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Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsii)iii)iv)Sensor head shall be protected from hot gas, particulate matter, andcorrosive elements in the flue gas by suitable protective tube andenclosure which will however not block the sound waves. The probesshall have a minimum life of 20,000 hours of operation. All the partscoming into contact with hot gas shall be designed to withstand thehigh temperature. Air purging arrangement for sensors includingsolenoid valves, piping, SS/Cu-tubing, hoses, root valves, isolationvalves, air filter regulators shall be provided.Display on the PC shall be provided with a mimic display indicatingthe sensor locations so as to provide a means to physically locate thelistening channel and to indicate the alarm condition to show the sensorlocation which is picking up the present dB alarm level. The systemshall continuously monitor the sound level of all the channel and willactivate an alarm at a predetermined sound level. The soot bloweroperation will also be indicated so as to prevent a false alarm duringsoot blower operation. Suitable means shall also be provided to listento any channels so as to check and monitor the sound level, especiallyduring an alarm. The ASLD system shall be connected to SG C&Isystem through hard wiring/ soft link.Use of structure borne sensors in place of air borne sensors for some orall of the areas shall be acceptable, if it is the standard practice of theOEM.17.3.10 Turbine supervisory system (TSS)i) The turbine supervisory equipment shall be complete includingsensors, transmitters, converters, limit value monitors, measuring andamplifier modules, power supplies etc. with the required accessoriesincluding twisted and shielded instrumentation cables, compensatingcables, junction boxes etc.ii)Following measurements shall be provided also keeping in view thestandard and proven practice of the OEM:a) Shaft eccentricity detection.b) Absolute as well as relative shaft vibration measurement in both X& Y direction.c) Differential expansion of rotor and cylinder for HPT, IPT andLPT.d) Overall expansion of HPT and IPT.e) Absolute bearing vibration measurement of each bearing in both X& Y directions.f) Axial shift of the rotor, (three sensors).g) Turbine speed, (three sensors).166
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsh) Emergency stop and control valve position.i) Main steam and hot reheat steam inlet temperature and pressure.j) Bearing metal and drain oil temperature.k) Turbine casing metal temperature.l) In case of vibration, shaft mounted reference detectors andrequired supervisory instrument circuitry shall also be provided.m) Any other measurement necessary for safe and reliable operationof the turbine.iii) The system shall be provided with suitable hardware and softwaresignal processing and shall be capable of signal distribution andinterfacing with other control systems and MMIPIS system.iv)For all vibration measurements indicated under (ii) above, aMicroprocessor/computer based system shall also be provided toachieve the following functions:a) On-line spectrum/harmonic analysis.b) Identification of the exact nature of failure resulting in increase inbearing vibration and direct message on the TFT indicating theexact nature of fault e.g. misalignment, shaft crack, bearinglooseness etc. through use of intelligent software packages.c) Storage and comparative analysis of vibrations.d) Generation/ analysis of bode plot/ orbit plot and time waveform/nyquist plot/ shaft centre line plot/ cascade and water fall plot.v) All the vibration parameters as well as turbine supervisory parametersshall also be fed to the turbine control system (TCS) throughhardwiring or through suitable link so that all these parameters aresuitably displayed on the TG control TFTs. All required I/O cards andother processing modules etc. shall be provided for this purpose.vi)Test calibration jigs for site calibration of all sensors of TSS shall beprovided.17.3.11 BFP turbine supervisory instrumentsi) The supervisory equipment/ instruments shall be provided for BFPturbine for detection, indication, recording, monitoring and diagnosticsof the following also keeping in view the standard and proven practiceof the OEM:a) Shaft eccentricity.b) Axial shift, (with three pickups).167
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