为研究XLPE电缆绝缘中水树的生长规律，对不同老化时间下XLPE材料的水树生长特性进行了对比分析。采用水针电极法加速电缆绝缘水树老化，利用光学显微镜和扫描电镜观察不同老化时间下电缆水树的微观结构特征，并对水树尺寸进行测量统计。结果表明：不同老化时间下的水树形态和尺寸均存在明显差异，随着老化时间的增加，水树枝变得密集，染色区域颜色变深。在电机械应力作用下XLPE分子链疲劳累积断裂，水分以密集充水细枝的方式向四周辐射扩散，逐渐形成水树通道和微孔，随着通道和微孔数量的增加，水树逐渐变长。
In order to study the propagation law of water tree in XLPE power cables, the propagation characteristics of water trees in XLPE materials under different ageing time were compared and analyzed. Cables were accelerated aged by water-needle electrode method, and the microstructure of water trees in the cables was observed via optical microscope and scanning electron microscope, then the sizes of water trees were measured. The results show that the morphologies and sizes of water trees aged for different time are obvious different. With the increase of ageing time, the water tree is denser, and the color of dyeing area is darker. The XLPE molecular chains break with fatigue under Maxwell stress, so plenty of water-filled branches spread to the surrounding insulation along the field direction, then the water tree channels and voids are formed. With the increase of channels and voids, the water trees grow.
参考文献
| [1] | Ross R.;Smit J.J..Composition and growth of water trees in XLPE[J].IEEE transactions on electrical insulation. (Institute of Electrical and Electronics Engineers. Electrical Insulation Group). New York.,19923(3):519-531. |
| [2] | 周凯;陶霰韬;赵威;李旭涛;刘凡.在水树通道内生成纳米TiO2的电缆修复方法及其绝缘增强机制研究[J].中国电机工程学报,2013(7):202-210,前插26. |
| [3] | 杨滴;周凯;陶文彪;黄明;杨明亮.预修复对交联聚乙烯电缆中水树生长的抑制作用[J].高电压技术,2015(8):2732-2740. |
| [4] | S. Hvidsten;E. Ildstad;J. Sletbak;H. Faremo.Understanding water treeing mechanisms in the development of diagnostic test methods[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,19985(5):754-760. |
| [5] | Li, J.;Zhao, X.;Yin, G.;Li, S.;Zhao, J.;Ouyang, B..The effect of accelerated water tree ageing on the properties of XLPE cable insulation[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,20115(5):1562-1569. |
| [6] | 郑晓泉;王金锋;李彦雄.交联聚乙烯中水树枝向电树枝的转化[J].中国电机工程学报,2013(22):166-174. |
| [7] | 李剑;俸波;章华中;杨丽君;黄正勇.低密度聚乙烯/纳米蒙脱土复合材料的水树枝生长特性[J].高电压技术,2012(9):2410-2416. |
| [8] | 豆朋;文习山.交联聚乙烯电缆中水树研究的现状[J].绝缘材料,2005(2):61-64. |
| [9] | Hernandez-Mejia, J.C.;Harley, R.;Hampton, N.;Hartlein, R..Characterization of Ageing for MV Power Cables Using Low Frequency Tan δ Diagnostic Measurements[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,20093(3):862-870. |
| [10] | Steennis E.F.;Kreuger F.H..Water treeing in polyethylene cables[J].IEEE transactions on electrical insulation. (Institute of Electrical and Electronics Engineers. Electrical Insulation Group). New York.,19905(5):989-1028. |
| [11] | 豆朋;文习山;龚瑛.几种因素对水树生长影响的研究[J].绝缘材料,2005(1):33-36. |
| [12] | 欧阳本红;康毅;赵健康;赵学童;李建英;李盛涛.加速水树老化对XLPE电力电缆绝缘性能的影响[J].高电压技术,2010(8):1942-1949. |
| [13] | 周凯;陶文彪;赵威;杨滴;杨明亮.以分子取向理论理解交联聚乙烯中水树在不同温度下的生长特性[J].高电压技术,2014(12):3665-3673. |
| [14] | 纳米TiO2掺杂对低密度聚乙烯空间电荷行为的影响[J].材料研究学报,2005(05):519-524. |
| [15] | 陈向荣;徐阳;徐杰;史文;杨文虎;刘英;曹晓珑.工频电压下110 kV XLPE电缆电树枝生长及局放特性[J].高电压技术,2010(10):2436-2443. |
| [16] | Jean-Pierre Crine;Jinder Jow.A water treeing model[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,20054(4):801-808. |
| [17] | M. H. Abderrazzaq.Development of Water Tree Structure in Polyester Resin[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,20051(1):158-165. |
| [18] | Wang, Z.;Marcolongo, P.;Lemberg, J.A.;Panganiban, B.;Evans, J.W.;Ritchie, R.O.;Wright, P.K..Mechanical fatigue as a mechanism of water tree propagation in TR-XLPE[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,20121(1):321-330. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%