电网技术Issue(11)：3232-3237,6.DOI:10.13335/j.1000-3673.pst.2014.11.043
硅橡胶复合绝缘子老化状态评估新判据
A New Criterion to Assess Aging Status of Silicon Rubber Composite Insulator
摘要
Abstract
To assess the aging state of composite insulator by conduction current characteristic of silicon rubber material, the composite insulators being operated in the field are taken as samples. Through the testing of conduction current the electrical degradation thresholds for the samples experienced different operated durations are achieved; according to the electrical degradation thresholds the aging states of the samples are assessed;the hydrophobicity of samples is analyzed by the measured results of static contact angles is analyzed; finally, the surface micro textures of samples are tested and analyzed by scanning electron microscope. Preliminary tests found that the more serious aging degree of samples, the deeper their trap levels are, and the lower the electrical degradation threshold, the larger the conduction current values are; the electrical degradation threshold of the sample with shorter operation duration is about 10kV/mm, and the electrical degradation threshold of the sample with operated duration of 15 years is about 5.5kV/mm; the conduction current of seriously aged samples is several times higher than that of the sample with shorter operation duration; the carrier density of the trap is in direct proportion to the electrical degradation threshold; the electrical degradation threshold of the sample highly corresponds to its hydrophobicity and surface micro texture. Research results show that the electrical degradation threshold obtained by conduction current test of silicon rubber material can basically reflect the aging state of insulation material, thus the electrical degradation threshold could be a new criterion to assess the aging state of silicon rubber composite insulators.关键词
硅橡胶/复合绝缘子/电导电流/电老化阈值/陷阱/老化评估Key words
silicone rubber/composite insulator/conduct-ion current/electrical degradation threshold/trap/aging diagnosis分类
信息技术与安全科学引用本文复制引用
汪佛池,黄成才,李永刚,杨升杰,张志猛..硅橡胶复合绝缘子老化状态评估新判据[J].电网技术,2014,(11):3232-3237,6.基金项目
国家自然科学基金项目(51207055)；中央高校基本科研业务费专项资金项目(13MS71)。Project Supported by National Natural Science Foundation of China(51207055) （51207055）
Project Supported by the Fundamental Research Funds for the Central Universities (13MS71) （13MS71）
