高电压技术2024，Vol.50Issue(5)：2217-2224,8.DOI:10.13336/j.1003-6520.hve.20230817
油纸绝缘层间气泡局部放电演化特性
Evolution Characteristics of Bubble Partial Discharge Between Oil Paper Insulation Layers
摘要
Abstract
Under multiple stresses of electricity and heat inside transformer,air bubbles are likely to be generated between turns of the oil-paper insulation to induce partial discharge(PD),which threatens the safe operation of transformer.In this paper,the evolution characteristics of bubble PD between oil and paper insulation layers are studied by the pulse current method,and the relationship between PD evolution process and bubble defect degradation is grasped.The results show that,according to the variation of average apparent charge(Q),discharge repetition rate(N)and partial discharge phase spectrum(PRPD)of PD with time,the bubble PD evolution can be divided into three stages,namely,initial stage,transi-tion stage,and stable stage.The PD evolution mechanism was studied by changing the duration of voltage application and bubble position and analyzing the change of gas content inside the bubble after PD lasted for different time.It is found that the reason for the pattern features at initial stage is the accumulation of space charge on the insulating paper surface,and the evolution of the transitional stage is due to the exhaustion of electronegative gas represented by oxygen under the continuous effect of PD,which changes the discharge mode in the bubble change.In addition,the interlayer position,the height and area of the bubbles have significant impacts on the apparent charge and repetition rate.Quantitative results show that the intensity of PD is positively correlated with the bubble defect parameters,and the degree of defect deterio-ration can be evaluated by PD.This study reveals the evolution law and influencing factors of interlayer bubble PD,which can provide a reference for the evaluation of transformer oil-paper insulation state.关键词
油纸绝缘/层间气泡/局部放电/演化特性/气泡参数Key words
oil paper insulation/interlayer bubbles/partial discharge/evolution characteristics/bubble parameters引用本文复制引用
周俊杰,吴治诚,张乔根,张锐,倪鹤立,贺林..油纸绝缘层间气泡局部放电演化特性[J].高电压技术,2024,50(5):2217-2224,8.基金项目
国网上海市电力公司科技项目(520940230015).Project supported by Science and Technology Project of State Grid Shanghai Electric Power Company(520940230015). （520940230015）
