摘要
换流变压器在正常运行过程中,水分会导致油纸绝缘电气性能下降并加速其老化,导致寿命下降和绝缘击穿。为研究水分对油纸绝缘交直流复合电压下空间电荷特性与击穿特性的影响,制备不同含水量的油纸绝缘试样,利用交直流复合电压下空间电荷测量系统,得到了交流、直流及交直流复合电压形式下水分含量对油纸绝缘空间电荷特性的影响规律,同时研究了不同水分含量试样在不同电压类型下的击穿特性。结果表明:交直流复合电压下油纸绝缘中的电场畸变率大于直流和交流电压下的电场畸变率;随着直流分量的增加,较高含水量试样的电气强度增加幅度明显低于较低含水量试样,低含水量试样的电气强度受直流电压分量影响而高于高含水量试样。
During the normal operation of converter transformer, moisture will cause the decline of the electrical performance of oil-paper insulation and accelerate its ageing, resulting in a decrease of life and insulation breakdown. In order to study the influence of moisture on the space charge characteristics and breakdown characteristics of oil-paper insulation under AC and DC composite voltage, we prepared oil-paper insulation samples with different water content, then we used space charge measurement under AC and DC composite voltage to get the influence of moisture content on the space charge characteristics of oil-paper insulation under the voltage forms of AC, DC, and AC and DC composite voltage, and studied the breakdown characteristics of samples with different moisture contents under different voltage types. The results show that the electric field distortion rate of oil-paper insulation under AC and DC composite voltage is greater than that under DC and under AC electric field;as the DC component increases, the increase amplitude of breakdown voltage of the samples with higher water content is significantly lower than that of samples with lower water content, and the electric strength of samples with low water content is more affected by the DC voltage component than that of samples with high water content.
作者
周远翔
薛磊
黄欣
张云霄
滕陈源
ZHOU Yuanxiang;XUE Lei;HUANG Xin;ZHANG Yunxiao;TENG Chenyuan(The Wind Solar Storage Division of State Key Laboratory of Control and Simulation of Power System and Generation Equipment,School of Electrical Engineering,Xinjiang University,Urumqi 830047,China;State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment,Department of Electrical Engineering,Tsinghua University,Beijing 100084,China)
出处
《绝缘材料》
CAS
北大核心
2022年第2期57-66,共10页
Insulating Materials
基金
国家重点研发计划项目(2017YFB0902704)
新疆维吾尔自治区区域协同创新专项(科技援疆计划)(2019E0236)。
关键词
含水量
交直流复合
油纸绝缘
空间电荷
water content
AC and DC composite
oil-paper insulation
space charge
