为研究GIS用环氧浇注绝缘件试样在不同温度下的介电松弛特性，采用差示扫描量热（DSC）、宽频介电谱（BDS）以及热刺激电流（TSC）分别测试了试样的玻璃化转变温度（Tg）、介电松弛和陷阱分布。结果表明：升温速率为20℃/min时，环氧试样的玻璃化转变温度为118.08℃；环氧试样在不同的温度区间存在3个松弛过程，分别对应着环氧材料本征β松驰、α松弛及载流子在高温下的脱陷过程；TSC高温区域陷阱的活化能为1.5 eV，与介电谱图中150℃出现的损耗峰活化能1.28 eV接近，为载流子入陷与脱陷所致。介电温谱的试验结果反映了介电常数和介质损耗随温度的变化关系，与宽频介电谱试验和TSC试验结果相对应。通过研究环氧浇注件松弛极化过程及陷阱分布，为提高传统环氧树脂复合材料的电气性能提供技术支持。
To study the dielectric relaxation characteristic of epoxy casting materials for gas insulated switchgear (GIS) under different temperatures, the glass transition temperature, dielectric relaxation, and trap distribution of the samples were tested by differential scanning calorimetry (DSC), broadband dielec-tric spectroscopy (BDS) and thermally stimulated current (TSC). The results show that when the heating rate is 20℃/min, the glass transition temperature of epoxy sample is 118.08℃. The epoxy sample has three kinds of relaxation process in different temperature range, which correspond to β relaxation and αrelaxation of epoxy resin and detrap process of carriers at high temperature, respectively. The activation energy of trap at high temperature region obtained from TSC curve is 1.5 eV, which is similar to the acti-vation energy of loss peak (1.28 eV) in BDS at 150℃, and they are probably originated from the trap and detrap process of carriers. The temperature dependance of dielectric constant and dielectric loss corre-sponds to the results of BDS and TSC. The results of polarization process and trap distribution of epoxy casting materials provide technical support to enhance electrical properties of epoxy resin composite.
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