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 Unitsb) All analog signals for control purpose shall be acquired, validated,processed and their respective data base updated at a maximuminterval of 250 milli-seconds except for some fast-acting controlloops for which the above-referred time shall be as per processrequirement. For signals required for information only, the abovefunctions shall be performed at an interval of within 1 second.c) The 4-20 mA input analog cards shall be suitable for interfacingtransmitters giving 4-20mA analog signal along with superimposedHART interface signals. 4-20 mA DC signal will only be used forcontrol purpose and superimposed HART signal will be used forconfiguration, maintenance diagnostic and record keeping facility forelectronic transmitters and analysers etc. For non-HART 4- 20mAanalog inputs, conventional non-HART AI module shall be applied.ii)Binary Signal Conditioning & Processinga) The changeover type contacts (i.e. 'NC' + 'NO' together) shall bewired to the control system for all the binary inputs required forcontrol purposes, except for inputs from MCC/switchgear, actuatorsand inputs related to hardwired signal exchange among variousfunctional group for which non-changeover type contacts ('NC' or'NO') shall be wired to the control system. The binary inputsrequired for information purposes only shall be wired to controlsystem in the form of non-changeover type contacts.b) The conditioning and processing functions to be performed as aminimum for the binary inputs coming for control and informationpurposes shall be:1. 24V/ 48 V DC power supply for contact interrogation for allpotential free contacts with per point fuse protection or suitablecurrent limit feature/ isolation through opto-coupler.2. Contact bounce filtering delay time of 15 milliseconds.3. Facility for pegging the binary signal to logic one/zero or lastcorrect value in case of failure of binary input module.4. Binary signal distribution to different users shall be in such away so as to ensure that a short/ground fault on one user is notreflected to the other user.5. Implementation of multiple measurement schemes for signalsfor control purpose.6. All binary signals shall be acquired, validated, processed, alarmchecked and their data base updated within one second. Inaddition to this requirement, binary signals required for SOEshall have a resolution of 1millisecond.140
Standard Technical Features of BTG System for Supercritical 660/800 MW Thermal Units7. Facility to delete any binary input from scan or to return to scanon operator demand.iii)Triple Measurement Schemea) Triple measurement scheme for analog inputs employing threeindependent transmitters connected to separate tapping points shallbe employed for the most critical measurements used in analogcontrol functions including but not limited to furnace draft, feedwater flow, turbine throttle pressure, turbine first stage pressure,deaerator level, turbine speed.b) Individual transmitter signal, their status and selected value forcontrol/measurement shall be available on OWS.iv)Dual Measurement Schemea) Dual measurement scheme for analog inputs employing twoindependent transmitters, connected to separate tapping points/temperature element shall be employed for the remainingmeasurements used for analog control functions.b) Individual transmitter signal, their status and selected value forcontrol/measurement shall be available on OWS.v) For binary and analog inputs required in furnace and turbine protection,triple sensing devices shall be provided. Binary and analog inputs whichare required for protection of more than one equipment (e.g. deareatorlevel very low etc.) as well as protection signals for turbine driven boilerfeed pump (TDBFP)/ motor driven boiler feed pump (MDBFP), triplesensing devices shall be provided. For other critical binary and analoginputs required for protection and interlock purpose of other equipment(e.g. those interlocks which may result in loss of generation, nonavailabilityof a major equipment etc.), dual sensors shall be provided.However, for bearing temperature of FD/ID/PA fans, mills, APH, BFP,CEP and their HT drives, single sensor can be used.17.2.3 Functional grouping of controllersi) Functional grouping of various controllers shall meet following generalrequirements:a) Process redundancies shall be maintained. For example, in case themechanical equipment has been provided with redundancy, thedrive shall not be controlled by a common controller and it shall beensured that there is no sharing of controller components betweenindependent groups.141
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