换流站阀冷却系统是确保换流阀安全、可靠运行的重要支撑。穗东换流站换流变冷却系统电源瞬时性失压后，引起了阀冷却系统内冷水温高报警事故。基于对该事故的分析，找出了事故原因，并提出相应的解决措施。运行结果表明，所提出的改进措施是可行的、有效的。

The valve cooling system of convertor station is the important support for the safe and reliable operation of converter valve. The Suidong converter station alarming accident is caused by the high temperature of the water from the valve cooling system, which originates from the instantaneous voltage lostof the cooling system. In this paper, the accident is analyzed and the solution is also given. The operation results show that the solution is feasible and effective.