改性聚酰亚胺沿面放电特性研究

发布时间：2018-06-22 12:41

本文选题：聚酰亚胺 + 沿面放电　；参考：《绝缘材料》2016年11期

【摘要】：聚酰亚胺材料以其优越的介电性能广泛应用于电力系统的绝缘中,其表面发生沿面放电是影响其绝缘性能的关键因素之一。利用自行搭建的试验系统,以纯聚酰亚胺、玻璃纤维和钛酸钾改性的聚酰亚胺为研究对象,借助扫描电子显微镜,分析其表面碳化情况,并测量其在标准大气压、低气压和高真空三种状态下的电气强度。结果表明:含有钛酸钾的聚酰亚胺材料和直角倒角的纯聚酰亚胺材料碳化现象不太明显。扫描电镜显示,低气压下绝缘材料表面比标准大气压下的平滑,含有玻璃纤维和钛酸钾的聚酰亚胺材料表面均出现孔洞。标准大气压下,含有钛酸钾的聚酰亚胺材料电气强度最低,含有玻璃纤维的聚酰亚胺电气强度最高;低气压下,含有玻璃纤维的聚酰亚胺材料电气强度最低,厚度较小时,含有钛酸钾的聚酰亚胺材料电气强度略低于纯聚酰亚胺;高真空下,纯聚酰亚胺的绝缘性能最好。
[Abstract]:Polyimide materials are widely used in the insulation of power systems due to their excellent dielectric properties. Surface discharge is one of the key factors affecting the insulation performance of polyimide materials. The surface carbonation of pure polyimide, glass fiber and potassium titanate modified polyimide was analyzed by means of scanning electron microscope (SEM), and its surface carbonation was measured at the standard atmospheric pressure by using the self-built test system, using the pure polyimide, glass fiber and potassium titanate modified polyimide as the research object. Electrical strength at low pressure and high vacuum. The results show that the carbonation of polyimide material containing potassium titanate and pure polyimide material with right angle chamfer is not obvious. Scanning electron microscope (SEM) showed that the surface of insulating material at low pressure was smoother than that under standard atmospheric pressure, and pores were found in the surface of polyimide material containing glass fiber and potassium titanate. At the standard atmospheric pressure, the polyimide material containing potassium titanate has the lowest electrical strength, and the polyimide containing glass fiber has the highest electrical strength; at low pressure, the polyimide material containing glass fiber has the lowest electrical strength, and the thickness is small. The electrical strength of polyimide containing potassium titanate is slightly lower than that of pure polyimide, and the insulation property of pure polyimide is the best under high vacuum.
【作者单位】：华北电力大学电气与电子工程学院;北京控制工程研究所;
【基金】：国家自然科学基金资助项目(51277066)
【分类号】：TM21

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