- Special Energy Meters (SEM) in NR:
- Details of SEMs installed in NR are available at
Master File . MASTER file contains following SEM details.- Meter ID
- CT Ratio
- PT Ratio
- Type of Meter
- Location of Meter
- Details of SEMs installed in NR are available at
- Use Notepad to open raw Data, Processed and Entity wise SEM data files.
- Raw SEM data:
- As per IEGC 6.4.21 Encrypted SEM data from all concerned stations is sent to NRLDC every week by Tuesday for data validation and energy accounting.
- Encrypted SEM data is decoded at NRLDC using software’s provided by SEM vendors.
- Decoded SEM data at NRLDC end is used for Energy accounting and is available in text files.
- Decoded SEM data of all meters in NR is available at https://nrldc.in/commercial/sem-data/current-week/raw-data/
- Raw SEM data is uploaded in website every week by Friday after completion of energy accounting.
- Processed Data:
- Wh Raw SEM data is computed for actual values (in MWh) by applying multiplication factor. Multiplication Factor(M.F)= (CT Ratio x PT Ratio)/1000000
- Inputs for M.F is available Master File
- Weekly processed SEM data is uploaded in website every week by Friday
- Processed SEM data is available at Processed Sem Data.
- Each .rar file contains seven folders in the format of DDMMYY.
- Each folder contains processed SEM data of all meters for a particular day.
- Format of file name pertaining to a SEM meter is NPXXXXA.MWH/GJXXXXA. XXXX is four digit meter id.
- Each processed data file (NPXXXXA.MWH) contains data in 16 rows, each row contains data of 4 blocks(i.e 00:00 hrs to 24:00 hrs)
- Entity wise SEM data:
- Entity wise Injection/Drawal data is available at Net Injection of ISGS & BBMB & Net Drawal of States
- Each entity wise file contains
- Master frequency data(In 2 digit Frequency code format) Actual frequency = 49.5 + (Frq Code/100)
- SEM data of lines from which Injection/Drawal is computed
- Total Injection/Drawal of an entity
- Philosophy of Injection/Drawal Computation:
- The sign convention of power flow recorded by meters is positive for power flow out of bus-bar and negative for power flow into the bus-bar.
- Net injection/drawal at any location is algebraic sum of meters (including sign) on all feeders/ICTs/GTs listed with that location.
- Net drawal of State Utilities would be algebraic sum of drawals at all the locations listed for that utility.
- Discrepancy Report:
- Details of Discrepancies observed in SEM data during energy accounting is available at Discrepancy Report
- Weekly discrepancy report is uploaded in website every week by Friday.
- Discrepancy report consists of following details:
- Details of meters replaced with standby/check meters due to non availability of SEM data at NRLDC.
- Details of meters replaced with standby/check meters due to discrepancy/under recording of main meter.
- Details of adjustments done in main meter data due to discrepancy in few blocks.
- Details of Time drift in SEMs.