Standard Technical Features of BTG System for Supercritical 660 ...
Standard Technical Features of BTG System for Supercritical 660 ...
Standard Technical Features of BTG System for Supercritical 660 ...
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<strong>Standard</strong> <strong>Technical</strong> <strong>Features</strong> <strong>of</strong> <strong>BTG</strong> <strong>System</strong> <strong>for</strong> <strong>Supercritical</strong> <strong>660</strong>/800 MW Thermal Unitsb) The Turbine Protection <strong>System</strong> shall be implemented in 2 out <strong>of</strong> 3voting logic. Three independent trip channels each having its owndedicated processing modules, controllers, input/output modules etc.shall be provided to achieve 2 out <strong>of</strong> 3 voting logic. The outputs <strong>of</strong>the three channels will be used to implement 2 out <strong>of</strong> 3 voting logicin two relay units, the output <strong>of</strong> which will be fed to the two turbinetrip relays.As an alternative, two independent trip channels may be proposed,each having its dedicated and hot redundant processing modules,controllers and I/O modules. Two out <strong>of</strong> three voting logic will beimplemented in each <strong>of</strong> the channels and the output <strong>of</strong> each channelto be fed to each <strong>of</strong> the two turbine trip relays.Turbine shall be tripped when either <strong>of</strong> the above two trip relaysoperates.c) All trip signal inputs required <strong>for</strong> the safety <strong>of</strong> the turbine shall bebased on 2 out <strong>of</strong> 3 logics. The system shall include turbine lock-outrelays, redundant turbine trip solenoids and necessary hardwarerequired <strong>for</strong> testing.d) The tripping devices shall be designed to operate on DC supply. Thetrip coils shall be monitored continuously <strong>for</strong> healthiness and failureshall be alarmed.vii) Turbine Governing <strong>System</strong> <strong>for</strong> Main TurbineFully proven microprocessor based system, based on hardware ands<strong>of</strong>tware proven <strong>for</strong> turbine governing application <strong>for</strong> the same turbine asbeing <strong>of</strong>fered, shall be provided to achieve the turbine governing action.The turbine governing system shall be as per requirements indicatedbelow or can be implemented as part <strong>of</strong> standard and proven practice <strong>of</strong>the turbine manufacturer:a) The turbine generator unit shall be equipped with electro-hydraulicgoverning (EHG) system backed-up by mechanical-hydraulic controlsystem. The system shall be designed such that the governing <strong>of</strong> thesteam turbine shall be automatically and safely transferred tomechanical hydraulic control system during operation, in the event <strong>of</strong>a fault developing in electro-hydraulic control system. Alternatively,the EHG system shall be provided with 100% hot redundancy i.e. thesystem shall consist <strong>of</strong> two independent channels right from sensors,transmitters, other field mounted devices, input modules, controllermodules, output devices etc. <strong>of</strong> the electro hydraulic converter.Further, each <strong>of</strong> these channels shall be fed from independent powersupplies.151
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