步进电压下变压器匝间油纸绝缘的电老化  

Electrical Ageing of Interturn Oil-paper Insulation for Transformer Under Step-voltage

作　　者：林春耀 欧小波 魏新劳[2] 聂洪岩[2] 林林[2] 池明赫[2] 

机构地区：[1]广东电网有限责任公司电力科学研究院,广州510600 [2]哈尔滨理工大学科技发展总公司,哈尔滨150040

出　　处：《绝缘材料》2016年第8期53-59,67,共8页Insulating Materials

基　　金：国家自然科学基金面上项目(51277047);国家自然科学基金青年基金项目(51407051)

摘　　要：为评估油浸式变压器匝间油纸绝缘的电老化寿命,采用步进电压法对所设计的模型线圈进行加速电老化试验。基于极大似然法对试验数据进行统计分析,求出了反幂模型中的常数A及电压寿命指数N,并与恒定电压下的试验数据进行对比。结果计算寿命与试验数据相吻合,证明了用步进电压法对变压器匝间油纸绝缘进行电老化试验的可行性。求出了老化寿命与电场强度间的反幂模型,计算出模型线圈设计寿命为30年时所允许的最大工作电场强度值,并解释了该场强值远大于实际变压器设计时许用场强值的原因。In order to assess the electric ageing life of interturn oil-paper insulation for oil-immersed transformer, a designed model coil was conducted accelerated electrical ageing under step-voltage. The test data were analyzed statistically by maximum likelihood algorithm, and the constant A and voltage endurance coefficient N in the inverse power model were obtained, and then were compared with the test data under constant voltage. The results show that the calculated life is consistent with the experimental data, which prove the feasibility of electrical ageing test for intermrn oil-paper insulation of oil-immersed trans- former. The inverse power model between ageing life and electric field intensity was obtained, and the maximum electric field intensity value was calculated when the design life of model coil was 30 years, meanwhile the reason why the maximum electric field intensity value was greater than the designed allow-able field intensity of actual transformer was explained.

关 键 词：步进电压 变压器 匝间油纸绝缘 电老化 

分 类 号：TM855[电气工程—高电压与绝缘技术]