乌溪江水电厂一级站——湖南镇水电站3、4号水轮机采用了结构简单、布置紧凑的环形接力器结构。但由于设计、制造加工及安装等方面的原因,接力器密封圈损坏异常频繁、运行5年半已损坏密封圈约150只,并由此引起大量跑油和低油压停机等事故多起。根据现场对接力器活塞运动轨迹的实测和已损坏密封圈的破损情况分析,认为造成密封圈损坏的主要原因是:接力器活塞的运动轨迹 WuXiJiang hydropower station a station - HunanZhen hydropower station 3, 4 using a simple structure, compact layout of the loop relay structure. However, due to the design, manufacture, processing and installation, the relay sealing ring was abnormally damaged, and about 150 pieces of the sealing ring were damaged after 5 and a half years operation. As a result, a large number of accidents such as running oil and low oil pressure stop occurred. According to the on-site measurement of piston locomotion trajectory and analysis of the damage of damaged ring, it is considered that the main reason of damage to the ring is that the motion trajectory of piston