一起输电线路OPPC接头盒故障分析

Failure Analysis of OPPC Connector Box for Transmission Line

光纤复合架空相线接头盒是架空输电线路重要的接续保护装置,起到光电隔离、机械连接的作用。文章对一起OPPC接头盒故障进行分析,通过试验测试、解体观察等对故障原因作出研判,明确了环氧树脂与玻璃纤维管交界面处存在气泡与局部气隙,导致内部电场分布不均匀,引发局部放电,局部放电产生的电热应力使得环氧树脂碳化,持续破坏环氧树脂与玻璃纤维管的绝缘,最终形成贯穿性放电通道,设备因电热应力由内而外膨胀炸裂。

OPPC connector box is an important connection protection device for overhead transmission lines,which plays the role of photoelectric isolation and mechanical connection.In this paper,an OPPC connector box fault is analyzed,and the cause of the fault is judged through experimental tests and disintegration observations,and it is clarified that there are bubbles and local air gaps at the interface between epoxy resin and fiberglass pipe,resulting in uneven distribution of internal electric field,causing partial discharge,and the electrothermal stress generated by partial discharge makes the epoxy resin carbonized,continuously destroys the insulation between epoxy resin and glass fiber pipe,and finally forms a penetrating discharge channel,and the equipment expands and explodes from the inside out due to electrothermal stress.