为对10 kV运行电缆的绝缘状态进行简单、快速诊断，基于极化-去极化电流(PDC)特征研究了针对电缆水树老化的绝缘诊断判据。采用高频高压水针电极法对电缆实验样品进行加速水树老化，使用显微镜定期观察不同老化时期样品中的水树形态，并统计水树长度，同时使用PDC测试平台对水树老化样品进行测试。利用测得的极化和去极化电流曲线求得电缆绝缘层的直流电导率和非线性系数，分析两参数随样品老化程度的变化趋势及规律。结果表明：根据直流电导率和非线性系数的变化能有效判别电缆绝缘中的水树老化问题。
In order to diagnose the insulation condition of 10 kV power cables simply and rapidly, the diagnosis criterion based on polarization-depolarization current (PDC) characteristics for water-treed cables was investigated. The cable samples were performed accelerated water tree ageing experiment through water needle electrode method, and the morphology of water trees in the samples was observed by micro-scope, and then the length of water trees were counted. At the same time, the water-treed samples were tested by the PDC detection system. The DC conductivity and the non-linearity factor of cable insulation were acquired by the measured polarization and depolarization current curves, and the change tendency of the two parameters with the ageing condition of cables was analyzed. The results show that the water tree ageing problems in cable insulation can be assessed effectively via the change of DC conductivity and non-linearity factor.
参考文献
| [1] | 陈涛;魏娜娜;陈守娥;王连成;王雨.交联聚乙烯电力电缆水树产生机理、检测及预防[J].电线电缆,2009(4):1-3,7. |
| [2] | Robert Ross.Inception and propagation mechanisms of water treeing[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,19985(5):660-680. |
| [3] | Boggs S.;Densley J.;Kuang J..Mechanism for impulse conversion of water trees to electrical treesin XLPE[J].IEEE Transactions on Power Delivery,19982(2):310-315. |
| [4] | 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. |
| [5] | 李华春;周作春;徐阳;曹晓珑;杨文虎.交联电缆绝缘在线检测方法综述[J].绝缘材料,2008(6):59-62. |
| [6] | 吴明祥;欧阳本红;李文杰.交联电缆常见故障及原因分析[J].中国电力,2013(5):66-70. |
| [7] | 蒲路;郑建康;景晓东;薛军;欧阳本红.交联电力电缆运行维护新技术评估[J].陕西电力,2009(7):57-61. |
| [8] | 李军浩;司文荣;姚秀;董明;李彦明.油纸绝缘变压器老化状态评估的极化/去极化电流技术研究[J].仪器仪表学报,2009(12):2605-2611. |
| [9] | M. Abou Dakka;A. Bulinski;S. Bamji.Correlation between dc Polarization and Failure Characteristics of XLPE and EPR Aged with ac Voltage in a Wet Environment[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,20054(4):700-708. |
| [10] | 赵威;周凯;刘凡;杨琳;刘曦.在XLPE电缆加速老化过程中理解水树的自愈性[J].电工技术学报,2014(6):311-317,332. |
| [11] | Zhou, K.;Zhao, W.;Tao, X..Toward understanding the relationship between insulation recovery and micro structure in water tree degraded XLPE cables[J].IEEE transactions on dielectrics and electrical insulation: A publication of the IEEE Dielectrics and Electrical Insulation Society,20136(6):2135-2142. |
- 下载量()
- 访问量()
- 您的评分：
-
10%
-
20%
-
30%
-
40%
-
50%