摘要
对干式绝缘设备用环氧树脂试样进行老化实验,对不同老化程度的试样进行电气强度和介电谱实验,计算其活化能。发现随着老化程度的加深,环氧树脂的活化能呈现降低-升高-略有降低-升高的变化趋势,电气强度呈现曲折下降的趋势。通过阿伦尼乌斯方程得到的热老化加速因子(AF)可将高温加速老化时间转化为工作温度运行时间。以试样电气强度下降至起始值的50%作为材料寿命终结的标志,得到环氧树脂材料寿命终结对应的活化能为209.7 kJ/mol。建立了基于活化能判断环氧树脂类干式绝缘状态和预测寿命的方法,并以干式变压器为例提出了干式绝缘设备的介电谱测量接线方式和测试方法。对工程实际的干式变压器运用寿命预测方法,得到干式变压器的活化能为69.4 kJ/mol,预测其最少剩余寿命为36.5年。
The epoxy resin samples for dry type insulation equipment were conducted ageing test. The electric strength and dielectric spectrum of the samples with different ageing degree were tested, and their activation energy were calculated. It is found that with the increase of ageing degree, the activation energy of the epoxy resin shows a change trend of decreasing-increasing-slightly decreasing-increasing, and the electric strength shows a zigzag downward trend. The accelerated ageing time at high temperature can be converted into operating time at working temperature by the accelerated ageing factor(AF) obtained by Arrhenius equation. Taking that the electric strength decreases to 50% of the initial value as a sign of life end for material, we could obtain the activation energy corresponding to the life end of epoxy resin material, which is 209.7 kJ/mol. The judging method of the insulation state and life for epoxy resin dry type insulation based on activation energy is established, and the connection mode and test method of dielectric spectrum measurement for dry type insulation equipment are proposed by taking dry type transformer as an example. The life prediction method is applied to an actual dry type transformer in the project, it is obtained that the activation energy of the dry-type transformer is 69.4 kJ/mol, and the its minimum residual life is predicted to be 36.5 years.
作者
任鹏
刘红磊
李云鹏
张蔚
李庆民
REN Peng;LIU Honglei;LI Yunpeng;ZHANG Wei;LI Qingmin(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources,North China Electric Power University,Beijing 102206,China;State grid Shanghai songjiang electric power supply company,Shanghai 201699,China)
出处
《绝缘材料》
CAS
北大核心
2021年第3期91-97,共7页
Insulating Materials
基金
国家自然科学基金资助项目(51929701、51737005、52081330507)
中央高校基本科研业务费资助项目(2019QN114)
国家电网公司科技项目(KJ19-1-29)。
关键词
活化能
干式绝缘
寿命预测
电气强度
老化加速因子
activation energy
dry insulation
life prediction
electric strength
ageing accelerating factor
