能单独检测芯体电流的双重密封瓷外套交流无间隙金属氧化物避雷器

AC Gapless MOA with Double Sealing on Porcelain Housing for Detecting Exclusive Conductive Current of Active Part

对瓷外套无间隙金属氧化物避雷器(以下简称MOA)密封不良的原因进行了分析。实践证明,采用双重密封结构,取消传统MOA中的隔弧筒和引拔棒,提高了MOA的密封可靠性。同时将MOA芯体与瓷套法兰绝缘,可使MOA在线监测仪在任何气候下都能监测单节及多节元件组成的MOA的芯体电流。

The cause of bad sealing on the porcelain house of gapless metal oxide arrester(MOA)is analyzed.Practice shows that the sealing reliability of MOA have been enhanced by using the double sealing and excluding traditional arc-isolating cylinder and FRP rode.The MOA active part is isolated from flange of housing making the MOA on-line live monitor capable of detecting exclusive conductive current of active part of single unit or multi-units under all weather conditions.