CORE BUSINESS OPERATION

• To provide operation and maintenance services for hydropower plants;
• To provide the minor and major overhaul for hydropower plants and substations;
• To joint-venture with domestic and abroad companies;
• To support engineers & experts for O & M services in hydropower plants & substations.

SCOPE OF OUR SERVICES

• Operation & Maintenance Services (O&M)
• Personal Supply Agreement (PSA)
• Preventive & Corrective Maintenance Services
• Minor & Major Overhaul Services
• Engineering & Planning Services
• Joint Venture

Routine Hydropower Operation & Maintenance

• Reservoir Management & Forecasting.
• Turbine functional checks and inspection.
• Turbine bearing lubrication and inspection.
• Gearbox inspection.
• Gearbox oil condition analysis and oil changes.
• Gearbox bearing inspection and lubrication.
• Drive belt inspection and replacement.
• Drive coupling inspection.
• Generator inspection.
• Generator bearing inspection and lubrication.
• Hydraulic system inspection.
• Air gap and Partial discharge monitoring.
• Hydraulic system oil condition analysis and oil changes.

• Check all sensors operate correctly.
• Check controller functions correctly.
• Inspection of intake area, impounding structures, pipeline, sluice(s).
• Inspection of cooling system (heat exchanger, water pumps).
• Inspection of Drainage and sump pump system
• Visual inspection and record temperature & oil tank of main transformer.
• Inspection of switch yard, switch gear, 22 KV transmission line, excitation, governor (control system, mechanical system and oil pump), power supply (AC, DC, battery and battery charger).
• Seepage, leakage, crack and sediment monitoring.

Non-routine Hydropower Maintenance

• Turbine & Generator shaft centering adjustment, installing & realignment
• Gravitation welding of runner blade
• Transformers (oil breakdown, oil purifier, minor overhaul, installation, insulation resistance measurement).
• Oil or lubricant (oil filter and old replacement).
• Generator annual inspection.
• Circuit breaker annual inspection.
• Control system (checking and repair or replacement all equipment / auxiliaries
• Bearing replacement.
• Changing drive couplings and belts, including realignment.
• Sensor replacement and calibration.
• Controller optimization / reprogramming.

• Internal (endoscopic) inspections of turbines and gearboxes.
• Major mechanical / electrical or civil engineering repairs and refurbishments.
• Test, record and report of all auxiliary equipment
• Pipeline pigging.
• Pipeline external and internal inspections.
• Weir condition surveys.
• Flow rate measurements (to verify turbine performance and consent compliance).
• Hydraulic accumulator testing and recharging.
• Electrical inspection and testing.
• Automated intake screening system maintenance.
• Hydro system performance and operational reviews / optimization.
• Environmental permit compliance.

OPERATION & MAINTENANCE SERVICES FOR HYDRO POWER PLANTS

PSA-KOWEPCO Xepain-Xenamnoy – 410MW 

PSA-EGAT Nam Lik 1 – 65MW

Nam Khan 3 – 60MW

Xeset 3 – 23MW

(E&E) Nam Theun 1 – 650MW

PSA-SINOHYDRO B10
 Don Sahong ~ 260MW

Nam Chiane – 104MW

Tad Salen – 3.2MW

Nam Ngum 1 - 235MW

Nam Khan 2 ~ 130MW

Houay Lamphangnai - 88MW

Xeset 2 - 76MW

Nam Leuk - 60MW

Xeset 1 - 45MW

Nam Mang 3 - 40MW

Nam Sana - 14MW

MAINTENANCE EXPERIENCES FOR HYDRO POWER PLANTS

OPERATION & MAINTENANCE

MINOR OVERHAUL

MAJOR OVERHAUL

POWER TRANSFORMER MAINTENANCE

STATOR WINDINGS INSPECTION

THRUST BEARING REFURBISHMENT