Substation Automation System And A.C. KIOSKS - Hvpn.gov.in

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3.2.2 MEASUREMENTS:Analogue inputs for voltage and current measurements shall be connecteddirectly to the voltage transformers (VT) and the current transformers (CT)without intermediate transducers. The values of active power (W), reactive power(VAR), frequency (Hz), and the rms values for voltage (U) and current (I) shall becalculated.The measured values shall be displayed locally on the station HMI and in thecontrol centre. The abnormal values must be discarded.The analogue values shall be updated every 2 seconds.Threshold limit values shall be selectable for alarm indications.Suitable no. of Transducers shall be provided to facilitate the flow of 4-20mAAnalogue signals as per Annexure–I from the bay level equipments (i.e circuitbreaker, AC Kiosks, Transformers, etc.) to its respective C&R Panel BCU andStation level equipments (i.e. ACDB, DCDB, Battery Chargers, L.T. Transformer,Generator, etc.) to station auxiliary BCU, as per its respective approveddrawings, for remote control & supervision at Station HMI’s thereof by thesuccessful SCADA supplier.3.2.3 EVENT AND ALARM HANDLING:Events and alarms are generated either by the switchgear, by the control IEDs,or by the station level unit. They shall be recorded in an event list in the stationHMI. Alarms shall be recorded in a separate alarm list and appear on the screen.All, or a freely selectable group of events and alarms shall also be printed out onan event printer.The alarms and events shall be time-tagged with a time resolution of 1 ms.3.2.4 STATION HMI:3.2.4.1 SUBSTATION HMI OPERATION:On the HMI the object has to be selected first. In case of a blocking orinterlocking conditions are not met, the selection shall not be possible and anappropriate alarm annunciation shall occur. If a selection is valid the positionindication will show the possible direction, and the appropriate control executionbutton shall be pressed in order to close or open the corresponding object.Control operation from other places (e.g. REMOTE) shall not be possible in thisoperating mode.3.2.4.2 PRESENTATION AND DIALOGUES:GENERAL:The operator station HMI shall be a redundant with hot standby and shall providebasic functions for supervision and control of the substation. The operator shallgive commands to the switchgear on the screen via mouse clicks or keyboardcommands.The HMI shall give the operator access to alarms and events displayed on thescreen. Aside from these lists on the screen, there shall be a printout of alarms orevents in an event log.An acoustic alarm shall indicate abnormalities, and all unacknowledged alarmsshall be accessible from any screen selected by the operator.The following standard pictures shall be available from the HMI:C:\Users\itms\Downloads\SAS Spec. (1).doc - 8 -
a) Single-line diagram showing the switchgear status and measured valuesb) Control dialogues with interlocking and blocking details.This control dialogue shall tell the operator whether the device operation ispermitted or blocked.a) Measurement dialoguesb) Alarm list, station / bay-orientedc) Event list, station / bay-orientedd) System status3.2.4.3 HMI DESIGN PRINCIPLES:Consistent design principles shall be adopted with the HMI concerning labels,colors, dialogues and fonts. Non-valid selections shall be dimmed out.The object status shall be indicated using different status colors for:a) Selected object under commandb) Selected on the screenc) Not updated, obsolete values, not in use or not sampledd) Alarm or faulty statee) Warning or blockedf) Update blocked or manually updatedg) Control blockedh) Normal state3.2.4.4 PROCESS STATUS DISPLAYS AND COMMAND PROCEDURES:The process status of the substation in terms of actual values of currents,voltages, frequency, active and reactive powers as well as the positions of circuitbreakers, isolators and transformer tap-changers shall be displayed in the stationsingle-line diagram.In order to ensure a high degree of security against undesired operation, a"select-before-execute" command procedure shall be provided. After the"selection" of a switch, the operator shall be able to recognize the selecteddevice on the screen, and all other switchgear shall be blocked. Ascommunication between control centre and device to be controlled is established,the operator shall be prompted to confirm the control action and only then finalexecute command shall be accepted. After the “execution” of the command theoperated switching symbol shall flash until the switch has reached its newposition.The operator shall be in a position to execute a command only, if the switch isnot blocked and if no interlocking condition is going to be violated. Theinterlocking statements shall be checked by the interlocking schemeimplemented at bay and station level.After command execution the operator shall receive a confirmation that the newswitching position has been reached or an indication that the switching procedurewas unsuccessful with the indication of the reason for non-functioning.3.2.4.5 SYSTEM SUPERVISION & DISPLAY:The SAS system shall be comprehensively self-monitored such that faults areimmediately indicated to the operator, possibly before they develop into seriousC:\Users\itms\Downloads\SAS Spec. (1).doc - 9 -
Page 3 and 4: 1.0 GENERAL:The substation automati
Page 5 and 6: The GPS time synchronizing signal (
Page 7: 3.1.1.3 SYNCHRONISM AND ENERGIZING
Page 11 and 12: a) The date and time of the alarmb)
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Page 17 and 18: alarm/event list etc. displayed sha
Page 19 and 20: i. Indicationii. Commandsiii. Measu
Page 21: shall be reset to the corresponding
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Page 31 and 32: 1.0 CONSTRUCTION:SPECIFICATION OF A
Page 33 and 34: enters through panel joints, holes

Substation Automation System And A.C. KIOSKS - Hvpn.gov.in

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