1.Meter installation database and its up-dating on a regular interval. 2.Meter testing details and last testing done 3.Downloading of data and transmission of the same to RLDC 4.Data Collecting Device and accessories 5.Data processing, data validation and checking 6.Time synchronization of meters 7.Software and its up-gradation related to the meters and data processing PRESENTATION BY SRLDC ON SEMS

8.Internal Auditing 9.Pool account, Reactive account and IRE account. 10.MIS related to metering 11.Archival and Storage 12.Revised requirement of meters and DCDs for the year , Utilization of RS-485 port for automatic meter data downloading. 14.Future Plan and roadmap. 15.Any other issues related to metering and settlement. PRESENTATION BY SRLDC ON SEMS

Meter testing details and last testing done During the period 1998,1999 and 2000 the SEMs have been tested in CPRI. Details

Archival and Storage. Presently the data is stored in a separate PC Back up is taken on CDs.

Software and its up-gradation related to the meters and data processing Source code is given to the requested RLDCs

MIS related to metering RSTPSNLC TALCHER STAGE II KAPS MAPSCTUSR INTER STATE APKARNATAKAKERALATAMILNADU PUDUCHERRY GOAPG HVDCNLC MINES

Internal Auditing Presently in the same department all the checking and validation is carried out. In the same RLDC with another department may be entrusted to carry out checking and validation.

Pool account, Reactive account and IRE account Pool account is operated by SRLDC and as on date there is no default of UI payment on any constituent. Reactive account is operated by SRLDC and as on date there is no default of payment by constituents. IRE account ER – SR : No payment outstanding WR – SR : WR has to pay the amount

Time synchronization of meters FIRST WEEK OF EVERY MONTH ALL THE SUBSTATIONS WILL CHECK THE METER TIME WITH GPS TIME AND A REPORT WILL BE SENT TO SRLDC. IF THE TIME DRIFT IS MORE THAN ONE MINUTE, THE SUBSTATTON ITSELF WILL CORRECT THE TIME WITH DCD. REGULARLY EVERY WEEK SRLDC WILL RUN A PROGRAM TO CHECK THE TIME DRIFT AND IF IT IS FOUND, INSTRUCTIONS WILL BE ISSUED TO THE CONCERNRED SUBSTATION TO CORRECT THE TIME DRIFT. Details

Data Collecting Device and accessories FOR DOWN LOADING THE DATA FROM SEMS THE FOLLOWING ARE USED –DCD –A CABLE WITH OPTICAL HEAD AT ONE END AND THE OTHER END RS232 COMPATIBLE PORT –A CABLE TO CONNECT TO PC OR LAPTOP Details

SUMMARY OF SEMs IN SOUTHERN REGION Ref. No. Agency No. of locations No. of meters B-Type (SMLold) Total No. of meters A-Type SML(old) SML (new) L&T 2000 series 4000 series (A)NTPC (B)NLC # (C )NPC (D)APTRANSCO (E)KPTCL (F)KSEB (G)TNEB (H)PONDICHERRY (I)GOA (J)NLC Mines14 *008 *012 * (K)PG-HVDC31 * 7 *009 * (L)CTU(POWERGRID) (O)TOTAL * # This includes 58 Nos. and 14 nos. of A type meters installed by NLC at NLC-TS-II and NLC TPS-I Exp. respectively. All other meters at NLC are installed by POWERGRID * Meters not considered in SR Total 12 NLC Mines meters in (J) are included in (B) also. 3 PG-HVDC meters in (K) are included in (L) also. 6 PG-HVDC meters in (K) are included in (N) also Details

Responsibility of SEM data collection and transmission to RLDCs Relevant extracts from Terms and Conditions of Tariff Regulations, Metering and Accounting: Metering arrangements, including installation, testing and operation and maintenance of meters and collection, transportation and processing of data required for accounting of energy exchanges and average frequency on 15 minute time block basis shall be organised by the Central Transmission Utility/Regional Load Despatch Centres. All concerned entities (in whose premises the special energy meters are installed), shall fully cooperate with the Central Transmission Utility/Regional Load Despatch Centre and extend the necessary assistance by taking weekly meter readings and transmitting them to the Regional Load Despatch Centre. Processed data of meters along with data relating to declared capability and schedules etc., shall be supplied by the Regional Load Despatch Centres to the Regional Power Committee or the Regional Electricity Board and the Regional Power Committee or the Regional Electricity Board shall issue the Regional Accounts for energy on monthly basis as well as UI charges on weekly basis. UI accounting procedures shall be governed by the orders of the Commission.

