不同交流电压下交联聚乙烯电缆绝缘电气树生长结构分析

R. Sahoo, S. Karmakar
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引用次数: 0

摘要

局部放电(PD)活动的存在会降低高压交联聚乙烯电缆的绝缘强度,降低其使用寿命。绝缘性能会受到热老化、电老化、机械老化和环境条件等各种因素的影响。造成劣化的主要原因是由于空隙、裂纹、杂质污染等造成的放电。如果这些放电持续一段时间,它就会复制几个被称为电树的羰基通道。树形现象的增长速度意味着正在使用的电缆突然完全损坏。本工作主要集中在一个33 kV, 3芯XLPE电缆绝缘样品的PD测量,分形维数分析和电气树生长特性随时间的分析。针对针电极配置用于研究各种类型的树形结构形成与他们的PD活动。采用盒计数法对分形维数进行分析,分形维数提供了损伤体积的信息。利用ImageJ.net对XLPE样品在树木生长期间的结构变形进行了地形图分析。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Electrical Tree Growth Structural Analysis of XLPE Cable Insulation under Different AC Voltage
The presence of partial discharge (PD) activities degrades the insulation strength and reduces the life span of in-service high voltage XLPE cable. The insulation properties are deteriorated by various factors, such as thermal-aging, electrical-aging, mechanical-aging, and environmental conditions. The main causes of the deterioration are the discharges, due to void, crack, contamination of impurities, etc. If these discharges continue for a certain period, it replicates several carbonyl channels which are known as an electrical tree. The growth rate of treeing phenomena implies a sudden and complete breakdown of in-service cable. This work primarily focuses on the PD measurement, fractal dimension analysis, and electrical tree growth characteristics analysis with respect to time in a 33 kV, 3 core XLPE cable insulation sample. Needle-to-needle electrode configuration is used to investigate the various type of tree structure formation with respect to their PD activities. The Box-counting method is implemented to analyze the fractal dimension which provided information on the volume of damage. The structural deformation of XLPE sample during the tree growth period is examined using ImageJ.net by surface plot analysis.
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