机械振动疲劳条件下装配缺陷盘形悬式瓷绝缘子串元件劣化试验研究  

Experimental Investigation on Degradation of the High-Voltage Porcelain Insulator String Units Containing Assembly Defects During Mechanical Vibration Fatigue

作　　者：陈国宏 高嵩 黄瑞平 董泽才 刘洋 赵骞 王万里 汤文明[5] CHEN Guohong;LIU Yang;HUANG Ruiping;DONG Zecai;GAO song;ZHAO qian;WANG Wanli;TANG Wenming(Electric Power Research Institute,Anhui Electric Power Co.,Ltd.,State Grid,Hefei 230601,China;Electric Power Research Institute,Jiangsu Electric Power Co.,Ltd.,State Grid,Nanjing 211103,China;China Electric Power Research Institute,Beijing 100192,China;Tongling Power Supply Company,Anhui Electric Power Co.,Ltd.,State Grid,Tongling 244000,China;School of Materials Science and Engineering,Hefei University of Technology,Hefei 230009,China)

机构地区：[1]国网安徽省电力有限公司电力科学研究院,合肥230601 [2]国网江苏省电力有限公司电力科学研究院,南京211103 [3]中国电力科学研究院有限公司,北京100192 [4]国网安徽省电力有限公司铜陵供电公司,安徽铜陵244000 [5]合肥工业大学材料科学与工程学院,合肥230009

出　　处：《电瓷避雷器》2021年第4期203-208,共6页Insulators and Surge Arresters

基　　金：国网公司科技项目“特高压瓷绝缘子零值诊断分析及检测方法研究”(编号:5200-201918084A-0-0-00)。

摘　　要：采用自制试验装置,对无装配缺陷的和铁帽、钢脚歪斜、偏心的盘形悬式瓷绝缘子串元件进行振动疲劳试验,以评价装配缺陷对瓷绝缘子劣化及服役可靠性的影响。结果表明,经过振动疲劳试验后,无装配缺陷的瓷绝缘子基本无结构损伤,绝缘电阻>200 GΩ;相反,振动疲劳在存在装配缺陷瓷绝缘子内外水泥胶装层中诱发微裂纹以及胶装层与瓷件界面脱粘,绝缘电阻大幅降低至10 GΩ以下。铁帽、钢脚偏心瓷绝缘子的结构损伤程度较铁帽、钢脚歪斜瓷绝缘子更大,在外胶装层中形成贯穿性的经纬交织的微裂纹,导致其绝缘电阻和机械强度劣化程度更高。装配偏差缺陷对盘形悬式瓷绝缘子的服役可靠性有明显的影响,今后应对瓷绝缘子中铁帽、瓷件及钢脚同轴度进行明确规范。The mechanical vibration fatigue test of the high-voltage porcelain insulators containing the installation defects,i.e.,skewed steel pin and cap and decentered steel cap and pin was operated employing a self-made equipment,in order to evaluate the effects of the installation defects on degradation and service reliability of the porcelain insulators.The results show that after the mechanical vibration fatigue test,the porcelain insulator without installation defect has no inner structural damage and also has an insulation resistance over 200 GΩ.On the contrary,the mechanical vibration fatigue can induce the microcracks in the inner and outer cementing layers and the debonding between the cementing layer and the porcelain of the porcelain insulators containing the installation defects.As a result,the porcelain insulators have an insulation resistance below 10 GΩ.The structural damage of the porcelain insulators containing the decentered steel cap and pin is higher than that of the porcelain insulators containing the skewed steel pin and cap.In the outer cementing layer of the porcelain insulators containing the decentered steel cap,the microcracks interweave with one another penetrate the whole layer,resulting in more serious degradation of the insulation resistance and mechanical strength of the porcelain insulators.It is concluded that the installation defects have a great effect on the service reliability of the disk suspension porcelain insulators.So,the co-axiality of the steel cap,pin and porcelain insulator should be specified quantitatively in the relative standards.

关 键 词：盘形悬式瓷绝缘子 机械振动疲劳试验 结构损伤 劣化 

分 类 号：TM216[一般工业技术—材料科学与工程]