Relevant extracts from Revised IEGC The CTU shall install special energy meters on all inter connections between the regional constituents and other identified points for recording of actual net MWh interchanges and MVArh drawals. The type of meters to be installed, metering scheme, metering capability, testing and calibration requirements and the scheme for collection and dissemination of metered data are detailed in the enclosed Annexure-2. All concerned entities (in whose premises the special energy meters are installed) shall fully cooperate with the CTU/RLDC and extend the necessary assistance by taking weekly meter readings and transmitting them to the RLDC.

SPECIAL ENERGY METER STORES STORES THE FOLLOWING DATA DURING THE 10 DAYS PERIOD (i)15 MIN. BLOCKWISE ACTIVE ENERGY FOR 10 DAYS (ii)15 MIN. BLOCKWISE AVERAGE FREQUENCY FOR 10 DAYS (iii)ALL CASES OF VT SUPPLY FAILURES (iv)ALL CASES OF METER TIME ADJUSTMENTS

SPECIAL ENERGY METER STORES (v)AT MIDNIGHT OF EVERY DAY THE FOLLOWING ADDITIONAL DATA IS LOGGED IN METERS MEMORY (1)SL. NO. OF METER (2)CUMULATIVE ACTIVE ENERGY REGISTER – C (3)HIGH VOLTAGE REACTIVE ENERGY REGISTER – H (4)LOW VOLTAGE REACTIVE ENERGY REGISTER – L (5) DATE

SPECIAL ENERGY METER DISPLAYS IN A CYCLIC MANNER ON PRESSING A PUSH BUTTON (i) LED CHECK (ii) METER SERIAL NO. (iii) DATE (iv) TIME (v) ACTIVE ENERGY IN LAST 15 MIN. BLOCK (vi) AVERAGE FREQUENCY IN LAST 15 MIN. BLOCK (vii) CUMULATIVE ACTIVE ENERGY REGISTER – C

SPECIAL ENERGY METER DISPLAYS (viii) HIGH VOLTAGE REACTIVE ENERGY REGISTER – H (ix)LOW VOLTAGE REACTIVE ENERGY REGISTER – L (x) INSTANTANEOUS AVERAGE VOLTAGE (xi)INSTANTANEOUS REACTIVE POWER

SPECIAL ENERGY METER DATA COLLECTION DATA COLLECTIVE DEVICE, A SMALL HAND HELD UNIT IS USED TO COLLECT DATA FROM SEM USING AN OPTICAL COUPLER CORD THE SAME DCD IS USED TO DUMP THE SEM DATA INTO A PC USING SERIAL PORT COMMUNICATION CORD WITH THE HELP OF A MANUFACTURER SUPPLIED SOFTWARE

Raw data WEEK FROM 0000 HRS OF TO 0837 HRS OF NP-0185-A NP-0185-A NP-0185-A

SPECIAL ENERGY METER DATA COLLECTION WITH THE SOFTWARE (USED FOR SML MAKE) 4 CODED FILES ARE FORMED IN A BINARY FORM IN THE PERSONAL COMPUTER NAMELY *.MRI *.RDG *.SUR *.AMR

SPECIAL ENERGY METER DATA COLLECTION WITH THE SOFTWARE (USED FOR L&T MAKE) 3 CODED FILES ARE FORMED IN A BINARY FORM IN THE PERSONAL COMPUTER NAMELY *.REF *.DCD *.DUP

SPECIAL ENERGY METER PRECAUTION FOR THE METER: SPECIAL ENERGY METER MAY BE PERIODICALLY CHECKED FOR THE LOW VOLTAGE L.E.D. INDICATION AS PER THE SPECIFICATION THE PUSH BUTTON DISPLAY ON THE FRONT PANEL MAY BE MADE USE OF, FOR PERIODICAL CHECKING OF VARIOUS PARAMETERS MEASURED OR COMPUTED BY THE METER

SPECIAL ENERGY METER PRECAUTION FOR THE DATA COLLECTING DEVICE (DCD) IT IS PREFERRED TO USE A FULLY CHARGED BATTERY WITH THE DCD BEFORE EVERY WEEKS DATA COLLECTION. A SPARE BATTERY AND BATTERY CHARGER ARE GIVEN WITH EACH DCD TO ENABLE RECHARGING OF USED BATTERY

