸渍环氧树脂的云母玻璃织物绝缘。这些复合材料承受热、机械和电应力。由于在受控温度下施加干氧压力，已经建立了一种特定的老化安排，允许电介质样品的人工热氧化老化。考虑两种不同的材料:H类材料，设计用于维持高达180摄氏度的温度，以及高导电性(HC)胶带材料，这是F类绝缘。对样品进行了质量和动态力学分析。在不同温度和氧气压力下的相似质量演化曲线有助于验证人工老化过程。DMA可以测定环氧树脂的玻璃化转变温度(Tg)，并观察聚合物基体的网络密度随老化的演变。时效后，在样品中观察到几十毫米厚的分层。这些特性使得两种材料之间的比较成为可能。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2008 Annual Report Conference on Electrical Insulation and Dielectric Phenomena

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