局部放电对油浸绝缘纸表面损伤特性研究  

Characteristics of Partial Discharge-caused Surface Damage for Oil-impregnated Insulation Paper

作　　者：廖瑞金[1] 严家明[1] 杨丽君[1] 朱孟兆[1] 孙才新[1] 

机构地区：[1]输配电装备及系统安全与新技术国家重点实验室(重庆大学),重庆市沙坪坝区400044

出　　处：《中国电机工程学报》2011年第10期129-137,共9页Proceedings of the CSEE

基　　金：国家重点基础研究发展计划项目(973项目)(2009CB724505-1)~~

摘　　要：为了提高绝缘材料的耐局部放电能力,对局部放电损伤过程中油浸绝缘纸的表面形貌、表面粗糙度、表面电导率、表面生成物和气隙气体进行了研究。根据局部放电相位分布(phase-resolved partial discharge,PRPD)模式的变化将放电损伤过程划分为5个阶段,分别利用光学显微镜、扫面电镜、原子力显微镜和高阻仪对每一损伤阶段的绝缘表面情况进行分析,并用气质联动仪分析了其气隙气体组分。研究结果表明:在5个损伤阶段中,绝缘表面相继出现"烧蚀"、"剥皮"、"裂化分丝"、"凹坑"和"树枝化"现象,且有"液滴"和晶状"固体"相继生成,电负性气体含量交替下降上升;绝缘表面三维粗糙度先下降后上升;绝缘表面电导率总体呈现增长趋势并最终趋于稳定,但在不同损伤阶段其增长速率不同。提供了判断油浸绝缘纸表面状况及缺陷发展状况的参考信息。To improve partial discharge （PD） resistance of insulation materials, researches on surface topography, surface roughness, surface products and surface conductivity of oil-impregnated insulation papers were conducted during the process of damage caused by PD within the cavity of the paper; and the gas constitution within the cavity was studied. According to phase-resolved partial discharge （PRPD） patterns, the damage process can be divided into five stages. For each stage, surface conditions of insulation were analyzed with optical microscopy, scanning electron microscopy （SEM）, atomic force microscopy （AFM） and high-resistance meters. Meanwhile, gas constitution was analyzed with gas chromatography-mass spectrometry （GC-MS）. The study demonstrated that insulation surfaces successively experience ＂ablating,＂ ＂peeling,＂ ＂cracking in silk,＂ ＂pitting,＂ and ＂electrical treeing＂ during the five stages of the damage process, along with the sequential generation of droplets and crystalline solids; percentage content of electronegative gases descends and ascends alternately; three-dimensional surface roughness initially decreases then increases; surface conductivity presents a general increasing trend before eventually stabilizes, while its growth rate varies in different damage stages. Results of the study can provide reference for the assessment of surface conditions and flaw degree of oil-impregnated insulation papers.

关 键 词：局部放电 油浸绝缘纸 表面损伤 电负性 粗糙度 电导率 

分 类 号：TM835[电气工程—高电压与绝缘技术]