摘要
电力变压器在发、输、变、配电系统中起着至关重要的作用,它的性能、质量直接关系到电力系统运行的可靠性和运营效益。寻找新型聚合物材料代替绝缘纸用于变压器固体绝缘改善电场分布和绝缘结构,将非常有利于变压器朝着大容量、紧凑型方向发展,有非常好的应用前景。本文选择聚碳酸酯、聚酯薄膜两种聚合物材料作为研究对象,并与绝缘纸对比,选择90℃、110℃和130℃三种不同的老化温度进行电热老化试验,对材料不同老化阶段的聚合度,介质损耗因数进行了测试,并结合物理外观性变和扫描电镜测试结果进行了对比分析,为判断这两种材料能否成为油浸式变压器绝缘材料提供了依据。
Power transformer plays a crucial role in the generation, transmission, transformation and distribution system. The reliability and operational efficiency of power system is directly related to its performance and quality. So it is very significant to explore new polymer materials instead of insulating paper to improve electric field distribution and insulation structure. This will be very beneficial to make transformer large-capacity and compact, and there is a very good application prospects. In this paper, two kinds of high-temperature resistance polymer materials-polycarbonate(PC) and polyester(PET) are chosen as the candidates for comparison with paper. They are put in the transformer oil with electrical-thermal aging for 300 days under 90℃, 110℃ and 130℃ respectively. The tests for the degree of polymerization(DP) and dielectric loss factor are studied, combined with the physical properties and electron microscope scanning(SEM) to decide whether they can be used in oil-immersed transformer.
出处
《电工技术学报》
EI
CSCD
北大核心
2014年第4期282-289,共8页
Transactions of China Electrotechnical Society
基金
国家自然科学基金资助项目(50977025)
