We conducted routine inspections and maintenance on our self-built Kaplan axial-flow 3000KW and Shaft-extension-flow 2500KW hpps. 另起一行：The shaft-extended axial turbine unit adopts a horizontal shaft arrangement, and the generator is directly installed in the powerhouse, making inspection and maintenance extremely convenient. It is suitable for riverbed power stations with lower head (2.5-18m) and large flow. Kaplan units are vertically shafted and suitable for low to medium head and high flow conditions (typically 3-30m head), making them the mainstay unit type for low head power plants. 第三段：Overhaul of the Shaft extention flow turbine unit: Inspection of main shaft seal, guide bearing, and governor; Inspection of runner chamber and tailrace flow channel; Inspection and maintenance of generator carbon brushes and slip rings; Leak detection and calibration of oil, gas, and water auxiliary systems.Kaplan turbine overhaul
Inspection and adjustment of runner chamber and guide vane mechanism clearances
Lubricating oil quality testing and clearance measurement of water guide bearings and thrust bearings
Static/dynamic testing of governor system
Insulation testing of generator stator and rotor 第四段：The core objectives of regular maintenance are:

To proactively identify potential problems: Avoiding common issues in low-head turbines such as cavitation, vibration, and shaft seal leakage.

To maintain unit efficiency: The efficiency of Kaplan and Shaft flow turbine is highly sensitive to clearance and blade profile; regular maintenance helps maintain design output.

To extend equipment lifespan: Especially for small and medium-sized units, regular maintenance significantly reduces the failure rate and ensures long-term stable power generation.