基于泄漏电流相位差的绝缘子污秽度表征方法研究  

Study of the Characterization Method of Insulator Contamination Degree Based on the Phase Difference of LC

作　　者：方春华[1] 周毅[1] 贾伯岩[2] 王建国[3] 樊亚东[3] 汤世祥 

机构地区：[1]三峡大学电气与新能源学院,湖北宜昌443002 [2]国网河北省电力公司电力科学研究院,河北石家庄050021 [3]武汉大学电气工程学院,武汉430072

出　　处：《高压电器》2016年第2期7-12,共6页High Voltage Apparatus

基　　金：国网河北省电力公司电力科学研究院科技项目(KJ2014-042);三峡大学2015年硕士学位论文培优基金(2015PY041)~~

摘　　要：针对电力系统运行中悬式绝缘子污秽度实时监测困难,预测方法准确性不高。文中在多因子环境试验箱内对XP-70绝缘子进行大量人工污秽试验,在非饱和湿度范围内控制湿度缓慢变化,得到绝缘子泄漏电流与施加电压间的相位差(θ)变化规律及其与环境湿度(R_H)、盐密(ESDD)和灰密(NSDD)间的定量关系。指出θ与RH呈现显著的负相关性,特别是RH>65%后,θ随R_H变化更为明显同时对污秽度变化较为敏感,可作为反映绝缘子润湿程度和表面污秽度的表征。提出相位差与湿度变化范围的比值(k)可作为表征污秽度等级的参量,测量R_H、θ后可通过k值与污秽度的关系式计算出绝缘子表面的污秽等级,此方法可作为现场污秽度实时监测的有效手段。In order to overcome the difficulties of real-time monitoring and the low accuracy of prediction technique to the pollution degree of suspension insulator in the power system operation, in this paper, large amount of artificial pollution experiments to the XP-70 insulator are done in multi-factor environmental test chamber. By changing the humidity slowly in the range of unsaturated humidity, the change law of phase difference（θ）of applied voltage and LC and the quantitative relationship between θ and ambient humidity（RH）, ESDD, NSDD are obtained.The results are as follows： θ and RHpresent a significant negative correlation, in particular, the correlation is more obvious when RH〉65%, meanwhile, θ is more sensitive to pollution degree change, hence θ could be a characterization to reflect the degree of wetting and surface contamination. The ratio（k）of θ and humidity range can be used as the parameter to characterize the degree of pollution. And the contamination level of insulator surface would be calculated using the relational expression after RH, θ measured. This method can be used as an effective way for real-time monitoring of pollution degree.

关 键 词：绝缘子 泄漏电流 相对湿度 相位差 等值附盐密度 

分 类 号：TM216[一般工业技术—材料科学与工程]