SPECIAL ENERGY METER PRECAUTION IF BATTERY LOW INDICATION COMES DURING DATA COLLECTION, OLD BATTERY SHOULD NOT BE REMOVED FROM THE DCD UNTIL A NEW (FULLY CHARGED) BATTERY IS READY CLOSE BY FOR REPLACEMENT. DCD SHOULD BE IN OFF POSITION WHILE BATTERY REPLACEMENT IS MADE AND CHANGING BATTERY SHOULD BE COMPLETED IN 30 SECONDS OTHERWISE DATA WILL BE LOST. IT IS SUGGESTED TO USE SEMS MAINS ADAPTER TO POWER THE DCD WHILE THE BATTERY IS CHANGED WHICH MEANS THAT THE POWER SUPPLY TO DCD IS UNINTERRUPTED AND THERE IS NO HURRY TO FIT NEW BATTERY

SPECIAL ENERGY METER PRECAUTION FOR THE SEM DATA COLLECTION ALL THE METER DATA IS TO BE COLLECTED UNIFORMLY ON THE SAME DAY i.e. MONDAY AFTER 0030 HRS. IF THE LINE OR ICT TO WHICH THE SEM IS CONNECTED IS IN OPEN CONDITION AT THE TIME OF DATA COLLECTION (OLD SML MAKE), A VT SECONDARY SUPPLY OF 63.51V PHASE-NEUTRAL (SINGLE PHASE IS SUFFICIENT), FROM AN ADJACENT ICT OR LINE, IS TO BE EXTENDED TO THE METER FOR COLLECTING THE DATA STORED IN METERS MEMORY

SPECIAL ENERGY METER PRECAUTION FOR L&T MAKE METERS, BY PRESSING THE PUSH BUTTON WHICH WILL EXTEND SUPPLY TO THE MEMORY FOR COLLECTING THE DATA STORED IN METERS MEMORY. FOR SML MAKE NEW METERS, BY EXTENDING POWER THROUGH BATTERY CHARGER THE DATA STORED IN METERS MEMORY CAN BE COLLECTED.

SPECIAL ENERGY METER PRECAUTION FOR THE METER DATA: SEM DATA WHEN DUMPED INTO THE PERSONAL COMPUTER HAS TO BE SCANNED FIRST FOR DATA CORRECTNESS AND COMPLETENESS WHILE SCANNING, THE FOLLOWING ARE TO BE CHECKED MAINLY (I) 15 MIN. Whr. DATA FORMAT SHOULD BE XX.XX (WITH PROPER SIGN), ALL NUMERALS, COMPUTER VIRUS MAY CHANGE THIS FORMAT

SPECIAL ENERGY METER PRECAUTION (ii) 15 MIN. FREQUENCY DATA FORMAT SHOULD BE XX ALL NUMERALS (FROM 00 TO 99). COMPUTER VIRUS MAY CHANGE THIS FORMAT. (iiii) DATA SHOULD BE COMPLETE FOR 9 FULL DAYS AND PART FOR THE 10 TH DAY

SPECIAL ENERGY METER PRECAUTION (iv) STAR MARKS IN 15 MIN. TIME BLOCKS INDICATING LOW VOLTAGE I.E. AVERAGE VOLTAGE < 70% P.U. SHOULD BE CROSS CHECKED WITH CORRESPONDING VOLTAGE RECORDING IN THE S/S CONTROL ROOM (v) ANY TIME CORRECTIONS CARRIED OUT IN THE SEM SHOULD RELFECT IN THE RAW DATA AS ‘rr’ OR ‘aa’ IN SIX CONSECUTIVE 15 MIN. TIME BLOCKS STARTING FROM THE TIME OF CORRECTION.

No. Of Locations for Data Collection AGENCYLOCATIONS AP13 KARNATAKA12 KERALA6 TAMILNADU12 PONDYCHERRY3 GOA2 ISGS6 CTU22 TOTAL76

SPECIAL ENERGY METER DATA TRANSFER AFTER PRELIMINARY SCANNING OF RAW DATA, EACH SUB-STATION TRANSMITTS TO SRLDC ON DOT LINES STD /LOCAL INTERNET PUNCOM/HOTLINE ONCE IN A WEEK AT EARLY HOURS EVERY MONDAY Details

SPECIAL ENERGY METER DATA CHECK THE SOFTWARE IS USED FOR CHECKING THE SEM DATA RECEIVED FROM SUBSTATION FOR COMPLETENESS AND CORRECTNESS PRELIMINARY CHECKING OF DATA CORRECTNESS FOR SYNTAX CHECKING OF DATA FOR COMPLETENESS FOR THE DESIRED PERIOD OF ACCOUNTING SPLIT THE RAW DATA INTO A DATA BASE (DAYWISE & METERWISE)

