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 Units2. Canceling the operation of any soot blower in the system whenrequired.3. Indication of the soot blower-selected to operate.4. Capability to monitor all the essentials of the soot blowingsystem.5. Capability to prevent continued soot blower operation if thesystem is not functioning properly.6. The ability to operate two soot blowers located in opposite wallssimultaneously.7. Manual over-riding of the automatic operations.8. To prevent automatic blowing when the parameters of sootblowing system are beyond permissible limits.9. Indications of soot blower which has malfunctioned.10. Control circuit for the retractable blowers shall be so designed asto prevent insertion of the blowers into the combustion chamberunless the blowing medium is available.b) Soot blower control system shall also provide for control of blowingsteam pressure, steam temperature (if required) and warm up of thecomplete piping system.vi)TG C&ITurbine Protection System (TPS)Fully proven microprocessor based system, based on hardware andsoftware proven for turbine protection application for the same turbine asbeing offered, shall be provided to achieve the turbine protection action.The turbine protection system shall be as per requirements indicatedbelow or can be implemented as part of standard and proven practice ofthe turbine manufacturer:a) The Turbine Protection System shall meet all applicable safetystandards/requirements including those stipulated in latest edition ofIEC 61508 and IEC 61511 or VDE 0116 Section 8.7, VDE 0160 etc.The system design shall be such that safety function of the totalsystem must not be jeopardized on occurrence of fault. Any singlefault in either primary sensor, input/output modules, controllermodule etc. shall in no way jeopardise the safety of the turbine. Allmodules to be used in this system shall be of fail safe design.150
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsb) The Turbine Protection System shall be implemented in 2 out of 3voting logic. Three independent trip channels each having its owndedicated processing modules, controllers, input/output modules etc.shall be provided to achieve 2 out of 3 voting logic. The outputs ofthe three channels will be used to implement 2 out of 3 voting logicin two relay units, the output of 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 of three voting logic will beimplemented in each of the channels and the output of each channelto be fed to each of the two turbine trip relays.Turbine shall be tripped when either of the above two trip relaysoperates.c) All trip signal inputs required for the safety of the turbine shall bebased on 2 out of 3 logics. The system shall include turbine lock-outrelays, redundant turbine trip solenoids and necessary hardwarerequired for testing.d) The tripping devices shall be designed to operate on DC supply. Thetrip coils shall be monitored continuously for healthiness and failureshall be alarmed.vii) Turbine Governing System for Main TurbineFully proven microprocessor based system, based on hardware andsoftware proven for turbine governing application for the same turbine asbeing offered, 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 of standard and proven practice ofthe 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 of thesteam turbine shall be automatically and safely transferred tomechanical hydraulic control system during operation, in the event ofa fault developing in electro-hydraulic control system. Alternatively,the EHG system shall be provided with 100% hot redundancy i.e. thesystem shall consist of two independent channels right from sensors,transmitters, other field mounted devices, input modules, controllermodules, output devices etc. of the electro hydraulic converter.Further, each of these channels shall be fed from independent powersupplies.151
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Standard Technical Features of BTG System for Supercritical 660 ...

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