广州发电厂1号汽轮机电超速保护系统的改进

Retrofit of electric over-speed protection of Unit 1 steam turbine in Guangzhou Power Plant

广州发电厂1号汽轮机在一次甩负荷试验中发现该机组甩全负荷动态特性不合格,转速飞升过高。主要原因是电超速保护系统的设计存有缺陷,高压油动机动作延迟。针对这种情况,进行了相应的改造,在高压油动机两侧机底各加装两个电磁阀,加快了甩负荷过程中汽门的关闭。改造后,经过多年的考验,运行稳定可靠。这种方法可应用于同类型机组中。

Unit 1 steam turbine in Guangzhou Power Plant did not pass the fullload rejection test,the wheeling speed raised too much higher. The accident was mainly due to the defect in the design of electric overspeed protection,the response of HP oilpower machinery deferred much longer. Consequently,the according retrofit was carried out and two electromagnetic valves were added on every side of the HP oilpower machinery to accelerate valve closing during load rejection. Satisfactory operation results were obtained after the retrofit. This way can be used in the same type steam turbine.