对油纸绝缘样品施加10 k V/mm场强进行电老化试验,并采用松弛电流法研究了油纸绝缘的老化评估方法。利用色谱法测试不同老化程度油样中的溶解气体,发现老化前后气体含量变化显著,说明经电老化的试样老化明显。分别选取6个老化时间点的...对油纸绝缘样品施加10 k V/mm场强进行电老化试验,并采用松弛电流法研究了油纸绝缘的老化评估方法。利用色谱法测试不同老化程度油样中的溶解气体,发现老化前后气体含量变化显著,说明经电老化的试样老化明显。分别选取6个老化时间点的样品进行松弛电流测试,从不同角度分析不同参量所表征的老化信息。利用I*t^log10t曲线分析了油纸试样的陷阱分布,发现试样老化初期陷阱密度逐渐增加,试样老化后期陷阱深度明显加深。运用四阶Debye模型对电流曲线进行拟合,推断了油纸绝缘四种松弛机制的物理机理,发现各松弛机制随着老化时间的增加有不同程度的增大。最后研究了去极化电量随老化时间的变化趋势,试图用直观参数分析试样在不同时间点的老化程度,发现在60 h后开始大幅度加深。展开更多
The shortcomings of oil-immersed transformer solid insulation like low high-temperature resistance of the insulation paper and the uneven distribution of electric field caused by the large difference of dielectric con...The shortcomings of oil-immersed transformer solid insulation like low high-temperature resistance of the insulation paper and the uneven distribution of electric field caused by the large difference of dielectric constants between insulation paper and transformer oil,restricted the development of transformer with smaller size and larger capacity.In view of this situation and the transformer’s demand for the dielectric physicochemical and mechanical property of insulation material,polycarbonate,polyester film and polyphenylene sulfide with high high-temperature resistance were chosen for the comparison analysis in this paper We did the 300-day thermal aging experiment on four samples in transformer oil under different aging temperatures of90°C,110°C and 130°C,then analyzed the changes of their dielectric properties.The experiment results are as follows;the permittivity and dielectric dissipation factor of the three polymer materials are apparently smaller than those of the paper both before and after 300-day aging;the volume resistivity and partial discharge inception voltage of the three materials are higher than those of the paper both before and after aging;and the breakdown field strength of polycarbonate is higher than that of the paper both before and after aging,while that of polyester film and polyphenylene sulfide are slightly lower than that of the paper.展开更多
文摘对油纸绝缘样品施加10 k V/mm场强进行电老化试验,并采用松弛电流法研究了油纸绝缘的老化评估方法。利用色谱法测试不同老化程度油样中的溶解气体,发现老化前后气体含量变化显著,说明经电老化的试样老化明显。分别选取6个老化时间点的样品进行松弛电流测试,从不同角度分析不同参量所表征的老化信息。利用I*t^log10t曲线分析了油纸试样的陷阱分布,发现试样老化初期陷阱密度逐渐增加,试样老化后期陷阱深度明显加深。运用四阶Debye模型对电流曲线进行拟合,推断了油纸绝缘四种松弛机制的物理机理,发现各松弛机制随着老化时间的增加有不同程度的增大。最后研究了去极化电量随老化时间的变化趋势,试图用直观参数分析试样在不同时间点的老化程度,发现在60 h后开始大幅度加深。
基金supported by the National Natural Science Foundation of China(Grant No.50977025)
文摘The shortcomings of oil-immersed transformer solid insulation like low high-temperature resistance of the insulation paper and the uneven distribution of electric field caused by the large difference of dielectric constants between insulation paper and transformer oil,restricted the development of transformer with smaller size and larger capacity.In view of this situation and the transformer’s demand for the dielectric physicochemical and mechanical property of insulation material,polycarbonate,polyester film and polyphenylene sulfide with high high-temperature resistance were chosen for the comparison analysis in this paper We did the 300-day thermal aging experiment on four samples in transformer oil under different aging temperatures of90°C,110°C and 130°C,then analyzed the changes of their dielectric properties.The experiment results are as follows;the permittivity and dielectric dissipation factor of the three polymer materials are apparently smaller than those of the paper both before and after 300-day aging;the volume resistivity and partial discharge inception voltage of the three materials are higher than those of the paper both before and after aging;and the breakdown field strength of polycarbonate is higher than that of the paper both before and after aging,while that of polyester film and polyphenylene sulfide are slightly lower than that of the paper.
