Standard Technical Features of BTG System for Supercritical 660 ...

Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsinsulation under such operating conditions, butshall be lower than those permissible forThermal Class155(F) insulation as per IEC-60034.ii) Power factor0.85 (lag)iii) Terminal voltage As per manufacturer’s practiceiv) Frequency50 Hzv) Speed 3000 rpmvi) Short circuit ratio ≥ 0.48vii) Efficiency > 98%16.1.3 System of coolingi) Stator winding Closed loop system using Hydrogen or usingdemineralised water flowing through thehollow conductors.ii) Rotor windingDirectly cooled by hydrogen. Alternatively,manufacturer’s standard and provenarrangement of rotor cooling with water shallalso be acceptable.iii) Stator coreiv) Configuration forhydrogen coolingv) Capacity with reducedcooling16.1.4 InsulationStator and RotorwindingsCooled by hydrogen flowing through the radialand/ or axial ventilating ducts or water cooled.Generator to be designed for hydrogen pressureas per manufacturer’s practice. The shaftmounted fan(s)/ blower(s) to be provided onone or both sides to facilitate circulation ofhydrogen inside the machine. Hydrogen to becooled by coolers using demineralised watermounted on the stator body.Capable of delivering at least two-third of therated and maximum continuous MVA with ten(10) percent of tubes in each cooler pluggedwithout exceeding the temperature limits ofthermal class 130(B) and thermal class 155(F)respectively.Class 155(F)16.1.5 Operational requirementsGenerator shall be capable of delivering rated output under followingoperational conditions:123