SPECIAL ENERGY METER VARIOUS CHECKS FOLLOWING CHECKS ARE ALSO MADE TO PROVE DATA VALIDITY AND STRENGTH OF METER STORAGE CAPABILITY VOLTAGE PROBLEM FREQUENCY TIME CORRECTION WATTHOUR PROBLEM PREVIOUS WEEK DATA ALGEBRAIC SUM

SPECIAL ENERGY METER DATA COMPUTING AFTER OBTAINING SATISFACTORY RESULTS OF VARIOUS CHECKS, THE RAW DATA IN WHr IS CONVERTED INTO MWhr BY MULTIPLYING WITH RESPECTIVE METERS CT RATIO AND PT RATIO A PAIRS CHECK IS ALSO CARRIED OUT FOR THE METERS CONNECTED ON BOTH SIDE OF ICTS, LINES AND GT SIDE & LINE SIDE AT CGS

SPECIAL ENERGY METER DATA COMPUTING IN SUCH CASES WHEN A SET CONDITION IS NOT SATISFIED.AND. IF THE LOW VOLTAGE PROBLEM EXISTS.AND. IF THE MAGNITUDE OF MAIN METER IS LESS THAN THAT OF THE STANDBY METER FOR THE CORRESPONDING LINE BLOCK, THEN THIS PARTICULAR MAIN METERS ENERGY IS REPLACED BY CORRESPONDING VALUE OF CHECK METER THIS CHECK FACILITATES DETECTING OF MAL-FUNCTIONING/MIS-BEHAVIOUR OF METERS USED FOR ACCOUNTING

SPECIAL ENERGY METER ENERGY ACCOUNT USING THE COMPUTED DATA, SOME FICTITIOUS METERS ARE DEFINED, LIKE THE FOLLOWING, TO COMPUTE REGIONAL ENERGY ACCOUNTS I) TOTAL DRAWAL BY A CONSTITUENT AT A STATION II) TOTAL DRAWAL BY A CONSTITUTION IN THE REGION III) TOTAL INJECTION BY A CGS EX-BUS IV) PLOTTING LOAD CURVES/UTILITY CURVES FOR ANALYSIS AND LOAD MANAGEMENT

SPECIAL ENERGY METER ENERGY ACCOUNT (V) DAILY REACTIVE ENERGY DRAWAL BY CONSTITUENTS. USER CAN CREATE OUTPUT FILES AS DESIRED BY SUITABLY MODIFYING THE CONFIGURATION FILES (FICT METERS) IN THE PROGRAM

Computed Mwh data 230 kV Neyveli line at Pondicherry CTR = 600 PTR = 2091 PO-02 NP-0185-A …. ….. …..…..…

Active energy ENERGY ACCOUNTING USING SPECIAL ENERGY METER FOR TIME VILLIANUR BAHUR YANAM Net Drawal (Neyveli) (Neyveli) by PONDY in MWhr PO-02 PO-04 PO : : : : : : : : : : : : : : : : : : : : : : : : : …………………………………………………………………………………………………………… ………………………………………………………………………………………………………. 22: : : : : : : : TOTAL

Reactive energy accounting

REASEM–PROGRAM MENU REASEM–PROGRAM MENU A. INITIALISE DATA CORRECTNESS CREATE DATA BASE DATA RECEIVED DATA NOT RECEIVED VIEW RAW DATA B. VIEW VIEW WH DATA VIEW MWH DATA VIEW FICT DATA VIEW ANY FILE

REASEM–PROGRAM MENU C. CHECK 1. VOLTAGE PROBLEM 2. TIME CORRECTION 3. PREVIOUS WEEK DATA 4. FREQUENCY PROBLEM 5. WATT HOUR PROBLEM 6. ALGEBRAIC SUM 7. ALL CHECK D. COMPUTE 1. COMPUTE ENERGY 2. PAIR CHECK 3. GENERATION SCHEDULE 4. DRAWAL SCHEDULE 5. COMPUTER FICT MTRS.

REASEM–PROGRAM MENU E. ACCOUNT 1. MWH OUTPUT 2. MVARH OUTPUT 3. LOAD CURVE 4. UTILITY CURVE 5. TOTAL ENERGY 6. REG. ENERGY ACCOUNT F. HELP 1. ABOUT 2. SEM DATA 3. PROGRAMME BRIEF 4. CONFIG FILES 5. REGIONAL ACCOUNT 6. WARNINGS