摘要
为了研究不同类型电热复合应力对油纸绝缘老化特性的影响,本文搭建了油纸绝缘电(均匀电场、电晕放电)热(140℃)联合老化系统,对油纸绝缘进行168h的电热复合应力老化,并定期取样测量油纸绝缘老化产物含量,对比分析了不同电热复合应力与热应力下老化产物的生成规律。结果表明,油中糠醛含量、酸值,绝缘纸聚合度(DP)在电场的持续作用下相比单因子热老化以及间断的电晕放电变化更为明显,并且变压器油在电场与温度的作用下析出黑色物质。在老化168h下,绝缘纸击穿电压在温度与电场的作用下变化不明显,而间断的电晕放电使绝缘纸击穿电压变小。
In order to study the influence of electro-thermal stress on the aging characteristics of oil-paper insulation,the electricity(uniform electric field,corona discharge)and thermal(140℃)aging system was built in this paper.The oil paper insulation was subjected to electro-thermal stress about168h,the contents of aging products were measured periodically,and the generation principle of aging products was compared and analyzed.The results show that the changes of furfural content and acid value in oil,the DP of insulating paper are more obvious under the influence of electric field compared with single factor thermal aging and intermittent corona discharge,moreover,the transformer oil precipitates black substance under the influence of electric field and temperature.Under the aging168h,the changes of breakdown voltage of the insulating paper is not obvious under the influence of the temperature and the electric field,while the interrupted corona discharge makes the breakdown voltage of the insulating paper become smaller.
作者
穆龙
兰生
黄明亮
Mu Long;Lan Sheng;Huang Mingliang(Fuzhou Tianyu Electric Co., Ltd, Fuzhou 350000;School of Electrical Engineering and Automation, Fuzhou University, Fuzhou 350108)
出处
《电气技术》
2018年第12期29-34,共6页
Electrical Engineering
基金
福建省自然科学基金(2015J01194)
福州大学校企合作创新基金(TYDQ1802)
关键词
电力变压器
电热老化
热老化
特征参量
power transformer
electro-thermal aging
thermal aging
characteristic parameter
