Fault Diagnosis of Steam Turbine Tunnel

The routine test for the flexible of the main steam stop valves was made after one more month of the overhaul of the unit No. 11 in Wujing Power Plant.Under the condition of the six governing valves completely opened,the unit's load only reached 296 MW.According to this problem,the fault' postition,occurrence's time and serious extent for the steam turbine passage were successfully diagnosed by means of contrast analysis and calculation fore-and-aft operational data of the heavy repair and test.Owing to the unit was repaired in time,more serious destructions of the steam turbine tunnel would be avoided.The diagnostic methods are applied to other fault in respect of the steam turbine tunnel too. Figs 5 and tables 3.