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Second, the turbine fault query software 2.1 Turbine system fault database Turbine system common faults and treatment methods are shown in Table 1. 
On-line Fault Diagnosis System of Turbine Based on NET Technology
I. Steam Turbine System Equipment A power plant turbine is an ultra-supercritical, an intermediate reheat, single-axis, four-cylinder four-bar steam, condensing steam turbine. The steam turbine has a total of 9 steam valves, which are 2 high-pressure main steam valves (ESV), 2 high-pressure steam control valves (CV), 2 medium pressure main steam valves (RSV), and 2 medium-pressure steam control valves (IV). And 1 steam inlet valve, each valve is controlled by 1 oil motor. The turbine has 8 levels of non-adjusted regenerative extraction with 3 high-pressure heaters, 1 deaerator, 4 low-pressure heaters and 1 hydrophobic cooler. The unit is equipped with a high pressure and low pressure two-stage steam turbine bypass system for the start-up of the unit; the auxiliary steam system has a start-up boiler, reheat steam cold end (secondary steam extraction), four-stage steam extraction and auxiliary steam header four-way Steam source; Shaft seal steam system consists of steam turbine shaft seal device, steam seal cooler, shaft seal pressure control valve, shaft seal fan, pressure regulator valve, etc.; main water supply system is equipped with 2 sets of 50% capacity steam feed water pump group and 1 set of 30% capacity electric feed pump set, steam pump and electric pump are equipped with front pump, condensate system is equipped with 2 sets of 100% capacity condensate pumps, and the feed water pump steam turbine and main steam turbine share the condenser, condenser Vacuum system with 3 sets of water ring vacuum pumps; Open cycle cooling water system with 2 sets of 100% capacity vertical mixed flow circulating water pump, electric rotating screen and closed circulating cooling water heat exchanger; closed cooling water system with 2 100% capacity closed-cycle cooling water pump and 100% capacity Quanqin water-water heat exchanger; stator cooling water system consists of 2 sets of 100% capacity centrifugal stator cooling water pump, water filter, water cooler and stator cooling Water tank group Lubricant system consists of main fuel tank, electric AC main oil pump, DC critical oil pump, main tank exhaust fan, electric heater, oil cooler, top shaft oil pump, dual filter, etc.; EH oil system main equipment has fuel tank and Accessories, two AC 100% capacity pumps, anti-fuel oil regenerators, two 100% capacity oil coolers, accumulators, oil filters and oil temperature regulators.