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 Unitsxiii) Shaft grounding andvoltage monitoringxiv) Stator winding barswater temperaturemonitoringxv) Rotor windingtemperature monitoring(for static excitationsystem)xvi) Rotor flux monitoringxvii) Partial dischargemonitoringxviii) Vibration monitoring(if required)xix) Liquid leakage detectorShaft riding brushes for shaft grounding andvoltage monitoring system complete with allsoftware and hardware to be provided as permanufacturer’s proven practice.On line monitoring system complete with allsoftware and hardware and as permanufacturer’s proven practice to be providedto detect any abnormalities in the temperaturefor individual stator bars.Suitable arrangement as per manufacturer’sproven practice to be provided for rotorwinding temperature measurement.Sensors for to be provided complete with allsoftware and hardware to detect turn to turnshorting in field winding.Sensors for to be provided for on-line partialdischarge (PD) monitoring complete with allsoftware and hardware.Optical sensors (at least 6 nos.) for vibrationpickups at each end of over hang portion of thewinding to be provided.To be provided at all the low level points insidethe generator casing including end shields.16.2 Generator Auxiliary Systems16.2.1 Gas system ( for hydrogen and water cooled machines)i) General Each generator to be provided with H 2 andCO 2 gas supply system including gasmanifolds, CO 2 heating system (if necessary),hydrogen pressure regulator, etc.ii) Requirement of gascylindersiii) Hydrogen driersRequirement for one start-up and one shutdownof a unit plus those required to beconnected on manifolds of all the units plustotal requirements for 7 (seven) daysconsumption of all the units to be furnished.2x100% duty to maintain the H 2 inside themachine dry with 0 0 C dew point at operatingpressure with provisions to preventcondensation.129
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsiv) Dryer typeReactivation/ Refrigeration/ Manufacturer’spractice.v) Valve inter-locking 3-way valve used along with the drier forinterconnecting the H 2 and air line (asapplicable) preferably have mechanical interlocking,such that closing of the H 2 side portis positively ensured before opening of the airside port.vi) On-line dew pointmeasurementvii) Gas analyserviii) Portable gas analyzerTo be provided across the inlet and outletlines to the drying system.To be provided with thermal conductivity/ gasdensity based type to continuously analyzethe gas discharged from the casing duringpurging and also analyze samples of thecasing H 2 during normal operation.The analyzer to measure the gas purity underthe following three conditions :a) Normal percentage of purity of H 2 in air inthe generator casing. Purity range toinclude a low purity alarm.b) Percentage of H 2 in CO 2 leaving the casingwhen H 2 is being admitted or expelled.c) Percentage of air in CO 2 leaving the casingwhen CO 2 is being admitted or expelled.Similar as detailed above under clause "GasAnalyzer" to be provided for supervision ofthe gas purging operation.16.2.2 Seal oil systemi) General A complete seal oil supply and control systemincluding AC and DC motor operated pumpsets, coolers, etc.ii) Number of pumps 2x100% AC motor driven pumps. 1 no. 100%DC motor driven pump.iii) Emergency conditionDuring short time emergency, which mayarise due to non-availability of both AC andDC pumps, unit may be tripped and seal oilsupply for such coasting down period shall befrom a suitable arrangement from lubricationoil system or a damper tank or as permanufacturer’s proven practice.130
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Standard Technical Features of BTG System for Supercritical 660 ...

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