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

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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsii)Suitably sized hydraulic accumulators shall be provided in governingoil system to maintain system pressure, when there is a change overfrom one running pump to stand by oil pump. Also provision shall bemade for initial air purging of the governor system.15.7.9 Drive turbine exhausti) The drive turbine exhaust shall be separately piped to the maincondenser of the TG unit. Motorised butterfly valve shall be providedin each exhaust duct of BFP turbine for its isolation when not in use.ii)Alternatively separate condenser for the drive turbine may be provided.In such a case the size criteria for same shall be as applicable for themain condenser. Condenser air evacuation system and condenser onload tube cleaning system shall also be applicable for the condenser forBFP drive turbine. Also 2 x 100% condensate extraction pumps shallbe provided for removal of condensate from condenser of BFP driveturbine to main condenser.121
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal UnitsCHAPTER – 16GENERATOR AND AUXILIARY SYSTEMS16.1 GeneratorThe turbo-generator set with all auxiliary systems and accessories shall havefollowing features/ parameters:16.1.1 Type 3-phase, horizontal mounted, 2-pole cylindricalrotor type, directly driven by steam turbinerunning at rated speed conforming to the latestversion of IEC-60034-1, 60034-3 or otherequivalent international standards.16.1.2 Ratingi) Rated Output 776MVA for 660 MW or941 MVA for 800 MWGenerator and its excitation system shall havecapability to at least match the declaredmaximum continuous rated output of theassociated steam turbine (for the secondarycooling water temperature of 39 0 C) at all powerfactors between 0.85 lagging and 0.95 leadingwith +3% to -5% frequency variation, terminalvoltage variation of +/-5% as per IEC-60034-3and combined voltage & frequency variation of5%. It shall be ensured that when the Generatoris working at this capability and cooling watertemperature is 39 0 C, no part of the Generatorshall attain a temperature in excess of thetemperature limits specified for Thermal Class130(B) insulation as per IEC-60034.Also the generator and its excitation systemshall be capable of continuous stable operationwithout any excessive temperature rise at thepeak output of the associated steam turbineunder VWO and HP heaters out conditions, etc.as available for the secondary cooling watertemperature of 39 0 C at all power factorsbetween 0.85 lagging and 0.95 leading with+3% to -5% frequency variation, terminalvoltage variation of +/-5% and combinedvoltage & frequency variation of 5%.Temperature of different parts may exceedthose permissible for Thermal Class130(B)122
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