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 Unitsc) Data transmitting speed shall be sufficient to meet the responses ofthe system in terms of displays, control etc. under worst possibledata loading condition and minimum 20% spare capacity shall beavailable for future expansion.d) UTP cables or coaxial cables or fibre optic cables shall be employedfor system bus.e) In case of any distance or other limitation, provision of suitablerepeaters, MODEMS, amplifiers, special type of cables like opticalfibres etc., as required, shall be made to make the DCS fullyoperational.ii)Station LANThe servers/ ethernet LAN of the each unit shall be connected to astation wide ethernet Local Area Network (LAN). The PCs at variousplant locations and PLC/PC based systems shall be connected to thisstation wide ethernet LAN through TCP/IP protocol. The stationhead/O&M head & shift in-charge shall be located in this LAN tomonitor data of all units as well as of the common plants and off-siteplants.A server shall be provided for this station wide LAN. All networkingfunctions of LAN, calculation including merit order calculation shall beperformed in this server.17.2.10 Sequence of events (SOE) recording systemi) The DDCMIS shall be provided with sequence of events (SOE)recording system capable to scan and record events in the sequence ofoccurrence within a resolution of one (1) millisecond. That is, all SOEpoints entering status change shall be reported and time tagged within1 (one) millisecond of their occurrence. Input card shall be equippedwith digital filters with filter delay of minimum 4ms (identical for allpoints) to eliminate contact bounce such that field contact which ischanging state must remain in the new state for successive 4 ms to bereported as one event. The start of data collection for SOE report shallbe reported to OWS within 1 sec of SOE data collection initiation. Thesystem shall also have provision of rejection of chattering inputs.ii)The system shall also include provision for historical storage andretrieval of SOE reports for 3 months period.iii) The SOE report collection shall begin on occurrence of change ofstatus of any SOE point and shall be printed after an operatorselectable time interval of 1 to 3 min. or 100 status changes have takenplace after the first event. Adequate memory to accommodate 6 (six)SOE reports i.e., two buffers of 100 status changes each shall beprovided. Seventh SOE report shall overlap the first SOE reportmemory and so on.160
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Unitsiv)The SOE reports shall also include a list of major equipment trip inchronological order and include the points which initiated SOEcollection.17.2.11 Annunciation system functionAnnunciation system shall be LVS based with top portion of all the LVSreserved for annunciation with 3/4 bands for different priority. It shall beimplemented as an inbuilt function of the DDCMIS. The field contacts shallbe acquired through DDCMIS only. The annunciation sequence logic shallbe implemented as a part of the DDCMIS controllers.17.2.12 Master & slave clock systemi) Master and slave clock system shall be provided to ensure uniformtime indication throughout the various plant facilities and timesynchronisation between control system, MMIPIS, switchyarddisturbance recorder, other PLCs etc.ii)iii)iv)The system shall be complete with receiving antennae (for receivingtime from satellite & radio signal), receiver and associated electronics,redundant master clocks, slave clocks, interconnecting cables, cubicles,power supplies & any other accessories. Master clock system shall bedesigned to provide internal time reference if GPS signal from Antenna is notavailable. A provision shall also be kept for synchronisation of themaster clock with some other identified source.The master clock shall drive the slave display units. It shall be ensuredthat loss of any slave display unit does not affect the display of anyother slave unit. The MMIPIS, shall be synchronised with the masterclock once in every hour. The switchyard event recorder and otherplant PLCs shall be synchronised with the master clock once everyminute.The master clock shall be located in the control room and shall havefacility for automatic synchronising with external radio/ satellitesignals.v) Adequate no. of, say 10 to 15 slave clocks shall be provided, to belocated at the various plant sites.17.3 SG & TG Related Other Control & Instrumentation Systems/Equipments17.3.1 Flame monitoring systemi) Flame monitoring system shall be provided to detect the individualflame and to enhance the boiler/furnace safety, to avoid spurious andunwarranted trips and to increase operational reliability, availabilityand efficiency of the Steam Generator such that the consumption offuel oil shall be reduced to optimal minimum.161
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